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  <xs:element id="oust_UnrecognizedTaxBenefitDecreaseAbstract" abstract="true" name="UnrecognizedTaxBenefitDecreaseAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="oust_EffectiveIncomeTaxRateReconciliationChangesInWarrantFairValueAmount" abstract="false" name="EffectiveIncomeTaxRateReconciliationChangesInWarrantFairValueAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_StockholdersEquityReclassificationOfNotesReceivableFromStockholder" abstract="false" name="StockholdersEquityReclassificationOfNotesReceivableFromStockholder" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_A2015StockPlanMember" abstract="true" name="A2015StockPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsVestedPercentage" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsVestedPercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="oust_ReverseRecapitalizationPreMergerCost" abstract="false" name="ReverseRecapitalizationPreMergerCost" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsEarlyExercisedUnvestedSharesOutstanding" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsEarlyExercisedUnvestedSharesOutstanding" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="oust_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAssumedInBusinessCombination" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAssumedInBusinessCombination" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="oust_NumeratorAbstract" abstract="true" name="NumeratorAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="oust_ClassOfWarrantOrRightRedemptionTermsThresholdTradingDayPeriod" abstract="false" name="ClassOfWarrantOrRightRedemptionTermsThresholdTradingDayPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="oust_LIBORRateNotAvailableOrApplicableMember" abstract="true" name="LIBORRateNotAvailableOrApplicableMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_ReverseRecapitalizationDeferredTransactionCost" abstract="false" name="ReverseRecapitalizationDeferredTransactionCost" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_SeriesBRedeemableConvertiblePreferredStockWarrantsMember" abstract="true" name="SeriesBRedeemableConvertiblePreferredStockWarrantsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_AmericasExcludingUnitedStatesMember" abstract="true" name="AmericasExcludingUnitedStatesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_IssuanceOfStockForServices" abstract="false" name="IssuanceOfStockForServices" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAssumedThroughAcquisition" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAssumedThroughAcquisition" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="oust_OperatingLeaseLiabilityAdjustment" abstract="false" name="OperatingLeaseLiabilityAdjustment" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_OperatingLossCarryforwardsExpirationPeriodsDomain" abstract="true" name="OperatingLossCarryforwardsExpirationPeriodsDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_ScheduleOfPrepaidExpensesAndOtherCurrentAssetsTableTextBlock" abstract="false" name="ScheduleOfPrepaidExpensesAndOtherCurrentAssetsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="oust_RedeemableConvertiblePreferredStockWarrantLiabilityMember" abstract="true" name="RedeemableConvertiblePreferredStockWarrantLiabilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_ShareBasedCompensationExpenseMember" abstract="true" name="ShareBasedCompensationExpenseMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_InTheEventOfDebtDefaultMember" abstract="true" name="InTheEventOfDebtDefaultMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_OusterTechnologiesIncMember" abstract="true" name="OusterTechnologiesIncMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_GrossProceedsFromReverseRecapitalizationTransaction" abstract="false" name="GrossProceedsFromReverseRecapitalizationTransaction" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_CLAWarrantsMember" abstract="true" name="CLAWarrantsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_WeightedAverageRemainingContractualTermAbstract" abstract="true" name="WeightedAverageRemainingContractualTermAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="oust_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnvestedExercisesInPeriod" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnvestedExercisesInPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="oust_ManagementAndEmployeeCertainExecutivesMember" abstract="true" name="ManagementAndEmployeeCertainExecutivesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_SeriesBPreferredStockConvertedToCommonStockMember" abstract="true" name="SeriesBPreferredStockConvertedToCommonStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_ReverseRecapitalizationOfferingCost" abstract="false" name="ReverseRecapitalizationOfferingCost" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_ProceedsFromReverseRecapitalizationTransaction" abstract="false" name="ProceedsFromReverseRecapitalizationTransaction" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_A2018ConvertiblePromissoryNoteMember" abstract="true" name="A2018ConvertiblePromissoryNoteMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfOptionsEarlyExercised" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfOptionsEarlyExercised" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="oust_TemporaryEquityDividendRatePerDollarAmount" abstract="false" name="TemporaryEquityDividendRatePerDollarAmount" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="oust_EquityAndTemporaryEquityTextBlock" abstract="false" name="EquityAndTemporaryEquityTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="oust_CustomerCMember" abstract="true" name="CustomerCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_SeveralMembersOfTheBoardOfDirectorsMember" abstract="true" name="SeveralMembersOfTheBoardOfDirectorsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAssumedThroughAcquisition" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAssumedThroughAcquisition" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="oust_PaymentOfReverseRecapitalizationOfferingCost" abstract="false" name="PaymentOfReverseRecapitalizationOfferingCost" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_ConversionOfCanceledCLAUnitsToOusterCommonStockMember" abstract="true" name="ConversionOfCanceledCLAUnitsToOusterCommonStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_ManagementAndEmployeeMember" abstract="true" name="ManagementAndEmployeeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_IssuanceOfRedeemableConvertiblePreferredStockUponExerciseOfWarrants" abstract="false" name="IssuanceOfRedeemableConvertiblePreferredStockUponExerciseOfWarrants" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_PromissoryNoteRecoursePercentage" abstract="false" name="PromissoryNoteRecoursePercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="oust_DeferredTransactionCostPolicyPolicyTextBlock" abstract="false" name="DeferredTransactionCostPolicyPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="oust_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodIntrinsicValue" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodIntrinsicValue" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_A350TreatBuildingLeaseMember" abstract="true" name="A350TreatBuildingLeaseMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_A274116thStreetLeaseMember" abstract="true" name="A274116thStreetLeaseMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_OperatingLeaseFixedLeaseExpense" abstract="false" name="OperatingLeaseFixedLeaseExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_CustomerDMember" abstract="true" name="CustomerDMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_PromissoryNotesForPurchaseOfCommonStockPolicyTextBlock" abstract="false" name="PromissoryNotesForPurchaseOfCommonStockPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="oust_SeriesBRedeemableConvertiblePreferredStockMember" abstract="true" name="SeriesBRedeemableConvertiblePreferredStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_SeriesSeedRedeemableConvertiblePreferredStockMember" abstract="true" name="SeriesSeedRedeemableConvertiblePreferredStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_AdjustmentsToAdditionalPaidInCapitalWarrantExercised" abstract="false" name="AdjustmentsToAdditionalPaidInCapitalWarrantExercised" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_ConvertiblePreferredStockConversionPrice" abstract="false" name="ConvertiblePreferredStockConversionPrice" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="oust_ClassOfWarrantOrRightRedemptionTermsThresholdCommonStockPrice" abstract="false" name="ClassOfWarrantOrRightRedemptionTermsThresholdCommonStockPrice" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="oust_InterestRateScenarioAxis" abstract="true" name="InterestRateScenarioAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="oust_PaymentOfInterestAndFeesUponExtinguishmentOfDebt" abstract="false" name="PaymentOfInterestAndFeesUponExtinguishmentOfDebt" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_DebtInstrumentConvertibleThresholdGrossProceedsFromSaleOfStockInTheEventOfQualifiedFinancing" abstract="false" name="DebtInstrumentConvertibleThresholdGrossProceedsFromSaleOfStockInTheEventOfQualifiedFinancing" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_ApplicableInterestRateAtTheTimeOfDefaultMember" abstract="true" name="ApplicableInterestRateAtTheTimeOfDefaultMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_ReverseRecapitalizationAndBusinessCombinationAbstract" abstract="true" name="ReverseRecapitalizationAndBusinessCombinationAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="oust_GainLossOnExtinguishmentOfTrancheRightLiability" abstract="false" name="GainLossOnExtinguishmentOfTrancheRightLiability" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_ExercisePriceRangeThreeMember" abstract="true" name="ExercisePriceRangeThreeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_DebtInstrumentMaximumBorrowingCapacity" abstract="false" name="DebtInstrumentMaximumBorrowingCapacity" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityExtinguishments" abstract="false" name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityExtinguishments" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_ColonnadeAcquisitionCorpMember" abstract="true" name="ColonnadeAcquisitionCorpMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_ThirdPartyContractManufacturerMember" abstract="true" name="ThirdPartyContractManufacturerMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_InterestRateScenarioDomain" abstract="true" name="InterestRateScenarioDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_PropertyPlantAndEquipmentWriteOffs" abstract="false" name="PropertyPlantAndEquipmentWriteOffs" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_BusinessCombinationConsiderationTransferredShareBasedCompensationRelatedToPreAcquisitionService" abstract="false" name="BusinessCombinationConsiderationTransferredShareBasedCompensationRelatedToPreAcquisitionService" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityAcquiredAsPartOfTheMerger" abstract="false" name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityAcquiredAsPartOfTheMerger" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_ShareBasedPaymentArrangementTrancheFiveMember" abstract="true" name="ShareBasedPaymentArrangementTrancheFiveMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_TemporaryEquityStockIssuedDuringPeriodSharesNewIssues" abstract="false" name="TemporaryEquityStockIssuedDuringPeriodSharesNewIssues" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="oust_WarrantIssued" abstract="false" name="WarrantIssued" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_LesseeOperatingLeaseLiabilityToBePaidYearFiveAndThereafter" abstract="false" name="LesseeOperatingLeaseLiabilityToBePaidYearFiveAndThereafter" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_ClassOfWarrantOrRightGainLossOnExpirationOfTrancheRight" abstract="false" name="ClassOfWarrantOrRightGainLossOnExpirationOfTrancheRight" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_StockIssuedDuringPeriodSharesReverseRecapitalization" abstract="false" name="StockIssuedDuringPeriodSharesReverseRecapitalization" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="oust_CashCashEquivalentsAndRestrictedCashUninsuredAmount" abstract="false" name="CashCashEquivalentsAndRestrictedCashUninsuredAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_BusinessCombinationConsiderationTransferredHoldbackSharesValue" abstract="false" name="BusinessCombinationConsiderationTransferredHoldbackSharesValue" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableCommonStockPriceToOptionExercisePriceThresholdPercentage" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableCommonStockPriceToOptionExercisePriceThresholdPercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="oust_AggregateIntrinsicValueRollForward" abstract="true" name="AggregateIntrinsicValueRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="oust_ShareBasedPaymentArrangementOptionAssumedThroughAcquisitionMember" abstract="true" name="ShareBasedPaymentArrangementOptionAssumedThroughAcquisitionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_SeriesARedeemableConvertiblePreferredStockWarrantsMember" abstract="true" name="SeriesARedeemableConvertiblePreferredStockWarrantsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndEarlyExercisedOptionsSubjectToNonrecourseNotesMember" abstract="true" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndEarlyExercisedOptionsSubjectToNonrecourseNotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_ExtinguishmentOfDerivativeLiabilityAmount" abstract="false" name="ExtinguishmentOfDerivativeLiabilityAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_DebtInstrumentConvertibleCalculationOfConversionPriceNumerator" abstract="false" name="DebtInstrumentConvertibleCalculationOfConversionPriceNumerator" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_EffectiveIncomeTaxRateReconciliationCancellationOfIndebtednessIncomeAmount" abstract="false" name="EffectiveIncomeTaxRateReconciliationCancellationOfIndebtednessIncomeAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_DeferredTaxAssetsOperatingLeaseLiability" abstract="false" name="DeferredTaxAssetsOperatingLeaseLiability" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_RedeemableConvertiblePreferredStockTrancheRightMember" abstract="true" name="RedeemableConvertiblePreferredStockTrancheRightMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_BusinessCombinationConsiderationTransferredHoldbackSharesReleaseTerm" abstract="false" name="BusinessCombinationConsiderationTransferredHoldbackSharesReleaseTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="oust_TemporaryEquityTextBlock" abstract="false" name="TemporaryEquityTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="oust_SensePhotonicsIncMember" abstract="true" name="SensePhotonicsIncMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_StockIssuedDuringPeriodSharesExerciseOfWarrants" abstract="false" name="StockIssuedDuringPeriodSharesExerciseOfWarrants" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="oust_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedExercisesInPeriod" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedExercisesInPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="oust_ExercisePriceRangeTwoMember" abstract="true" name="ExercisePriceRangeTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_ConvertiblePromissoryNoteMember" abstract="true" name="ConvertiblePromissoryNoteMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_ClassOfWarrantOrRightPolicyPolicyTextBlock" abstract="false" name="ClassOfWarrantOrRightPolicyPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="oust_OperatingLossCarryforwardsExpirationPeriodsAxis" abstract="true" name="OperatingLossCarryforwardsExpirationPeriodsAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="oust_OtherOperatingRealEstateLeasesMember" abstract="true" name="OtherOperatingRealEstateLeasesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_AdjustmentsToAdditionalPaidInCapitalConversionOfConvertibleDebt" abstract="false" name="AdjustmentsToAdditionalPaidInCapitalConversionOfConvertibleDebt" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedAndOtherCurrentLiabilities" abstract="false" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedAndOtherCurrentLiabilities" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageRemainingContractualTerm" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageRemainingContractualTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="oust_ClassOfWarrantOrRightConversionRatio" abstract="false" name="ClassOfWarrantOrRightConversionRatio" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="oust_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfCommonStockReceivedUponVestingOfEachPerformanceStockUnit" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfCommonStockReceivedUponVestingOfEachPerformanceStockUnit" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="oust_ShareBasedPaymentArrangementCompensationCostUponForgivenessOfPromissoryNotes" abstract="false" name="ShareBasedPaymentArrangementCompensationCostUponForgivenessOfPromissoryNotes" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_DebtInstrumentPaidInKindInterestRate" abstract="false" name="DebtInstrumentPaidInKindInterestRate" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="oust_ExercisePriceRangeSixMember" abstract="true" name="ExercisePriceRangeSixMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_ShareBasedPaymentArrangementMonthlyVestingForThirtySixMonthMember" abstract="true" name="ShareBasedPaymentArrangementMonthlyVestingForThirtySixMonthMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_OtherVendorsMember" abstract="true" name="OtherVendorsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_PromissoryNoteNonRecoursePercentage" abstract="false" name="PromissoryNoteNonRecoursePercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="oust_CommonStockVotingRightsNumberOfVotesPerShare" abstract="false" name="CommonStockVotingRightsNumberOfVotesPerShare" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="oust_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsCancellationsInPeriodIntrinsicValue" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsCancellationsInPeriodIntrinsicValue" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_WarrantsAcquiredInMerger" abstract="false" name="WarrantsAcquiredInMerger" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_ConversionOfWarrantToOusterCommonStockMember" abstract="true" name="ConversionOfWarrantToOusterCommonStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_AccruedAndOtherLiabilitiesCurrent" abstract="false" name="AccruedAndOtherLiabilitiesCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_ClassOfWarrantOrRightValueOfSecuritiesCalledByWarrantsOrRightsPercentageOfOutstandingLoan" abstract="false" name="ClassOfWarrantOrRightValueOfSecuritiesCalledByWarrantsOrRightsPercentageOfOutstandingLoan" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="oust_ShareBasedPaymentArrangementTrancheFourMember" abstract="true" name="ShareBasedPaymentArrangementTrancheFourMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_LesseeOperatingLeaseBaseLeasePaymentForExtendedLeaseTerm" abstract="false" name="LesseeOperatingLeaseBaseLeasePaymentForExtendedLeaseTerm" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_A2019ConvertiblePromissoryNoteMember" abstract="true" name="A2019ConvertiblePromissoryNoteMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_OperatingLossCarryforwardsExpirationYearUnlimitedMember" abstract="true" name="OperatingLossCarryforwardsExpirationYearUnlimitedMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnvestedEarlyExercisedCommonStockOptionsMember" abstract="true" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnvestedEarlyExercisedCommonStockOptionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAssumedThroughAcquisitionIntrinsicValue" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAssumedThroughAcquisitionIntrinsicValue" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_NoteReceivableRelatedPartiesPercentageForgiven" abstract="false" name="NoteReceivableRelatedPartiesPercentageForgiven" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="oust_PrivatePlacementWarrantsMember" abstract="true" name="PrivatePlacementWarrantsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_ShareBasedPaymentArrangement10ShareholderMember" abstract="true" name="ShareBasedPaymentArrangement10ShareholderMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_ShareBasedCompensationArrangementByShareBasedPaymentAwardUnvestedRestrictedStockAwardMember" abstract="true" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardUnvestedRestrictedStockAwardMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_BusinessCombinationConsiderationTransferredHoldbackShares" abstract="false" name="BusinessCombinationConsiderationTransferredHoldbackShares" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="oust_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPercentageOfStockUnits" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPercentageOfStockUnits" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="oust_DeferredIncomeTaxExpenseBenefitValuationAllowance" abstract="false" name="DeferredIncomeTaxExpenseBenefitValuationAllowance" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_A2021IncentiveAwardPlanMember" abstract="true" name="A2021IncentiveAwardPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_ShareBasedCompensationArrangementByShareBasedPaymentAwardIncreaseInNumberOfSharesAuthorizedAnnualIncreasePercentage" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardIncreaseInNumberOfSharesAuthorizedAnnualIncreasePercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="oust_LesseeOperatingLeaseIncreaseInBaseLeasePayment" abstract="false" name="LesseeOperatingLeaseIncreaseInBaseLeasePayment" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsStockPriceIncreasePercentage" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsStockPriceIncreasePercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="oust_ExercisePriceRangeFourMember" abstract="true" name="ExercisePriceRangeFourMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAssumedThroughAcquisitionWeightedAverageGrantDateFairValue" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAssumedThroughAcquisitionWeightedAverageGrantDateFairValue" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="oust_ScheduleOfAccruedAndOtherCurrentLiabilitiesTableTextBlock" abstract="false" name="ScheduleOfAccruedAndOtherCurrentLiabilitiesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="oust_SaleOfWarrantPricePerShare" abstract="false" name="SaleOfWarrantPricePerShare" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="oust_ConversionOfCanceledCLAUnitsToPublicWarrantMember" abstract="true" name="ConversionOfCanceledCLAUnitsToPublicWarrantMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_PromissoryNoteMember" abstract="true" name="PromissoryNoteMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_IssuanceOfCommonStockOnExerciseOfStockOptionsWithNotesReceivableFromStockholders" abstract="false" name="IssuanceOfCommonStockOnExerciseOfStockOptionsWithNotesReceivableFromStockholders" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_CashCashEquivalentsAndRestrictedCashFDICInsuredAmount" abstract="false" name="CashCashEquivalentsAndRestrictedCashFDICInsuredAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_DebtInstrumentConvertibleThresholdGrossProceedsFromSaleOfStockInTheEventOfNonQualifiedFinancing" abstract="false" name="DebtInstrumentConvertibleThresholdGrossProceedsFromSaleOfStockInTheEventOfNonQualifiedFinancing" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_ShareholderOwnershipPercentage" abstract="false" name="ShareholderOwnershipPercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="oust_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAssumedThroughAcquisitionWeightedAverageGrantDateFairValue" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAssumedThroughAcquisitionWeightedAverageGrantDateFairValue" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="oust_FairValueAdjustmentToIntangibleAssetsMember" abstract="true" name="FairValueAdjustmentToIntangibleAssetsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_StockConvertedReversedRecapitalization" abstract="false" name="StockConvertedReversedRecapitalization" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="oust_UninvoicedReceiptsOtherCurrentLiabilities" abstract="false" name="UninvoicedReceiptsOtherCurrentLiabilities" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_TransactionCostsIncurredButNotYetPaid" abstract="false" name="TransactionCostsIncurredButNotYetPaid" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_ConvertiblePreferredStockTermsOfConversionThresholdGrossCashProceeds" abstract="false" name="ConvertiblePreferredStockTermsOfConversionThresholdGrossCashProceeds" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_SeriesARedeemableConvertiblePreferredStockMember" abstract="true" name="SeriesARedeemableConvertiblePreferredStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_DebtInstrumentRepaymentOfDebtOnLendersRequestPercentageOfOutstandingPrincipalHeldByLender" abstract="false" name="DebtInstrumentRepaymentOfDebtOnLendersRequestPercentageOfOutstandingPrincipalHeldByLender" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="oust_LesseeOperatingLeaseScheduleOfWeightedAverageRemainingLeaseTermAndDiscountRateTableTextBlock" abstract="false" name="LesseeOperatingLeaseScheduleOfWeightedAverageRemainingLeaseTermAndDiscountRateTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="oust_ShareBasedCompensationArrangementByShareBasedPaymentAwardMinimumExercisePriceAsPercentageOfFairValueOfSharesOnGrantDate" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardMinimumExercisePriceAsPercentageOfFairValueOfSharesOnGrantDate" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="oust_ConversionOfClassBCommonStockToClassACommonStockMember" abstract="true" name="ConversionOfClassBCommonStockToClassACommonStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableThresholdNumberOfConsecutiveTradingDays" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableThresholdNumberOfConsecutiveTradingDays" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="oust_ReverseRecapitalizationPolicyTextBlock" abstract="false" name="ReverseRecapitalizationPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="oust_CustomerAMember" abstract="true" name="CustomerAMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_StockholdersEquityIssuanceOfNotesReceivablesToShareholder" abstract="false" name="StockholdersEquityIssuanceOfNotesReceivablesToShareholder" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_ClassOfWarrantOrRightExercisableThresholdPeriod" abstract="false" name="ClassOfWarrantOrRightExercisableThresholdPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="oust_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAssumedThroughAcquisitionWeightedAverageRemainingContractualTerm" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAssumedThroughAcquisitionWeightedAverageRemainingContractualTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="oust_TemporaryEquityConversionOfTemporaryEquityToCommonStockShares" abstract="false" name="TemporaryEquityConversionOfTemporaryEquityToCommonStockShares" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="oust_OperatingLeaseNumberOfLeaseAgreements" abstract="false" name="OperatingLeaseNumberOfLeaseAgreements" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="oust_DebtInstrumentRepaymentOfDebtOnLendersRequestNoticePeriod" abstract="false" name="DebtInstrumentRepaymentOfDebtOnLendersRequestNoticePeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="oust_ConvertiblePreferredStockTermsOfConversionCommonStockPriceTrigger" abstract="false" name="ConvertiblePreferredStockTermsOfConversionCommonStockPriceTrigger" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="oust_ClassOfWarrantOrRightRedemptionTermsThresholdTradingDays" abstract="false" name="ClassOfWarrantOrRightRedemptionTermsThresholdTradingDays" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="oust_TemporaryEquityPolicyTextBlock" abstract="false" name="TemporaryEquityPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="oust_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOptionsToPurchaseCommonStockMember" abstract="true" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOptionsToPurchaseCommonStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_RecapitalizationTransactionConversionRatio" abstract="false" name="RecapitalizationTransactionConversionRatio" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="oust_OneSeniorAdvisorMember" abstract="true" name="OneSeniorAdvisorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_ProceedsFromStockOptionsExercisedAndPurchaseOfShares" abstract="false" name="ProceedsFromStockOptionsExercisedAndPurchaseOfShares" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_ExercisePriceRangeOneMember" abstract="true" name="ExercisePriceRangeOneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
