In the last years, the TanDEM-X mission systematically acquired data to create another global DEM, the so-called 'TanDEM-X DEM 2020', mainly between September 2017 and mid-2020. This contribution describes the status of the generation of this second global TanDEM-X DEM with special focus on procedural and algorithmic modifications compared to the first global TanDEM-X DEM

Bachmann, Markus

Buckreuss, Stefan

Huber, Martin

Lachaise, Marie

Schweißhelm, Barbara

Wessel, Birgit

Institute of Transport Research:Publications

Birgit Wessel1, Martin Huber1, Barbara Schweisshelm2, Markus Bachmann3, Marie Lachaise2, Stefan Buckreuss3TanDEM-X DEM 2020: What is new?1Martin Huber, DFD-DLR, 18.10.20231 German Aerospace Center (DLR), German Remote Sensing Data Center, Oberpfaffenhofen, Germany2 German Aerospace Center (DLR), Remote Sensing Technology, Oberpfaffenhofen, Germany3 German Aerospace Center (DLR), Microwaves and Radar Institute, Oberpfaffenhofen, GermanyTanDEM-X DEMs and value-added products2Martin Huber, DLR-DFD, 18.10.2023DEM productsValue-addedDEM productsValue-addedproductsTanDEM-X Forest/Non-Forest MapGUF® - Global Urban Footprint® v1World Settlement Footprint (WSF) 3D- Global, 90mTanDEM-X Coastline HydroSHEDS https://geoservice.dlr.de/web/mapsTanDEM-X 30m DEM Change MapsTanDEM-X DEM TanDEM-X DEM 2020TanDEM-X PolarDEM 90m of AntarcticaTanDEM-X 30m Edited DEMAcquisitions from 2010-2014 Acquisitions from 2017-2021 (mainly)What is new in TanDEM-X DEM Acquisition and Processing?3Martin Huber, DLR-DFD, 18.10.2023zIntegrated TanDEM-X Processor (ITP)Mosaicking and calibration processor (MCP)Acquisition PlanningRadar data Interferogram Raw DEMCalibration Final DEM• Reduction to 1 coverage,  only 2 coverages in difficult areas (red: mountains)• Acquisitions on same season (blue) or with specific parameters (green, forest)4Martin Huber, DLR-DFD, 18.10.2023▪ Usage of edited DEM▪ Delta-phase (also called differentential phase e.g. in PSI)▪ Better filtering (depending on the scene content)▪ Pre-calibratrion to TanDEM-XSAR focusingSpectral FilteringMaster Channel Instrument DataSAR dataCalibrationPulsesSynchronisationPulsesSlave → MasterSlave Channel Instrument DataSAR dataCalibration PulsesSynchronisationPulsesMaster → SlaveSAR focusingMonostaticChirp ReplicaBistatic Chirp ReplicaCal-Pulse ProcessingSync-Pulse ProcessingOscillator SynchronisationPhaseMaster SSC Slave SSCCoregistration and ResamplingRadargrammetricShiftsDual Baseline Phase Unwrapping Absolute Phase OffsetInterferogram GenerationGeocodingRaw DEMCoSSCAdditional CoverageCoSSC(s)SAR focusingSpectral FilteringMaster Chan el Instrument DatSAR datCalibrationPulsesSynchronisationPulsesSlave → MasterSlave Chan el Instrument DatSAR datCalibration PulsesSynchronisationPulsesMaster → SlaveSAR focusingMonostaticChirp ReplicaBistatic Chirp ReplicaCal-Pulse ProcessingSync-Pulse ProcessingOscillator SynchronisationPhaseMaster S C Slave S CCoregistration and ResamplingRadargram etricShiftsDual Baseline Phase Unwrap ing Absolute Phase OffsetInterferogram GenerationGeocodingRaw DEMCoS CAd itional CoverageCoS C(s)Edited TanDEM-X DEMs .(delta-phase)SAR focusingSpectral FilteringMaster Channel I strument Da aSAR dataCalibr tionPulseSynchronisationPulseSlave → MasterSlave Channel I strument Da aSAR dataCalibr tion PulseSynchronisationPulseMaster → SlaveSAR focusingMon staticChirp Re licaBistat c Chirp Re licaCal-Pulse ProcessingSync-Pulse ProcessingOscillator SynchronisationPhaseMaster SSC Slave SSCCoregistra ion and ResamplingRad rgr mmetricShiftsDual B seline Phase Unwrapping Absolute Phase OffsetInterf ogram Gen rationGeoc dingRaw DEMCoSSCAdditional CoveragCoSSC(s)and calibrationDeltaInSAR processing for TanDEM-X DEM 2020:from dual- to delta-ph se unwrapping5Martin Huber, DLR-DFD, 18.10.20236Martin Huber, DLR-DFD, 18.10.2023Pre-view on TanDEM-X DEM 2020 qualityInfrastructureCryosphereForestMining in Chile8Martin Huber, DLR-DFD, 18.10.2023Change Raw DEM, May 2019Change Raw DEM – COP DEM(90m scale)CRAW – COPDEM30m scaleTanDEM-X DEM (2010-2014)(23,5° S, 69,5° W)Mining in Chile9Martin Huber, DLR-DFD, 18.10.2023Global TanDEM-X DEM (2010-2014)(23,5° S, 69,5° W)Mining in Chile10Martin Huber, DLR-DFD, 18.10.2023(23,5° S, 69,5° W) Change RAW DEM scene (2019-05-10)Mining in Chile11Martin Huber, DLR-DFD, 18.10.2023(23,5° S, 69,5° W) Change RAW DEM scene (2019-05-10)Mean height error (comp. to ICESat): -0.19mMean height accuracy: +/-1.13 m => Same absolute height accuracy as for theglobal TanDEM-X DEMForest height accuracy & change 2018 – 2012Tallinn, Estonia (Project IKEBANA)12Martin Huber, DLR-DFD, 18.10.2023   TanDEM-XChange RawDEM 2018Accuracy of TanDEM-X heights (2018) versus LiDARWith different penetration bias approachesCanopy height change 2018 – 2012Tallinn, Estonia (Project IKEBANA)13Martin Huber, DLR-DFD, 18.10.2023Paper „Assessment of TanDEM-X DEM 2020 data on temperate forests and its application to canopy height change“ Schlund, Poncét, Wessel, Schweisshelm, Kiefl, PFG, 2023Forest lossForest growthStable Forest Canopy height change 2018 – 2012Tallinn, Estonia (Project IKEBANA)14Martin Huber, DLR-DFD, 18.10.2023Paper „Assessment of TanDEM-X DEM 2020 data on temperate forests and its application to canopy height change“ Schlund, Poncét, Wessel, Schweisshelm, Kiefl, PFG, 2023Forest lossForest growthStable Forest TanDEM-Xheight changeLiDARheight changeCanopy height change 2018 – 2012Tallinn, Estonia (Project IKEBANA)15Martin Huber, DLR-DFD, 18.10.2023Paper „Assessment of TanDEM-X DEM 2020 data on temperate forests and its application to canopy height change“ Schlund, Poncét, Wessel, Schweisshelm, Kiefl, PFG, 2023Forest lossForest growthStable Forest TanDEM-X changes on glaciers16Martin Huber, DLR-DFD, 18.10.2023 Mosaic of TanDEM-X DEM 2020 data over GreenlandN76W062Birgit Wessel, DFD-DLR, 20.07.2023TanDEM-X changes on glaciers17Martin Huber, DLR-DFD, 18.10.2023 Height decrease more than 5mHeight Difference of 2016/17 minus 2010/11 in GreenlandmmincreasedecreaseTanDEM-X PolarDEM Framework18Martin Huber, DLR-DFD, 18.10.2023Different DEM products for polar regions(north/south 60°)• TanDEM-X PolarDEM 90m of Antarctica• TanDEM-X PolarDEM 32m of the Arctic• Greenland (Download in prep. in 32m)• Rest Arctic successively 2023/2024• TanDEM-X Antarctic Peninsula DEM 12m• Penetration depth corrections (ongoing)• Time Tagged TanDEM-X PolarDEM 90m Greenland• Winter 2010 / 2011 (finished)• Winter 2016 / 2017 (finished)➢ available in 90m UPS at https://download.geoservice.dlr.de/TDM_POLARDEM90/ANTARCTICA/ ➢ available soon in 32m19Martin Huber, DLR-DFD, 18.10.2023Pre-view on TanDEM-X DEM 2020 qualityN me des Vortragenden, Institut, DatumStrength▪ Very good relative and absolute height accuracy, esp. over flat terrain▪ Independent DEM covering period from 2017 to 2021 mainly▪ Less prone to phase unwrapping errors due to support of editedDEMWeaknesses▪ Mountains: Only one orbit geometriy (ASC or DESC) lead touncomplete and/or errorneous height data in heights (less reliable than TanDEM-X DEM)▪ Some errors in the reference DEM will lead to artefacts in the newunwrapped DEM▪ Others: similar to TanDEM-X DEM, e.g. pu errors in forests, layoverin mountains, absolute height of islands, …)▪ Penetration biasSummary, cont.20Martin Huber, DLR-DFD, 18.10.2023▪ Production of the input Change RawDEM scenes –done (CoSSC’s are available)▪ TanDEM-X DEM 2020 calibration and mosaicking –mid 2024 complete product release▪ The orig. TanDEM-X DEM and the TanDEM-X DEM 2020 will have comparable quality▪ This additional dataset will allow monitoring topographic changes in comparison to the TanDEM-X DEM (change maps, change indication maps)▪ Potential for 3D changeTanDEM-X DEM (2010-2014)TanDEM-X DEM 2020 (2017-2021)Iceland: changes on glaciers21Martin Huber, DLR-DFD, 18.10.2023Bárðarbunga volcano, IcelandTanDEM-X DEM 2020 mosaic minus TanDEM-X DEM/Copernicus DEM

TanDEM-X DEM 2020: What is new?

https://elib.dlr.de/199238/1/TSXTDM2023-Huber_TanDEM-X-DEM2020.pdf

TanDEM-X DEM 2020: What is new?

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