Geometric Validation of the PF-ASAR and InSAR Products Detlev Kosmann *, Jürgen Holzner *, Hannes Raggam * * , Dave Small ***, Martin Huber* * DLR, D-82230 Wessling, Germany * * Joanneum Research, A-8010 Graz, Austria *** Remote Sensing Lab.RSL, University of Zürich, CH-8057 Zürich, Switzerland

Verification Approach - Using Systemparameter (Orbit, SAR-Processor) - Ground Control Points - Corner Reflectors, Transponders - Product combination (SRTM)

Products for Verification Major Product Types for Validation ASA_IMS ASA_IMG ASA_APS ASA_APG ASA_IMM ASA_WSM ASA_GM

Methodology of Geocoding Calibration Procedure Product Input Format Control Visual Inspection Adjustment Geocoding GCP/ARC Measurement Error Analysis

Validation of IMG Products Assumptions: SAR Processor Version 3.0.3 ( December 2002) Predicted Orbit Doris Orbit FTP download from ESRIN PAC Products from UK and D Only Results from Processor V3.0.3 ASA_IMG_1PXPDE20021103_210513_000000152010_00487_03547_0001.N1 ASA_APG_1PXPDE20021109_211632_000000152011_00072_03633_0002.N1 ASA_IMG_1PXPDE20021018_094453_000000152010_00251_03311_0004.N1 ASA_IMS_1PXPDE20020711_095619_000000142007_00337_01894_0017.N1 (ASA_IMS_1PXPDE20021018_094453_000000152010_00251_03311_0004.N1) ! DORIS Orbits ! Past: Validation of more than 50 products

Ground Control Points 85 GCP Netherland 1 :50K National Datum

Reference Data-SRTM Terrain geocoded SRTM Amplitude X –Band data Horz. Accuracy: 4m

Reference Data-DLR DLR Precise Geocoded Image: ETC

Combination of Reference and IMG’s Red: SRTM Green: 3547 Blue: 3633

Detail

Shift: ETC-IMG leer

! Pixel spacing in IMS geometry (A~4m, R~8m) Product: IMS 337_01894_0017.N1 Initial Geometry: Ground control points : 24 A[pxl] R[pxl] --------------------------------------------------------------- Rms 6.7 3.6 Mean -3.5 -3.1 After Adjustment and Integration of GCPs: Ground control points : 74 A[pxl] R[pxl] --------------------------------------------------------------- Rms 4.61 1.09 Mean 0 0 ! Pixel spacing in IMS geometry (A~4m, R~8m)

Product IMG 3311 Shift: 17 Pixel 212.5 m

Results for IMG products Geometric accuracy with DORIS Orbits ~20m Temporal consistency is not stabile Product format check – ok Validation only in flat terrain Validation only in one quadrant of the globe

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Radiometry ASA_APM_1PXPDE20021106_211012 ( Saturation) ASA_WSM_1PXPDE20021123_221335_ql2 (Near-to-Farrange-Ramp)

Shift with/without Adjustment Geometric Adjustment Shift to SRTM Shift with/without Adjustment

ERS reference products Maps of testareas Geodetic parameter ERS reference products Terrain height (DEM) Position of ARC‘s

Required Location of Testareas coordinate combinations corner reflector sites receiving stations ascending/descending turning point Greenwich Equator > 5 configurations

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WP: „Verfication of input products (all modes): Acitivity Geometry InSAR Product format verification x - Visual product inspection x x Localisation accuracy x x Swath geometry x - Azimuth and ranging timing parameter x x Inter-channel coregistration x - Stripeline boundaries x - SWST - x Geocoding parameter x - Orbit analysis x x Optimization x x ? Temporal consistency ? x x ? Radiometric resampling effects ? x -