CryoVEx08/09 Antarctica
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1 CryoVEx08/09 Antarctica Final presentation Veit Helm, AWI CryoVEx08/09 ANT FM, ESTEC 1/27
2 Overview Campaign overview Processing status Calibration Datation Data analysis Summary CryoVEx08/09 ANT FM, ESTEC 2/27
3 Key Objectives CryoSat CAL/VAL over Blue Ice in Dronning Maud Land: o Preliminary Cryosat ground tracks over Blue Ice o Validation lines of TU-Dresden o Repeat some profiles measured in 2007 o o o First time dense grid (20 km x 25 km, spacing 1 km) Runway calibration flights Corner Reflector over passes CryoVEx08/09 ANT FM, ESTEC 3/27
4 Airborne campaign overview Airborne activity: 21 th Dec th Jan Base station: Novo Airfield Hours of Operation: ~26h (0.5 Tb data collected) Platform: Polar5 (Basler BT-67) Participants: 3 AWI, 1 FILAX Instrumentation: ASIRAS Laserscanner (80 Hz, 45 swath) INS 2 Trimble GPS receivers (1 Hz) 2 Novatel GPS receivers (20 Hz) Laser Altimeter (LD90 4 Hz) CryoVEx08/09 ANT FM, ESTEC 4/27
5 POLAR 5 Parameter POLAR 5 length, height, width (m) 20,66 / 5,20 / 29,00 cabine: length, height, width (m) 12,85 / 2,00 / 2,34 max. payload (kg) 3900 fuel consumption (kg/h) 500 operating distance (km) 2900 (up to 10h) number of passengers 18 max. flying altitude (m) 7600 min./max. speed (km/h) 185/400 max. take off altitude (ski) (m) > CryoVEx08/09 ANT FM, ESTEC 5/27
6 Aircraft Instrumentation S. Hendricks, AWI CryoVEx08/09 ANT FM, ESTEC 6/27
7 Area of Investigation CryoVEx08/09 ANT FM, ESTEC 7/27
8 Area of Investigation Airborne: o o o o o o LAMA Mode CryoSat2 tracks GPS transect Grid (20 km x 25 km) Runway calibration flights Corner Reflector over passes CryoVEx08/09 ANT FM, ESTEC 8/27
9 Measured profiles CryoVEx08/09 ANT FM, ESTEC 9/27
10 Processing overview ASIRAS processed with ESA processor version ASIRAS_04_02 GPS and INS data processed ALS data calibrated and processed CryoVEx08/09 ANT FM, ESTEC 10/27
11 Calibration of the laser scanner CryoVEx08/09 ANT FM, ESTEC 11/27
12 Runway calibration ALS elevation model of runway at Novo Airbase CryoVEx08/09 ANT FM, ESTEC 12/27
13 Runway calibration Profile Time start Time stop Tshift [s] Mean [m] Median [m] Stddv [m] Remark A081225_ TSRA A081225_ OCOG A081225_ TSRA A081225_ OCOG CryoVEx08/09 ANT FM, ESTEC 13/27
14 Datation Methods to determine the datation error 1. Corner reflector analysis 2. Comparison with ALS elevation model CryoVEx08/09 ANT FM, ESTEC 14/27
![Datation - CR Best fit of simulated hyperbola to raw data CR Profile Closest approach [m] Time [Seconds](/docs-images/87/96046589/images/15-0.jpg "of day] Time shift [s] 08CY4U8 A081225_07 1.36 59952.81 0.")
15 Datation - CR Best fit of simulated hyperbola to raw data CR Profile Closest approach [m] Time [Seconds of day] Time shift [s] 08CY4U8 A081225_ CryoVEx08/09 ANT FM, ESTEC 15/27
16 Datation - ALS Comparison of ASIRAS and ALS elevation without time shift correction CryoVEx08/09 ANT FM, ESTEC 16/27
17 Calibration Summary AWI processed L1B product as requested by ESA (Processor version ASIRAS_04_02) Runway calibrations show not the same offset Offset is depending on retracker algorithm ASIRAS L1B data containes no datation errors Quality in general good but: ALS shows data loss, due to hardware problems CryoVEx08/09 ANT FM, ESTEC 17/27
18 Comparison of ASIRAS with ALS DEM ASIRAS Footprint Roughness (m) Median Mean Stddv CryoVEx08/09 ANT FM, ESTEC
19 Accuracy of ASIRAS and ALS Comparison of ASIRAS and ALS Comparison of two crossed ALS-DEMs Accuracy of ALS: +/ m Accuracy of ASIRAS: +/ m CryoVEx08/09 ANT FM, ESTEC 19/34
20 Comparison of ALS DEM with GPS CryoVEx08/09 ANT FM, ESTEC 20/34
21 Comparison of Laser DEM with GPS CryoVEx08/09 ANT FM, ESTEC 21/34
22 Comparison of ASIRAS with laser DEM CryoVEx08/09 ANT FM, ESTEC 22/34
23 CryoVEx08/09 ANT FM, ESTEC 23/27
24 Comparison of ASIRAS with GPS CryoVEx08/09 ANT FM, ESTEC 24/27
25 Cross point analysis of ASIRAS Grid Grid in Blue ice area in DML: Dimensions: 20 km x 25 km Line spacing: 1 km x 5 km CryoVEx08/09 ANT FM, ESTEC 25/27
26 Cross point analysis of ASIRAS CryoVEx08/09 ANT FM, ESTEC 26/27
27 Conclusions Campaign was successful and acquired data set is a good basis for coming CAL/VAL activities in this area Accuracy of ASIRAS is better then 10 cm over Blue Ice Small Snow patches in blue ice seem to be tranparent for ASIRAS Systematic underestimation of airborne radar altimeter elevation due to preferential sampling of blue ice Further activity necessary to get more info about the Radar penetration GPS reference grids are necessary for the validation of CryoSat Blue ice areas might be of interest as validation sites for other Satellite missions CryoVEx08/09 ANT FM, ESTEC 27/27
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