ALOS-2/PALSAR-2 Calibration and Validation Results
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1 ALOS-2/PALSAR-2 Calibration and Validation Results Ver JAXA EORC & ALOS-2 Project Team 1
2 Content 1. Update of the calibration factor (CF) 2. Evaluation results for PALSAR-2 standard products after the software update 2
3 Version history of PALSAR-2 product processing software Version Release date Changes Mar-17 7:00 (UT) Jun-18 7:00 (UT) Updated range antenna patterns. Updated radiometric calibration parameters. Updated polarimetric calibration parameters. Updated radiometric calibration parameters for Stripmap 6- m full polarimetry mode (beam number 3 and 7). Fixed the radiometric calibration parameter for ScanSAR mode (28 MHz band width). Improved inter-scan amplitude correction of ScanSAR mode. 3
4 1. Update of calibration factors in version Calibration factors for Stripmap 6-m full-polarimetry and ScanSAR 28 MHz mode were updated. Stripmap 6-m full-polarimetry Calibration factors for beams FP6-3 and FP6-7 were lowered by 1 db based on the accumulated evaluation result. ScanSAR 28 MHz mode It was found that calibration factors were 3 db higher due to software error. The error was fixed from this version. ScanSAR 28 MHz is mainly used for observations over Japan. The other global regions are observed by using ScanSAR 14 MHz, and it is not affected by this issue.
5 PALSAR-2 radiometric calibration For L1.5 and L2.1 σ 0 = 10 log DN 2 + CF For L1.1 σ 0 = 10 log I 2 + Q 2 + CF A σ 0 : DN: CF and A: Backscattering coefficient (Sigma zero) [db] Digital number (= raw pixel value) Calibration factor [db]
6 Detailed information on calibration factors determined by JAXA CalVal observations ver. Jun. 5, 2018 Current version Product ordering time for AUIG-2 Sep. 11, 2014 ~ Sep. 28, 2016, 7:00 UT Sep. 28, 2016, 7:00 UT ~ Mar. 28, 2017, 7:00 UT Mar. 28, 2017, 7:00 UT ~ Jun. 5, 2018, 7:00 UT Jun. 5, 2018, 7:00 UT ~ Version of the processing software ~ Spotlight all Stripmap [3 m] U U U U FP FP CF [db] Stripmap [6 m] FP FP FP F Stripmap [10 m] F F ScanSAR [14 MHz] ScanSAR [28 MHz] W W the other A [db] all 32.0
7 2. Evaluation results for PALSAR-2 standard products after the software update Version of the PALSAR-2 product processing software: * (Products ordered after Jun. 5, 2018, 7:00 UT via AUIG-2) No anomaly is detected and good accuracy is maintained. * Version of the processing software can be found in the field No. 12 of file descriptor record (CEOS format). 7
8 Summary of evaluation results of ALOS-2 PALSAR-2 standard products [1/3] Ver Items Observation modes Results Number of data Requirements Geometric accuracy [m] Stripmap and Spotlight ScanSAR 6.38 m (L1.1) 6.73 m (L2.1) m (L1.1) m (L2.1) m 100 m Radiometric accuracy [db] Evaluation using corner reflectors Evaluation using images over Amazonian forests Stripmap and Spotlight Stripmap and Spotlight 0.48 db (1σ) (mean CF: db) 0.41 db (1σ) (mean γ 0 : db) scenes 1.0 db VV/HH amplitude ratio (σ=0.012) 1±0.047 Polarimetry VV/HH phase difference [ deg. ] Cross talk [db] Stripmap 6m (polarimetry) deg (σ=0.962) 5 deg db (σ=5.264) [HV/HH] db (σ=4.953) [VH/VV] db 8
9 Summary of evaluation results of ALOS-2 PALSAR-2 standard products [2/3] Ver Items Observation modes Results Number of data Requirements Spotlight Az (σ=0.078) Rg (σ=0.012) 5 Az x 1.1 Rg Stripmap 3m Az (σ=0.020) Rg (σ=0.018) 105 Az x 1.1 Rg Resolution [m] Stripmap 6m Az (σ=0.031) Rg (σ=0.028) 54 Az x 1.1 Rg Stripmap 10m Az (σ=0.067) Rg (σ=0.065) 41 Az x 1.1 Rg Sidelobe (db) PSLR All Az (σ=2.31) Rg (σ=0.51) db ISLR All (σ=1.73) db 9
10 Summary of evaluation results of ALOS-2 PALSAR-2 standard products [3/3] Ver Items Observation modes Results Number of data Requirements Stripmap 3m (U2) (HH) db (scene center) NESZ [db] Stripmap 6m (FP6-3~7) (HH) (HV) db (scene center) Stripmap 10m (F2) (HH) (HV) db (scene center) Ambiguity [db] Azimuth All db (ave. 20dB) 7 scenes db Range All Not visible 7 scenes db 10
11 Evaluation results of geometric accuracy Ver Differences between point target responses in SAR images and in situ GPS measurements Mode ΔX (west-east) [m] mean SD RMS (bias) ΔY (north-south) [m] mean SD RMS (bias) n Spotlight Stripmap 3 m (U2-6~9) Stripmap 6 m (FP6-3~7) Stripmap 10 m (F2-5~7) Timeseries plot of Stripmap 3 m ΔX (west-east) ΔY (north-south) Descending Ascending
12 Calibration Facter [db] Evaluation results of radiometric accuracy calibration factor (CR) [1/2] Software Ver (updated Jun. 5, 2018) Data: year 2014~ db±1 db 10m Stripmap 6m Full-pol 3m Stripmap Number of CR observations Ver Spotlight U2-6 U2-7 U2-8 U2-9 U3-10 U3-11 U3-12 U3-13 U3-14 FP6-3 FP6-4 FP6-5 FP6-6 FP6-7 F2-5 F2-6 F2-7 12
13 Evaluation results of radiometric accuracy calibration factor (CR) [2/2] Ver Mode Mean [db] SD [db] RMS to -83 db [db] n Spotlight U U U U FP FP FP FP FP F F F ALL
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