ALOS-2
Calibration
ALOS-2 L1.5 product digital number in the PALSAR-2 JAXA standard product is converted to backscattering coefficient (sigma naught in dB) using the following equation:
where \(CF_1\)=-83dB.
Input
The input is an ingested ALOS-2 PALSAR L1.5 product, see details here.
Output
The output is a STAC item geojson including the assets of product image files of each polarization in COG format.
Reference documents
[RD01] - JAXA, "ALOS-2 Level 1.1/1.5/2.1/3.1 GeoTIFF Product Format Description
[RD02] - JAXA, "ALOS-2 Level 1.1/1.5/2.1/3.1 CEOS Product Format Description"
[RD03] - M. Shimada, O. Isoguchi, T. Tadono and K. Isono, "PALSAR Radiometric and Geometric Calibration," in IEEE Transactions on Geoscience and Remote Sensing, vol. 47, no. 12, pp. 3915-3932, Dec. 2009, doi: 10.1109/TGRS.2009.2023909.
Reference websites
[RW01] - https://www.eorc.jaxa.jp/ALOS-2/en/calval/calval_index.htm
[RW02] - https://www.eorc.jaxa.jp/ALOS-2/en/calval/CalibrationFactors_PALSAR2_v201808.pdf