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:

\[ \sigma_0 = 10 \times log_{10}(DN) + CF_1 \]

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