Solution to GF1 PMS sensor's radiation calibration error after the update of ENVI domestic satellite plug-in
On Double Eleven in 2020, the Resource Satellite Application Center released the calibration coefficients for domestic satellites in 2020: http://www.cresda.com/CN/Downloads/dbcs/15817.shtml and
then ENVI APP STORE updated the expansion of domestic satellites Tools:
However, after installing the latest version of the domestic satellite expansion tool, GF1 PMS will still report errors in radiation calibration. Everyone can take a closer look at the calibration coefficients of domestic satellites in 2020 to find the reason:
Although the Resource Satellite Application Center has released the calibration coefficients of domestic satellites in 2020, there are no GF1 PMS1 and GF1 PMS2 sensors, GF1 WF4 four sensors. And GF1 BCD does.
Then we need to open the installation path of the domestic satellite extension tool:
open the envi_gf_support file, and manually add the 2020 PMS calibration parameters according to the format in the TXT. As shown in the following figure, replace the 2020 PMS1 with the 2019 one. The 2020 PMS2 is replaced with the 2018 parameters:
After saving, use the domestic satellite plug-in to open the 2020 GF1 PMS data, the calibration will not report an error.
To make a digression, while we were still struggling with the calibration of domestic satellites, USGS has already released Landsat Collection2's L1 and L2 products. The L2 level of Landsat Collection2 is not like the L2 level of Landsat Collection1. Reservations need to be submitted. Landsat Collection2 The L2 level can be downloaded directly, eliminating the need for self-calibration and atmospheric correction.
Let’s take a look at ESA. The Sentinel 2 data of ESA has released L1C and L2A level data for a long time. Downloading L2A level data does not require calibration and atmospheric correction by yourself. ESA has also established an online browsing system, which can not only browse part of the sentinel series and Landsat data, but also freely switch the band combination and choose the bands that you want to participate in the normalized calculation:
our domestic data is still in terms of product release. Need to be more perfect.
That's it for today's introduction. Welcome everyone to visit the blog: https://blog.csdn.net/qq_46071146
