ALOS PALSAR 2 Global Forest Product


I would like any suggestions about this processing flow with the PALSAR Global Forest product:

  1. I`m converting HV data from DN to decibels.
  2. Then, with this product, I’m subtracting one year from the following (for example, 2021 from 2022) to obtain forest loss.

Is it right subtracting rasters in logaritmic scale, such those converted on decibels?

Thanks in advance!!!

Answer of the ALOS Research Project Secretariat (maybe it will help someone):

Regarding your inquiry, subtracting rasters after converting from digital number [DN] to backscatter value [decibels] is the correct procedure”.