MODIS / S3 SYNERGY Surface Reflectance Data

Dear all,

My objective is to compare Surface Reflectance (SDR) data from SYNERGY (S3) and from MODIS (AQUA/TERRA).

The main problem is that when I open MODIS SDR products on SNAP (MOD09), the values range from 0 to billions… I would like to normalize these values to be able to compare these last with the one from S3. Eric Vermote (research scientist from NASA) studied that recently but it’s hard to understand his work because only few presentations are available on internet.

If someone already struggled with these values, it would be really helpful.

Thanks everyone,