How to convert the MOD09 image DN to the Rrs data?

xiao_0.026 · by **xiao_0.026** » Mon Jun 24, 2019 9:46 pm America/New_York

In the nowtime. I use the MOD09 product to obtain the surface reflectance.

But when I open MOD09 image via the software ENVI5.3 and extract the image pixel data.
The pixel data is the very big.Just the follow,
a pixel data:[14060000.0000, 16850000.0000, 15760000.0000] in three band.
The data is out the “valid range[-100:16000]”.
And the “scale factor[10000.00000000]” is small.
How obtain the reflectance pixel data?
Or how to convert the DN to Rrs data?

gfireman · by **gfireman** » Mon Jul 29, 2019 11:14 am America/New_York

The Ocean Color group does not distribute or use the MOD09 reflectance product, so we are unable to advise you.
You might want to download the user guide from https://modis.gsfc.nasa.gov/data/dataprod/mod09.php .

gfireman · by **gfireman** » Mon Jul 29, 2019 11:17 am America/New_York

That download link doesn't seem to be working. Try the cached version at
https://webcache.googleusercontent.com/search?q=cache:6gSAMX11BakJ:https://landweb.modaps.eosdis.nasa.gov/QA_WWW/forPage/user_guide/MOD09_UserGuide_v1.4.pdf