Earthdata Forum

Hello, I downloaded MOD09GA in HDF format. Does it need preprocessing? If yes, what kind of processing should I perform?

Hello,
That is up to what you would like, it does not need preprocessing, it is atmospherically corrected. However, it is available in our AppEEARS tool which can perform many tasks such as subsetting by area and band, it can also reproject and reformat if you would like: https://appeears.earthdatacloud.nasa.gov/
Please let me know if you have any questions.
Thanks,
Brett

Thanks for your response. is there any way to convert it to GeoTIFF in python?

Hello, we are working on updating our resources but we have an older script for converting VIIRS HDF data to GeoTIFF that might help you get started on creating your own script to do the same for MODIS that can be found here: https://git.earthdata.nasa.gov/projects/LPDUR/repos/nasa-viirs/browse/scripts Please note as it has not been updated since May of 2020, some links might break.

Our developers will follow up on this post if they have any additional advice. We also leave this open to the community in case any users have suggestions.

1. Read MOD09GA using https://hdfeos.org/zoo/LPDAAC/MOD09GA.A2007268.h10v08.061.2021074090204.hdf.py example.

2. Write GeoTIFF using https://www.hdfeos.org/zoo/MORE/GESDISC/OMI/OMI-Aura_L2-OMAERUV_2019m0801t0453-o80020_v003-2019m0802t194820.SUB.he5.py example.

Please contact eoshelp@hdfgroup.org if you need further assistance.