Is DN value and atmospheric reflectance in MODIS data is same? If not then what is the method to convert DN to atmospheric reflectance?

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Xianjun Hao

You can take a look at the following paper about how to apply scale factor and offset to convert L1B data in HDF file to TOA reflectance and radiance

https://ams.confex.com/ams/pdfpapers/28765.pdf

Muhammad Bilal [Ph.D]

You can use MODIS Conversion ToolKit (MCTK) to convert scale integers (SI) into TOA reflectance. You can download MCTK from here: https://github.com/dawhite/MCTK/releases

Regards,

Bilal