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I am using Landsat Surface Reflectance Level-2 images. I have to convert the DNs to reflectance values. When I apply the formula provided in the Landsat8 User Handbook :

reflectance = Reflectance_MULT_Band*DN + Reflectance_ADD_Band

in the metadata file, Reflectance_MULT_Band = 2.0000E-05 and Reflectance_Add_Band= 0.1 The problem is I am getting negative values even after correction for the solar elevation angle.

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You already have surface reflectance, not DN.

You are trying to apply the level 1 TOA reflectance correction to already corrected level 2 data.

Just apply the scale factor of 0.0001 to convert the scaled integer values (0-10000) to floating point (0 - 1.0). i.e divide by 10000.0 or multiply by 0.0001. See "7.1 Surface Reflectance Specifications" in the Landsat 8 Surface Reflectance Product Guide.

  • Thank you so much for your help. I'm new this field and I have began to work on the projet for about a month. – tzebot Apr 26 '18 at 12:34

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