I have a problem with calculating vegetation indices like EVI, GSAVI, SAVI on landsat7 images after i done a Brovey Transform, Modified Resolution Merge and HCS transformation in Erdas 2013. My study is based on comparing vegetation indices before and after pansharpening. I didn't have any problems with calculating vegetation indices before pansharpening.For calculating vegetation indices after pansharpening I first did TOA, and then with those images i performed pansharpening and then realised i need NIR band for calculating vegetation indices and in pansharpened images i only have R,G,B band. What can I do? I would be so grateful for any guidance 
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