[R-sig-Geo] MODIS data NDVI values

[pecardoso]

Hi.
MOD13A1 uses a scaling factor = 10000. To get the [-1, 1] range just divide
the raster by 10000. The same apply to EVI vegetation index.
It is described elsewhere but a brief explanation can be found  here
<http://nrm.salrm.uaf.edu/~dverbyla/MODIS_Land_Products/pdf_documents/users_guides/mod13_veg_indices-16_day_500m.pdf>  

All the best!



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