Can we use RGB of image pixels to get NDVI (reference if available)?
NDVI = Normalized Difference Vegetation Index
RGB = Red Green Blue of an image.
Dear Isam,
About your second question: NDVI requires both Red and Near Infrared bands. If you don´t have a NIR band there are other VI based only in visible bands, f.e. GRVI (Green-Red Vegetation Index), see: http://www.mdpi.com/2072-4292/2/10/2369.
Hope it helps,
Rafael.
Dear Isam,
Vegetation indices such as NDVI and EVI data can also be obtained from Terra MODIS vegetation indices (VIs) product (MOD13Q1). The spatial resolution for NDVI and EVI was 250 m and the compositing period is 16 day. You can go to the Reverb website http://reverb.echo.nasa.gov to download the images.
Regards,
Watinee
Could you be please to tell me the next process is correct or not.
I use GIS ARC 9.0 to export tiff image to RGB and then use the index (GNDVI) which is (G-R)/(G+R). I found this index in one of a research papers. Do you think i can go ahead.
Thanks in advance.
Best regards
Isam
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