Can I use NDVI of image pixels instead of normalization for training ANN?

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Rafael Garcia Rodriguez

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.

Watinee Thavorntam

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

Isam Ahmed Basheir

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