hello all.
I created an NDVI raster based on images I downloaded from the Planet satellite. then, I created the raster using the Raster Calculator tool on ArcMap, and then reclassified in order to create a vegetation/non vegetation raster. I used the known values of NDVI>0.1/0.15/0.2 as vegetation and everything below as non-vegetation, but non of them included areas where I know for fact that there is vegetation. only when I reclassified vegetation as NDVI>(-0.05) those areas were marked as vegetation.
any suggestions to why that happens and how to fix it so that I could use this analysis in my research (with proper references for the NDVI values)?
thanks.
thank you so much for your response, Nasir.
I actually know these values and what they mean, and as you suggested, i used the original image in order to check if the NDVI values match the image. but for some reason I get values of -0.05 in areas of dense forest and I don't understand why or how to fix it.
Naama Rahamim, I am not sure which satellite images you used for NDVI. Normally, NDVI less than 0.2 is considered as Barren land. -0.05 is too low; it seems to be a water body. For fix the problem, you could denoise the images (e.g. atmospheric corrections) or recheck the spatial images that you used in NDVI image generation.
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