I want to Calculate NDVI of my Surrounding Area using Landsat 8.
I have Calculated NDVI but it is rather a very big region.
Can NDVI be calculated for a small specified region or can I extract my desired region from calculated NDVI?
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you can define a rectangular region in the "environment" of any raster tool. Click on "Environment" (if you use the forms) or set it up using arcpy.env (if you are in Python). Then define the extent that you want (make sure you also ask for snapping the pixels to the input layer)
Yes, you can do this with ArcGIS Desktop by doing the following:
clip the raster with the area (shapefile,geojson,geopackage, etc.) you want and then calculate the NDVI