I'm new to ArcMap 10.2 and trying to get NDVI data of city centers.
So my problem is, after I'm calculating the NDVI and getting the result raster, I would like to get a mean (average) value of specifically and only the area I select (which is the city center on a 1:50000 scale).
Things I tried and didn't make me happy;
1) Identify tool. It constantly gives me the information about only ONE pixel even if I draw an area on raster image with shift + click. 2) Clipping raster from View > Data Frame Properties > Data Frame > Clipping tool. Even after I crop the satellite image to 1:50000 area I'm interested in, I can still get information from blank places OUTSIDE of my area, and it also affects the mean value of AOI NDVI.
So basically, I want to get an accurate mean NDVI value ONLY including the pixels of the selected area of interest.
I'm using LANDSAT 7 and 8 satellite images which are way larger than my AOI.
Sorry for bad English.