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Thanks Chris, that was helpful. I am not familiar with Python but I tried Modelbuilder and got an execution error. I am sure it's a problem with my data format or something else. I tried exporting my shapefiles to a feature class. I checked all the coordinate systems. I will keep trying. On the side note, still continuing with 30 different polygons. But I would still like to learn.
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04-23-2018
01:37 PM
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Ok, I think the issue was that I was using a tiff file for raster data, which did not work but the actual NDVI raster layer works. But, even after the successful zonal statistics, I still have only 1 row in the table, instead of 30 rows showing me values of each polygon distinctively. (Also, I noticed when I export NDVI raster to a .tif format using export data, the values of NDVI somehow change, I don't know why)
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04-23-2018
08:26 AM
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I tried running both, but I end up getting an empty raster as output. I added my shapefile in input feature data and NDVI layer for input value raster. I wonder what is it that I am doing wrong here.
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04-20-2018
07:23 AM
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I have a geotiff 16 bit multispectral data which converted to NDVI. Now I have about 30 polygons which are basically buffer strips on a stream and I want average, minimum and maximum NDVI value for each polygon. I used extract by mask tool and it works fine if I have a single polygon. It does not have an attribute table but I can still identify these values by changing the symbology to unique values. However, when I use a shapefile that has 30 different polygons, what I get is a data which shows me the mean, median, minimum and maximum of all the unique values of 30 polygons combined. What I want is 30 different numbers. The only way I know as of now is drawing 30 different shapefiles and then extracting each of them separately. Can someone suggest me a good way of doing this?
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04-19-2018
04:11 PM
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