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within arcgis, you can use the zonal statistics as table tool. This will give you a table with the ID of your buffer polygon and the statistics of the raster below. Make sure that you set the pixel size equal to your raster size in the environment setting, otherwise the internal conversion from polygon to raster could be too coarse.


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If your ultimate aim is to remove all of the islands and if the island polygons have the same attributes and assuming you are using ArcGIS then you can use the Dissolve tool and bypass the need to select them: QGIS has a tool also called dissolve which will also allow you to select and attribute field to base the dissolve on:


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If you have Qgis, you can ask gdalsrsinfo in the OSGeo4w shell: gdalsrsinfo "+proj=tmerc +lat_0=0 +lon_0=-114 +k=0.9999 +x_0=0 +y _0=0 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs" PROJ.4 : '+proj=tmerc +lat_0=0 +lon_0=-114 +k=0.9999 +x_0=0 +y_0=0 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs ' OGC WKT : PROJCS["unnamed", GEOGCS["GRS ...


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You could save your functions in a raster function template and apply this template to other rasters using the Edit Raster Function tool (Standard or Advance license needed).



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