New answers tagged srtm
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To smooth the hillshade, I used the focal statistics tool (in spatial analyst) with a 5x5 moving window. This can be done more than once until you're happy with the results. But as @Francesco mentioned, the hillshade will look sort of grainy on the monitor at this scale in ArcGIS. A good work around is to export map as a high res image to see the details ...
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The best is to resample the raster and have hillshade models of different scales. 90m resolution of the whole US will shade correctly but when you view the whole image the resampling algorithm for viewing in the screen will/might cause pixellation. If you view at about 1:1 screen scale you should see a good hillshade.
Also hillshading does not work really ...
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