I digitized some maps with isolines every 4m. I created a DEM and the Hillshade. But the hillshade has big pixels. I use ArcGIS 10.3.
Is there something to be look out for that I might have done wrong?
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The Hillshade tool inherits cell sizes from the raster layer it is based on. If you are able to recreate this DEM using a smaller cell size, the resulting hillshade should also have smaller cells.