I recently tried to create a hillshade of a valley in the Scottish Cairngorm mountains using some Digimap 5m elevation data (specifically the OS Terrain™ 5 DTM).

The data was downloaded in .asc format and I converted this to raster using the ArcToolbox Ascii -> Raster function. Then I mosaic'd the individual tiles together and used the hillshade tool to produce this: enter image description here

The view is approximately 10 miles across from left to right, should it be this fuzzy?

I'm very new to ArcMap and GIS in general.

  • I never realized the north slopes of hills in Scotland got so much sunlight. – Kirk Kuykendall Jun 24 '16 at 15:55
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    A 5m resolution is fairly coarse, from my experience. The hillshade looks correct to me. – Barbarossa Jun 24 '16 at 17:27
  • Perfectly normal hillshade. If you see some artefacts at a closer zoom, repeat import from ascii. Make sure to pick Float type – FelixIP Jun 24 '16 at 22:17

I had the same problem with a 10m DTM. Go to the Layer Properties -> Display -> Resample during display using: "Bilinear Interpolation"

Hillshade with Nearest Neighbor resampling

Hillshade with Bilinear Interpolation

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