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Difference between hillshade generated with referenced mosaic dataset and 3D/Spatial Analyst tool

March 05 2011 | 0 comments
Categories: ArcGIS 10, ArcGIS Methods, Map Data

Working through the Arc10 raster tutorials and wonder what the difference is between a hillshade generated from a referenced mosaic dataset using the hillshade script and one generated via 3D/Spatial Analyst. Tutorial write up and help menu did not offer much explanation. Is the referenced mosaic like a layer file, in that without the underlying DEM the hillshaded layer would not exist? Can certainly see how this would minimize file size of a finished map document.

Thanks.

Mapping Center Answer:

First, we answered a similar queston once before here -- this is teh asnwer to that question:

http://mappingcenter.esri.com/index.cfm?fa=ask.answers&q=1703

Second, in specific answer to your question, yes - you can think of a mosaic data set IS a bit like a layer. If the source is deleted or moved and the reference to it is lost, then the data will not be displayed in ArcMap. Also, if the referenced mosic dataset is corrupted for some reason, even if the data are where they are supposed to be, then they will also not be displayed.  So this means taht if you are applying a hillshade function (which is dynamically applied), the DEM has to be correctly referenced for the hillshade to be displayed.

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