Merging GRID files in ArcMap
This procedure outlines steps to merge Digital Elevation Model data into a single file using ArcMap 9.1. The following steps assume the raw data has been prepared to the point of being functional within the ArcMap environment. If there are issues opening the digital elevation data, please see the various procedures available from http://www.brocku.ca/maplibrary/procedures/procedures.htm This procedure uses DEM data from the Ministry of Natural Resources.
Step One: Adding data to a View
The DEM grid files appear in the map window as distinct tiles.
Step Two: Working with Spatial Analyst
Step Three: Using the Raster Calculator
Merged_30m = Merge(
Where "Merged_30m" will be the name of the merged DEM and "Merge" is the command for Spatial Analyst to merge the grid files together.
Step Four: Customizing the DEM Properties
To view a DEM in 3D you must use ArcScene. Follow the directions outlined at http://www.brocku.ca/maplibrary/procedures/3d_view/3dview.htm
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