[GIS] Raster mosaic not displaying raster values ArcGIS 10

arcgis-10.0image-mosaicraster

I have eight DEM tiles that I downloaded from the USGS National Elevation Dataset. The individual rasters are displaying correctly, but when I try to combine them in a Raster Mosaic I get arbitrary values (3.4+038 -> -3.4+038), which is considered to be NoData.

I've tried several times, half the time I get a warning message upon creation of the Mosaic (001003: Datum Conflict) even though I was sure to match coordinate systems. I've even imported the coordinate system from one of the rasters going into the mosaic.

The mosaic shows the footprint of the DEM, but none of the data
Mosaic

I had a similar problem here, but I followed the process of converting to tif before I tried to mosaic the images.

Best Answer

I ran into the same issue today, the following worked for me:

  1. Create raster mosaic dataset. Make sure to specify your pixel type. In my case, I specified 16 bit unsigned.
  2. In the "Add Raster to mosaic dataset" window check the "update overviews" box. Under "Advanced Options"
  3. Also from the advanced options, import your coordinate system. Make sure to select "Calculate Statistics" , "Build Raster Pyramids" and "Build Thumbnails"
  4. Finally, run a sample on 4 images, rather than your entire dataset, to make sure you get the results you want.

Good luck!

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