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I just updated my ArcGIS to version 10.1. When using ArcMap, I've not been able to perform mosaicking without getting an error when I use the "Mosaic" tool in Data Management Tools -> Raster -> Raster Dataset. The error does not tell me anything. When using "Mosaic To New Raster" I don't get an error, but it also does not create the mosaic.

I've checked Environments settings to see if there was a problem there, but they seem to be correct. I'm using elevation rasters for the mosaic. Is there something that I need to do since the upgrade in order to correct this problem?

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Building on the good advice from Roy, try building a raster mosaic (or raster catalog) directly in your geodatabase. Check out the helpful reference on raster data models.

To begin, in Arc catalog right click on your GDB and choose New > Mosaic Dataset...

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Again, in Arc catalog right click on the newly created mosaic dataset and select "Add Rasters..." The new window will allow you to add your rasters and set the environment.

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  • Thanks for letting me know about this. However, I get an error message that reads "This geodatabase is not supported. Please upgrade your geodatabase to 10.0 or higher".
    – Renee Cammarere
    Commented Sep 25, 2012 at 18:09
  • I've never upgraded my geodatabase when I upgraded my ArcGIS before. How do I go about doing that? Thanks!
    – Renee Cammarere
    Commented Sep 25, 2012 at 18:09
  • First off, make sure you are not using a personal GDB, which will have a .mdb extension. Personal GDBs have pretty serious file size limitations, whereas file geodatabases (.gdb) can handle large rasters.
    – Aaron ♦
    Commented Sep 25, 2012 at 18:45
  • Aaron, I tried what you and Roy suggested, but the resulting raster did not leave me with the option of "Classified" under "Symbology". I attempted to calculate a histogram, but am not sure if I did it right since I am not able to apply a layer file using the "Classified" option. Is there some step that I missed. Before, ArcGIS would give me the option of computing the histogram, and then just go off and do it (not so doing it this way).
    – Renee Cammarere
    Commented Sep 27, 2012 at 18:53
  • On the resulting raster, I tried running (in the Arc Toolbox) Data Management -> Raster -> Raster Properties -> Calculate Statistics. Then when I tried to apply a layer file in "Symbology" and "Classified" I got the error message "This dataset does not have valid histogram required for classification method, run Calculate Statistics tool to generate histogram".
    – Renee Cammarere
    Commented Sep 27, 2012 at 19:14
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Raster datasets are sort of the 9.3 way of doing things. I'd consider creating a Mosaic Dataset. You can add whichever rasters you want and they'll be stitched together.

Right click gdb -> New -> Mosaic Dataset

To add rasters, right click the empty Mosaic Dataset -> Add Rasters (make sure to calculate statistics, build overviews, etc in advanced settings)

For me, this last step of checking all the settings was the critical step: check all of the following: update cell size, update boudary, update overviews (this will grey out the previous two). AND under Advanced, check all of the following: build pyramids, calculate statistics, build thumbnails.

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