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I am trying to create a raster mosaic (in ArcGIS 10.1) as I am working with many asc files - I am trying to put all the different tiles together in order to run a view shed analysis. I have been told that the instead of adding one asc file at a time I could combine all into one by creating a raster mosaic, but the problem is when I do create a raster mosaic, it comes up as empty green squares. I have also calculated the statistics and built pyramids but they seem to have no impact.

enter image description here

I was wondering whether anyone could tell me how I can get the terrain to actually become visible as I am using elevation data.

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put on hold as off-topic by PolyGeo yesterday

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "This problem cannot or can no longer be reproduced. Changes to the system or to the asker's circumstances may have rendered the question obsolete, or the question does not include a procedure to enable potential answerers to reproduce the same symptoms. Such questions are off-topic as they are unlikely to help future readers, but editing them to include more details can lead to re-opening." – PolyGeo
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This is the input or result (mosaic)? If result, what do you see when you uncheck the box Footprint? Have you tried to go to the image properties and set stretched symbology with reasonable minimum-maximum? – nadya Jul 31 '13 at 23:23
    
Thanks for that! this is the result and if I uncheck the Footprint everything disappears - its just a blank screen. I have set stretched symbology with mini-maxi but it still appears as green squares and without the footprint it just a blank. if you have any other suggestions I would very much like to hear it! – user19622 Aug 1 '13 at 2:10