I have used a large number of Gtopo30 altitude tiles and used the mosaic tool to create a large DEM for my area of interest. I am trying to get a slope for said area but when running the slope (Spatial analyst) tool I have large gaps. I split the large DEM up into smaller chunks and successfully run the slope tool on each. I am now trying to mosaic them together into a single layer. I have tried mosaic to new raster but this is not showing the full area and also the values have changed. originally my slope would vary anywhere from 0 up to around 85 but after running the mosaic to new raster 7.xxx is the smallest value and it rises to over 2000. Can anyone tell me what I have done wrong or another way of putting the multiple slopes together into one.
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I would think your problem is in the chosen Pixel type.
Check the smallest and largest values in all your rasters - or just choose a Pixel typethat surely fits your range. Click the drop down menu and in the right field you can read which one is right for you.
On a slope raster 16-bit signed should be a wide enough range.
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I have tried with the 16-bit signed pixel type and I am am still getting the incorrect values. – Billy Gardener Jul 9 '18 at 14:24
Mosaic to New Raster? – blabbath Jul 4 '18 at 14:40