Mosaic DEMs

Discussion created by boyle.matt on Nov 2, 2016
Latest reply on Nov 2, 2016 by CBenkelman-esristaff

We have received 2 DEMs for a project; one covers our entire county and has 6ft pixel resolution.  The other only covers a major city, has irregular boundaries, and is 3ft pixel resolution.  Since the 3ft DEM has irregular boundaries, there are areas of NoData within the DEM extents.


I have a few questions below since I don't work with rasters that often:

  1. What is the workflow to mosaic these 2 DEMs together?
  2. How do I have the 3ft DEM show on top of the 6ft DEM where applicable? I use ZOrder?  Do I set the ZOrder on the primary rasters or overviews?
  3. Will having NoData values within the 3ft DEM extent cause an issue?...i.e., show as white space on top of the 6ft DEM?
  4. Our 6ft DEM does not show at all extents for some reason.  When I am zoomed out to Full Extent, nothing is shown, why is that?


Any help would be greatly appreciated!