Geographic Information Systems Stack Exchange is a question and answer site for cartographers, geographers and GIS professionals. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I encounter edge issues when trying to mosaic USGS NED DEMs in ArcGIS 10.0.0. After projection and aggregation, I attempt arcpy.MosaicToNewRaster_management(). I've reproduced the same results using .tif, .img, and GRID formats. I've also reproduced the result using file geodatabases and file folders to store inputs and outputs. I've also tried using arcpy.Mosaic_management() with no luck. Note the unwelcome black border on the bottom which is problematic for analytical applications.

Q) What can be done about the edge issues here?

NOTE: this question was split from this question.

enter image description here + enter image description here = enter image description here

share|improve this question
If you have a polygon representing the outline of the mosaic or each of the individual input rasters maybe you could use this to set an analysis mask. I know this does not solve the problem of the black edges but it might allow you to carry out your analysis. You could also convert all the images to points and create a terrain and use this in your analysis. – dango Jan 14 '13 at 9:03

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Browse other questions tagged or ask your own question.