topic No data areas in mosaic dataset in ArcGIS Pro Questions

No data areas in mosaic dataset

Y_Chau — Thu, 06 Aug 2026 12:12:36 GMT

I created a mosaic dataset with ASTER DEM files. The files are contiguous but when I add them to MD, gaps appear at edges. These gaps keep moving with every zoom level. How can I correct this?

Re: No data areas in mosaic dataset

JonM32 — Thu, 06 Aug 2026 12:20:29 GMT

@Y_Chau do the gaps appear when you add the files one by one into the map?

This isn't uncommon for edge data in rasters. I've had it happen in imagery that wasn't tiled perfectly. Sometimes building pyramids/overviews can clean up the no data spots.

Re: No data areas in mosaic dataset

Y_Chau — Sun, 09 Aug 2026 13:51:10 GMT

Hi @JonM32

There are no gaps in the data when I add the tiles outside of mosaic dataset. The gaps appear and disappear when I zoom in and out. The attached video will give you a better understanding of the problem.

I rebuilt the pyramids and statistics for the mosaic dataset including the source rasters but I cannot get rid of this problem.

Thanks

Re: No data areas in mosaic dataset

JonM32 — Mon, 10 Aug 2026 12:33:31 GMT

@Y_Chau

Thanks for the video.

I have two other tool suggestions; Mosaic to New Raster and Build Seamlines

I'm honestly not sure if either will fix your issue but it might. The one will require building a new raster merging all your individual ones together. This could take a while depending on how big your dataset is, but if it's small or large pixel sized, it'll go fast.

The seamline one sounds like it could fix the issue, but I don't have a ton of experience using it. Worth a try though!

Here are two resources related to each method I gave above:

Mosaic dataset seamlines | ArcGIS Pro documentation

Merge Multiple Raster Datasets into a New Raster Dataset in ArcGIS Pro