Issues with DEM Rendering & Legend in ArcGIS Pro 3.6 (DRA On, Merged DEM Tiles)

Question

I’m running into a couple of issues after upgrading to ArcGIS Pro 3.6, and I’m wondering if anyone else has seen this or found a workaround. These issues did not exist prior to updating.

I’m working with a DEM that was created by merging multiple individual DEM tiles. These were merged using Raster Functions Merge. When I have Dynamic Range Adjustment (DRA) turned on, everything looks correct in the Layout view. However, when I export the layout, the DEM shows unexpected lines across the surface. These lines don’t necessarily correspond with the boundaries of the original tiles, and they only appear in the export, not in the Layout.

A second issue is that, with DRA enabled, the DEM sometimes no longer appears in my legend. It simply drops from the legend altogether. Neither of these behaviors occurred in earlier versions of ArcGIS Pro.

Has anyone experienced this after upgrading to 3.6? Any suggestions or known bugs I should be aware of?

Thanks in advance for any help!

RTPL_AU · Answer

Hi @WoodlandHeritageNW

Do you have transparency enabled for the DEM layer (i.e. to make an underlying image visible, etc)? If so, and you export a layout to PDF there will be lines visible due to inherent PDF process issues. This is an old issue so you may be seeing something else.

A fix for that is to have no transparency on the DEM layer, and placing it into a group layer to which you apply the transparency.

There is also a setting to render all images as a single raster in the pdf export settings but I've had other issues with that.