topic Re: Issues with parallel processing in Drone2Map in ArcGIS Drone2Map Questions

Issues with parallel processing in Drone2Map

tribesman2007 — Thu, 30 Apr 2026 14:08:11 GMT

I'm running Drone2Map on a new machine (HP Z8 Fury Tower G5) with 64 cores (no CUDA) and running into issues with parallel processing.

I'm trying to generate True Orthos for a set of 1,751 images, and the AddRastersToMosaicDataset tool is consistently throwing ERROR 160281: A requested row object could not be located. The log output reveals two further errors:

Error: 8004819c: Could not initialize the mosaic dataset's parallel processing engine.
Error: 80048178: Cannot synchronize mosaic dataset items associated with the specified raster type instance. [Name: UAV/UAS; Instance ID: 1]

Since the issue seems to be with parallel processing, I've tried reducing the number of CPU threads (I've tried various numbers between 1 and 105). I continue to get the same errors.

I notice in the log that even when I reduce the number of threads (in both project settings and in the global settings), the AddRastersToMosaicDataset tool doesn't seem to honor that number and always reverts to a parallel processing factor of 50%, which on this machine is 64 threads.

I'm surprised that I haven't seen previous threads on this issue. Any suggestions would be appreciated!

Re: Issues with parallel processing in Drone2Map

JamesHead-Mears1 — Wed, 06 May 2026 23:59:32 GMT

I ran into the same issue with ArcGIS Pro (Parallel Processing Issues when setting up Imagery... - Esri Community). ESRI reached out but didn't really give me a solution to it.
Did it work with no multithreading?

Re: Issues with parallel processing in Drone2Map

tribesman2007 — Thu, 07 May 2026 18:04:51 GMT

@JamesHead-Mears1 Unfortunately no - this is where I'm running into the secondary issue of Drone2Map not honoring the parallel processing settings (both global and project settings). When I reduce the number of threads to 1, the AddRastersToMosaicDataset tool doesn't seem to get the message and keeps using the default parallel processing factor of 50%.

Re: Issues with parallel processing in Drone2Map

MarkBarker1 — Mon, 08 Jun 2026 15:37:40 GMT

Hi @tribesman2007 & @JamesHead-Mears1,

Are you both still running into this issue with the latest release? (D2M 2026.1)

Thanks,
Mark