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1

General / Striping artifacts when orthorectifying drone imagery

« on: June 03, 2024, 09:20:09 PM »

Hello, I am curious if anyone else has encountered any striping artifacts when orthorectifying drone imagery, where parallel flight lines alternate between relatively darker to relatively lighter reflectance. These artifacts are affecting my results when applying spectral indices to the orthomosaic to classify various surface features.

For reference, I am working with multispectral imagery acquired by a Micasense RedEdge-MX Dual Camera system, which was mounted to a DJI Matrice 350 RTK. The mapping survey took place over the Lemon Creek Glacier in Southeast Alaska, and the images were acquired over a three day span since we were mapping such a large area. As such, there were differing lighting conditions encountered during the course of the survey.

My first thought was that differing sun angles were causing the striping artifacts when the drone flew in a westward direction vs an eastward direction. However, I also captured imagery with a DJI Mavic 3 Mutlispectral over the same area and time span (see the second attached image), and this orthomosaic does not show any striping artifacts at all. Therefore, I am not sure why the striping artifacts would show up in the Micasense orthomosaic, but not the Mavic 3M orthomosaic. Could this be an issue related to the Micasense camera system?

If anyone knows what might be causing these striping artifacts, please let me know!

Thanks,
Colby

2

General / Metashape Pro Crashing During Image Alignment

« on: October 13, 2023, 11:33:06 PM »

Hello,

I am having an issue with Agisoft Metashape Pro (Version 2.1.0) consistently crashing during the image alignment step. Metashape is able to get through the matching points phase, but usually fails during the estimating camera locations phase. Occasionally, Metashape will successfully be able to align photos, but other times the application crashes, despite the fact that it is processing the same set of photos with identical parameters. Thus, I can't make sense of why it will work some of the time, but usually results in a crash.

The specs of my newly built PC are as follows:

OS: Windows 11 Enterprise (Version 22H2)
CPU: Intel Core i9-13900K
GPU: NVIDIA GeForce RTX 4070 Ti (MSI model)
Memory: 128GB DDR5 RAM (4 sticks of Corsair Vengeance CMK64GX5M2B6400C32)
Storage: 4TB NVMe SSD
Motherboard: Gigabyte Z790 AORUS ELITE AX

I have all the latest drivers, and I am using the most recent version of Agisoft Metashape (I encountered the same errors on the previous version as well). After submitting my crash logs to Agisoft customer support, they inspected them and let me know that they do not appear to be connected to any known issues. They suggested there was a high chance that these problems were caused by faulty RAM modules, and recommended I test the RAM with Memtest86. I did this, but the test passed with zero errors (see the attached report). I am running my system without XMP or any other overclocking features.

Please let me know if anyone has any suggestions or ideas about what is causing these application crashes!

Thanks,
Colby