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Creating 2D orthomosaics with an M30T

Joined
May 16, 2022
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I'm 'pinch hitting' for a school organization that is looking to create a series of orthomosaics over time. Probably about a dozen per year I imagine. They involve various sports fields that have been marked up, etc for a competition.
While accuracy is not very important, the final resolution of the ortho is. This would be 2D only.
I tried using photoshop and just stitching together images from 200' with my M30T. It worked great, but the resolution wasn't as high as I was hoping for.
I then brought the AGL down to 92' (about 1cm/pixel) and the resolution seems to be exactly what I'm looking for.
However, photoshop blew up at about 150 12MP images, even with 256GB RAM.
I started looking at specific Mapping software and several trials: Pix4D, Agisoft Metashape, Mapsmadeeasy, Mapware, OW and some others. All of them could handle the 400 or so images I capture per ortho, but they pretty much all seem like overkill? Plus, most are way too expensive for someone like me that is just helping a school out. There's zero money in this.

THE QUESTION:
What other apps or tools do you think I should consider?

I'm looking for a simple "panorama stitcher" that can handle at least 400 12MP images. I don't need point clouds or any complexity. Just stitch it with little to no distortion. ie: A football field will still be rectangular after being stitched..
My last resort might be to run several missions of 100 images each and then assemble them in PS myself if I can't find an alternative..

Thanks!
 

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