I update progress on a nearby construction site, including mapping, and have been producing orthophotos using Drone Deploy. I initially compared those results to WebODM orthophoto with all-default settings and was disappointed that DD was clearly a better image. Then went back into WebODM and re-ran the same file with the Hi-Res template and found that it was maybe a little better than the DD product. Nice!
After reading the Blog recommending the Brown-Conrady lens option as an improvement over the default lens, I again reran the data set with the Hi-Res template edited to the Brown lens. I found the Brown lens to be better in some ways than the default and not quite as good in others. Can’t characterize a compare/contrast, but they were just slightly different to one another and both seemed slightly better than the DD product in many ways, although DD had a very nice orthophoto.
If anyone is interested, I’ve uploaded all four orthophotos to dropbox at this link: https://www.dropbox.com/sh/9o7gijgysx76qot/AAD1QT7XtgPHopFyczwmlcqIa?dl=0
I’ll also upload the data set to the ODM data pool if anyone wants to work on it themselves. This construction site offers a rich set of features for comparison. Lots of different textures, some vegetation, some reflections on water, lots of different colored items that should be straight lines, some highway, cars, structures, etc. This project is known as Miracle Park and I’ll label the file that way. It’s 122 JPGs, and ran in WebODM on my dual-quad core 60GB PC with these times (H:MM):
All defaults : 1:40
Hi-Res template: 3:43
Hi-Res with Brown lens: 3:35
The orthophotos had these GeoTIFF file sizes:
WebODM All-Default: 154MB
WebODM Hi-Res Template: 867MB
WebODM Hi-Res with Brown: 867MB
Offered in case anyone else is searching for answers to orthophoto resolution questions. Images recorded with Phantom 4 Pro. Best regards… Bob R.