I love the results I get from the orthomap and OpenDroneMap in general, but I’m finding that the pine trees in my mountainous area tend to resolve a bit more… impressionistic and swirly than pines.
Here’s an uploaded example:
High level orthomap:
What I’m wondering is what I should be tuning or testing to improve how the trees look.
My current settings with the ~570 photos I took (which I downscaled to 4000px).
Options: dem-gapfill-steps: 6, dem-resolution: 2, dsm: true, dtm: true, feature-quality: ultra, mesh-octree-depth: 12, orthophoto-kmz: true, orthophoto-png: true, orthophoto-resolution: 2, pc-quality: high, pc-rectify: true, pc-tile: true, rerun-from: odm_postprocess, tiles: true, use-exif: true Average GSD: 2.54 cm Area: 412,877.31 m² Reconstructed Points: 46,354,467
Improvements I think I’ll need to make:
- Fly a more even grid (I’m flying my Air 2S manually because there’s no automated flight planning tools yet)
- Point the camera at -80 or -85 rather than -90 degrees
- Fly multiple grids, offset at 20 degrees (I flew one grid)
- Adjust the altitude of the drone as I go up/down over areas (the terrain is quite mountainous, I thought I needed to keep a consistent height above sea level, but consistent height above ground might be better?)
But other than improving the flight characteristics, what settings should I mess with to try and get cleaner looking trees in the orthomap?
Also, any tips for mapping hundreds of acres of mountainous forests?