Mapping - Minimal Oblique Overlaps for 3D
Has anybody experimented with mapping, grid layout, olblique (e.g., -67°) and minimal % of overlaps, forward and side in association with producing 3D models?
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5 comments
Check out this page on the WebODM documentation which has useful information
https://docs.opendronemap.org/tutorials/#creating-high-quality-orthophotos
Interesting approach using a 20° grid pattern versus 90°. It looks like for a Dronelink map mission (Hobby elite/ non-professional/ retired land surveyor living on social security plan) would use 2 consecutive Normal patterns; e.g. one with Flight Direction at 350° and the second at 10°, as I didn't see where Dronelink's Grid pattern could be anything other than 90°, though I could easily be wrong. Grid's Flight Direction setting appears to be a global setting for both Grid.1 and Grid.2
Hi V. Kelly Bellis yeah that looks a good way round the 20° angle, one suggestion I'd make, is move the start point of the second layer to the end point of the first layer, and set the arrival time of second layer to 1 second rather than the default 4
Thanks Martin for that suggestion as it shaved off about 3 minutes, which is good for my 3-battery mindset. I believe I dragged the correct start pin for grid.2, and though at this scale, I can't really tell if the start pin for grid.2 snapped onto the end of grid.1.
The other thing that helped, at least insofar as I was able to digest, was reading the source article (https://onlinelibrary.wiley.com/doi/full/10.1002/esp.3609) cited in the link that Barry gave to the ODM article (above). After reading through it a number of times, I'm still left with wondering about the benefit of grid altitude separation; e.g., 5%, grid.1 @ 118 m, and grid.2 @ 112 m; or either singularly or in combination mixing difference in grid altitude separation and switching gimbal; e.g., grid.1 118 m -85°; grid.2 112 m -80°.
In case anybody might find this minimal overlap experiment interesting, below is Global Mapper's Overlap Report 20230325 1776 beta7_5 mapping, the gist of which is in this table with more of the gritty details in the PDF; available upon request (apparently can't attach PDFs here?).
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