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Exactly. I can't wait until I can do this with my own drone--though maybe I shouldn't hold my breath for the open source package because it seems to have milita

by 205guy 7y ago

Exactly. I can't wait until I can do this with my own drone--though maybe I shouldn't hold my breath for the open source package because it seems to have military applications right now. There's a 1000-ft hill behind my house, and I thought it would be cool to get a 3D print of it. You can do this now with some online apps, based on the terrain model that you see in google maps. But the public data is "only" 30m resolution (https://en.wikipedia.org/wiki/Shuttle_Radar_Topography_Mission#Highest_Resolution_Global_Release https://en.wikipedia.org/wiki/Shuttle_Radar_Topography_Missi...), whereas this technique could probably make a 1m resolution.

DanAtC 7y ago
Depending on where you live, the USGS may already have LIDAR data for your area: https://usgs.entwine.io/ https://usgs.entwine.io/
samplatt 7y ago
>Exactly. I can't wait until I can do this with my own drone--though maybe I shouldn't hold my breath for the open source package because it seems to have military applications right now. I produce 3D models from photogrammetry from drones for the Engineering & Construction industry in Australia. The free software to use is VisualSFM. I recommend flying your drone over your target in a sort of 4-circle Venn diagram, with the overlapping center the actual subject you want to scan. Have the drone pointing inward to the center of each circle while flying, the camera being at a ~55deg angle. You're essentially circle-strafing in 4 circles with a little overlapping bit in the middle. Take video footage of the whole trip and extract individual frames... can't remember if VisualSFM does that for you or not.
205guy 7y ago
Thanks to all replies for the tips.
- samplatt 7y ago
  No worries. check out /r/photogrammetry for a 50/50 mix of hobbyists and professionals.
bigiain 7y ago
If you've got a DJI drone, you can do this for tens of dollars using inexpensive software and services. I've used the SparkPro iOS app (for mission planning and automated flight with a programmed set of waypoints with camera instructions). And this service who'll stitch images together (for free for small enough areas. I needed a plot about 200 x 200m, and its didn't cost anything): https://www.mapsmadeeasy.com/ https://www.mapsmadeeasy.com/ Takes a bit of thinking and experimenting to get a good result. You need to get 4 or more times overlap for everything you want good stitching and elevation data from. (And the DJI specs on their cameras are misleading. I wasn't expecting the FoV spec to be diagonal, so my first attempt didn't overlap as much as Idol intended...)
deleted 7y ago
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by 205guy 7y ago

DanAtC 7y ago

Depending on where you live, the USGS may already have LIDAR data for your area: https://usgs.entwine.io/ https://usgs.entwine.io/

samplatt 7y ago

>Exactly. I can't wait until I can do this with my own drone--though maybe I shouldn't hold my breath for the open source package because it seems to have military applications right now. I produce 3D models from photogrammetry from drones for the Engineering & Construction industry in Australia. The free software to use is VisualSFM. I recommend flying your drone over your target in a sort of 4-circle Venn diagram, with the overlapping center the actual subject you want to scan. Have the drone pointing inward to the center of each circle while flying, the camera being at a ~55deg angle. You're essentially circle-strafing in 4 circles with a little overlapping bit in the middle. Take video footage of the whole trip and extract individual frames... can't remember if VisualSFM does that for you or not.

205guy 7y ago

Thanks to all replies for the tips.

samplatt 7y ago
No worries. check out /r/photogrammetry for a 50/50 mix of hobbyists and professionals.

bigiain 7y ago

If you've got a DJI drone, you can do this for tens of dollars using inexpensive software and services. I've used the SparkPro iOS app (for mission planning and automated flight with a programmed set of waypoints with camera instructions). And this service who'll stitch images together (for free for small enough areas. I needed a plot about 200 x 200m, and its didn't cost anything): https://www.mapsmadeeasy.com/ https://www.mapsmadeeasy.com/ Takes a bit of thinking and experimenting to get a good result. You need to get 4 or more times overlap for everything you want good stitching and elevation data from. (And the DJI specs on their cameras are misleading. I wasn't expecting the FoV spec to be diagonal, so my first attempt didn't overlap as much as Idol intended...)

deleted 7y ago

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