OpenDroneMap – Simple Images into 3D • Hacker News Board

Re: OpenDroneMap – Simple Images into 3D

#41

Post by SahAssar » Tue, Mar 26, 2019, 9:41 PM UTC

linsomniac wrote: post #21

This morning I was watching a "video editing" youtube video where he made a 3D terrain object to load into Davinci Resolve (commercial but free for personal use), and track to the palm of his hand so it looked like the terrain was floating above his palm. He used http://terrain.party/ to get height information as an image (lighter colors are high, darker are low), then a script scrape together images from Google Maps…

That's a really roundabout way to do that though... He's basically taking free height data, converting it to a raster image, and then approximating it in the editor (which tries to convert the raster heightmap back to a proper map). The actual satellite imagery might be harder to (legally) get (and he basically suggests removing the copyright notices in the video).

It's cool that it works, but it's also the "wrong" way to go about it considering all the tools around to work with open, free GIS data.

Re: OpenDroneMap – Simple Images into 3D

#42

Post by plausibilities » Tue, Mar 26, 2019, 10:42 PM UTC

mohaine wrote: post #33

fsloth wrote: post #7

It would be nice to know how this compares with other open source and commercial photogrammetric offerings. Free: - AliceVision https://alicevision.github.io/ - Colmap https://colmap.github.io/ - etc. Commercial: - Agisoft Metashape (formerly Photoscan) https://www.agisoft.com/ - Zephyr 3D https://www.3dflow.net/3df-zephyr-pro-3d-models-from-photos/ - Drone deploy https://www.dronedeploy.com/ - etc etc etc See also:…

We are using ODM for generating orthomosaic photos and it produced better results than the commercial offerings we have seen (In some cases MUCH better). Note this did require us to tweak the settings some but overall it was pretty easy process. Things of Note: 1) ODM didn't quite scale as well to very large number of photos. (I think this may have been fixed now). 2) Our use case was pretty brutal. ~1 cm resolution…

One of its dependencies, OpenSfM, does a lot of the heavy lifting with regard to generating things like HOG descriptors (since SIFT = $IFT)

That project used to have a bug with their multithreading implementation where if your photo sets got too big children threads would terminate but fail to get reaped and your heap size would just continue to grow until things kaboomed at the SfM phase.

Not entirely their fault though as it stemmed from a deeper issue with Python stdlib's pool implementation.

Back then, with certain photosets I would literally run OOM on my homelab which was equipped with 128 GB DDR4

Should be fixed by now though.

You wouldn't happen to work for a small MPLS based startup would you?

Re: OpenDroneMap – Simple Images into 3D

#43

Post by linsomniac » Wed, Mar 27, 2019, 2:28 PM UTC

SahAssar wrote: post #41

linsomniac wrote: post #21

This morning I was watching a "video editing" youtube video where he made a 3D terrain object to load into Davinci Resolve (commercial but free for personal use), and track to the palm of his hand so it looked like the terrain was floating above his palm. He used http://terrain.party/ to get height information as an image (lighter colors are high, darker are low), then a script scrape together images from Google Maps…

That's a really roundabout way to do that though... He's basically taking free height data, converting it to a raster image, and then approximating it in the editor (which tries to convert the raster heightmap back to a proper map). The actual satellite imagery might be harder to (legally) get (and he basically suggests removing the copyright notices in the video). It's cool that it works, but it's also the "wrong" w…

Indeed. I was stuck at getting the correct images for the area I had the height map for. My plan was to use the NAIP images, which I have sitting here on one of my computers, processed, and is free.

But, I ran into some weirdness with Davinci Resolve where it was getting "Media Unavailable" for some frames of the video. Once I went down that rabbit hole, I was just tired of that video and wanted it done. So I didn't add a spinning 3D map of the area, just added some titles and music and called it a day.

Agree that it's not cool to remove copyright.