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OpenDroneMap / ODM

A command line toolkit to generate maps, point clouds, 3D models and DEMs from drone, balloon or kite images. 📷
https://opendronemap.org
GNU Affero General Public License v3.0
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Blank Orthophoto and map tiles for very close up images of ground field (~0.05 cm/pixel GSD) #1130

Closed theiosdevguy closed 4 years ago

theiosdevguy commented 4 years ago

Dear Community,

I'd like to start with thanking everyone in making such a wonderful project. Thank you very much.

How did you install OpenDroneMap? (Docker, natively, ...)?

Docker (NodeODM)

What's your browser and operating system? (Copy/paste the output of https://www.whatismybrowser.com/)

Chrome, Ubuntu 18.04

What is the problem?

Ground close up images with GSD around 0.05cm/pixel are not creating any orthophoto output and no tiles output. But 3D model is generated fine.

I have a set of around 5000 images that are very close images of the ground. All of them have EXIF data with GPS coordinates in them. I tried with a sample of first 100, first 50 and even first 10 images but I do not get any output in orthophoto and tiles. The files are generated but are blank. I changed tiles creation zoom level to 30 (35 level throws exception) just to check if it needs more zoom level but it didn't change anything.

What should be the expected behavior? If this is a feature request, please describe in detail the changes you think should be made to the code, citing files and lines where changes should be made, if possible.

Maybe I am missing some configuration but does ODM create orthomosaics and tiles for very close up images of ground? Is there any way to achieve this?

How can we reproduce this? (What steps did you do to trigger the problem? What parameters are you using for processing? If possible please include a copy of your dataset uploaded on Google Drive or Dropbox. Be detailed)

I am attaching first 10 images from my dataset https://drive.google.com/file/d/1l3X7yVD6XuNg1g-laLBsKb9Uhsuz-mdW/view?usp=sharing

pierotofy commented 4 years ago

I think you need to set --ignore-gsd and manually pass a better --orthophoto-resolution value. The defaults are not going to work well because ODM assumes that you are flying at a certain altitude.

theiosdevguy commented 4 years ago

@pierotofy Thanks for the response. I tried with Orthophoto Resolution set to 100 and Ignore GSD set to TRUE but same results. Any idea why this would be happening?

pierotofy commented 4 years ago

You probably need to lower the value, not increase it. Let's move the conversation to the forum though, as this looks like a usage question and not a bug :pray: https://community.opendronemap.org

smathermather commented 4 years ago

Psst, try to set orthophoto resolution to 0.05 and set ignore gsd, and yeah, come on over to community. It's a great place with lots of people who can be benefactors and beneficiaries of these support questions. In fact, if this works, do a quick post on community of what your question was and the solution.

theiosdevguy commented 4 years ago

@pierotofy @smathermather Thanks. BTW, I tried 0.05 and ignore gsd but same results. No orthophoto, no tiles. But in all the cases I get 3D Model generated. I wonder if 3D Model is generated why is Orthophoto blank.

smathermather commented 4 years ago

Linking to the community post from here as well: https://community.opendronemap.org/t/blank-orthophoto-and-map-tiles-for-very-close-up-images-of-ground-field-0-05-cm-pixel-gsd/4862/2