I am wrapping up a processed dataset, and the ortho measurements are really really off. It’s showing for some reason that the whole property I mapped is 3 acres with the measurement, but it’s actually more like 90-100 acres. Am I using the tool incorrectly?
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That’s atypical. Does it place correctly in the world? How are you doing your calculations?
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I don’t think it’s placed correctly in the world. It’s just black all around the map. I was using the measurement tool to place points on the map.
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If it isn’t placed correctly then there’s no way it will give you reasonable measurements. 
Some things to check:
- spot check your images to make sure they have longitude, latitude, and height of the drone in the exif data
- If they do, then perhaps there are some that are corrupted, so a tool like
exiftoolwill allow you to check them en mass, or post them somewhere so someone here can inspect them. - Posting the log would be helpful, as then we can see what WebODM is seeing in the images. Just upload it to a file sharing site like Google Drive and throw a link in your reply.
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It was my bad, on export I didn’t remove the default checkbox to “Remove Location Data” in lightroom. I was doing some pre-processing to fix some shadows. Sorry about that.
Quick question: Would that affect the quality of the orthophoto as well?
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Ahh! That’d do it.
Not having exif info will have an effect on the calculation of resolution, and could significantly degrade the ortho.
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