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ODM
A command line toolkit to generate maps, point clouds, 3D models and DEMs from drone, balloon or kite images. 📷
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
https://github.com/OpenDroneMap/ODM
You take a drone, point the camera mostly down (a narrow angle, not straight down), take photos of land, with some overlap, preferably from different angles, load the software, and it creates an ortophoto, 3d model, height map, all georeferenced
A better solution would be to use a program that does what most people think of when they hear the word photogrammetry these days, 3D reconstruction from multiple images, and then make an orthorectified image from that.
OpenDroneMap can do that for example.
https://www.opendronemap.org/webodm/
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