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ossimlabs / ossim

Core OSSIM (Open Source Software Image Map) package including C++ code for OSSIM library, command-line applications, tests, and build system
MIT License
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How to use ossim-orthoigen to get the orthophoto? #249

Open KeoChi opened 4 years ago

KeoChi commented 4 years ago

For example, I have a set of aerial images. I use SFM to get every pose of aerial images and use MVS to compute the dense point cloud. The DEM can be calculated by interpolation from the dense point cloud. Then how do I use ossim-orthoigen to get the orthophoto? Can you give an example about Orthorectification? Thank you!

oscarkramer commented 4 years ago

The app you want to use is ossim-chipper as it has a better interface for orthorectification. Use the option --op ortho. You need to have a DEM in a file format that OSSIM can handle (for example DTED). Then you need a proper sensor model to perform the ray tracing from image to the terrain. The sensor model will need to be added to OSSIM as a derived class of ossimSensorModel and either added to your core OSSIM or create a plugin. There is documentation on how to do that in the OSSIM documentation.

KeoChi commented 4 years ago

It would be better if ossim could produce a specific tutorial.