> However, you have to buy as well Photo Scan Pro or Pix4D which very
> expensive USD 3,000 - USD 4,000 for orthomosaicking especially if you
> need DEM.
If you want open source software for aerial photo mosaicking, you can
use ODM. It is not easy to use at the moment.
" OpenDroneMap is an open source toolkit for processing aerial drone
imagery. Typical drones use simple point-and-shoot cameras, so the
images from drones, while from a different perspective, are similar to
any pictures taken from point-and-shoot cameras, i.e. non-metric
imagery. OpenDroneMap turns those simple images into three dimensional
geographic data that can be used in combination with other geographic
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