So, possibly you will have to make some flight missions to map a large area using FARM-Mapper UAV. Such kind of projects will normally produce some pieces of photomaps. Or, in other possible scenarios, you have some adjacent photomaps taken from different time or you have to manage some photomaps not only you’ve produced yourself using FARM-Mapper UAV but also photomaps provided by third parties. You may have some tasks to handle with:
- integrating your photomaps with other different coordinate system maps.
- merging some photomaps into one piece of photomap.
- deriving vector data from your photomap.
Handling Photomaps Coordinate System
Your photomaps produced from images taken by FARM-Mapper UAV (see: How to produce geo-referenced photomaps) will likely have geo-referenced. Within QGIS, your aerial photomaps will be treated like any other raster data. You have to tell QGIS what Coordinate Reference System your aerial photomaps have. You can adjust how your photomaps look on displaying device or printer from Layer Properties window (menu: Layer>Properties…).
Whatever coordinate system or image format your photomaps have, you can easily overlaying them with your other spatial data using QGIS. QGIS has a fantastic feature to handle various data format with different coordinate system. What you need to do is only put a check mark on “Enable ‘on the fly’ CRS transformation” option from Project Properties window (menu: Project>Project Properties…). Boom! Whatever coordinate system your different data have, all of them will projected seamlessly into ONE coordinate systems you’ve choose – as long as you’ve defined their Coordinate Reference System correctly.