I have tried to capture a barley field, but using ODM the resulting orthophoto does not cover the surveyed area.
The photos and gcp list is available here
Here is a screenshot from QGIS showing the resulting orthophoto and the camera positions from the drone.
I used a DJI Phantom 4, and I programmed the flight with PIX4D capture, with the following settings
-Front overlap 75%
-Side overlap 60%
-Camera angle 90 deg
-Look at grid center no
Roughly 400 × 300 m were covered. This resulted in 292 photos. I have 4 GCP’s.
I used the high quality orthophoto preset.
The resulting orthomosaic only covers very little (mostly the center) of the surveyed area. I have tried different variations of settings in ODM without it drastically changing the result.
Up until now i have not experienced this issue.
I suspect it is because my photos are too similar and featureless, but I am unsure.
If that is the case, do you have any suggestions on mission planning to get photos that are useful for creating a orthophoto.