I’ve generated a DSM+DTM map of a land survey (captured with a Phantom 3 Std + Litchi) using WebODM at default settings.
WebODM completed processing without issue and generated all the required outputs and more, however, upon inspection of the DSM/DTM/3D maps i can see that they have generated incorrectly.
It appears as if the elevation is bowl shaped (which i know is not the case). I have seen a reference to this same anomaly on this Agrobotix FAQ. The FAQ pins the issue ‘on camera or flight setup’ or ‘inaccurate lens calibration’, which i do not believe is the case, as i have also ran the same image set through DroneDeploy and generated an elevation map which looks far closer to the result i was expecting.
Please see below a comparison of the two maps:
My question is: Have i misconfigured WebODM, or is this a symptom of incorrectly captured images that DroneDeploy is able to correct before processing the elevation map, and, how can i correct this?
Please find below a link to the source images and outputted GeoTIFF files.
WebODM is installed natively on Ubuntu Server 16.04 (as recommended by the installation instructions)
Phantom 3 Standard drone is completely stock, no modifications.
No GCPs were recorded or used.
Land area is ~30 acres.
Any help will be greatly appreciated!