I’m trying hard lately to make a follow terrain flights based on custom DTM maps that I made.
I created DTM maps in Pix4D and exported it to Mission Planner thru global mapper in a 32-bit float resolution.
I succeed to see that the mission planner is using my DTM map - in the height information in the flight plan window, I see geotiff heights.
But in the bottom line, when I tried to fly based on these maps, the drone isn’t following the terrain height successfully.
I tried a lot of things:
tried to change the terrain_spacing parameter from 100 to 1. (when the parameter was under 30, the SD cannot load the data and got lots of error messages (bad logging, no IO threat…)
tried to clean the pixhawk’s SD and write mission with only DTM on the mission planner folder, with DTM and SRTM and with DTM and only general SRTM files.
Nothing made it works.
I’ll be really glad if someone has an idea that can help me or see something that I missed.
Meeting the same problem …
High precision DEM, Issues with changing the Terrain Spacing parameter under 30.
When flying with terrain spacing=30 the drone is not following precisely the DEM, there is between 3 to 4.5 meters diversity between the drones height to the DEM when going over the logs.
What would happen if we use a different geoid? We got our elevation data in ETRS89 and we didn’t manage to convert it reliably yet. If we load it in Mission Planner it seems to work and is displayed properly on the PLAN tab.
Will we get problems flying with it when following terrain? We’re indeed using uBlox GPS on our drones, two Here3 to be more precise.