Known Issues

On this part of the webpage we inform you about known problems with TopoFlight products and how you can avoid them until a new software version is released.

MissionPlanner: SRTM Heightmap Download

In TopoFlight's MissionPlanner, the download of SRTM data doesn't work anymore. The altitude data are now available via a different internet sources and in a new version (v3 instead of v2.1). The actual release of MissionPlanner uses a link to the old source and is not compatible with the new format. Currently we are working on a new release where this problem will be solved. Until then, you will find a workflow below on how to obtain SRTM elevation data yourself and integrate it into TopoFlight.

Step 1: Which SRTM tiles are needed?

The third step for the SRTM import in MissionPlanner shows which tiles of SRTM are needed for the selected area. 

Step 2: Download the tiles.

SRTM data are available at 1 arc second resolution or at 3 arc second resolution. Use one of the following links and adabt the WGS84 Lat/Lng coordinates to download the required files.


1'' resolution:


3'' resolution:


For the download a EOSDIS Earthdata login is required, which you may create free of charge.


Step 3: Convert to GeoTiff.


Import the HGT files into a 3rd party software such as QGIS and join them into one GeoTiff.


Here, You will find the merge function in QGIS:

Raster -> Miscellaneous -> Merge


Pay attention to the coordinate system of the exported GeoTiff.


Step 4: Import in MissionPlanner.

The last step involves importing the created GeoTiff into MissionPlanner. To do this, use the "Import DTM" -> "Tiff DEM" function.


Make sure to select the right coordinate system of your GeoTiff before importing the data and creating the Quadtree File (.qtr).