Clipping the DAT file at country rather than continent level for Terrain following

Ravi_Singh · March 16, 2022, 10:38am

I have been using arducopter terrain-following feature by downloading the terrain data from https://terrain.ardupilot.org/
But it is getting repeated every time if I have to go to a new area. The maximum radius we can generate using the above link is 400km. So will have to download manually all the files. Or I can also download data on a continental level. But this increases the requirement for onboard storage. Is there a way that I can define the boundary at the country level, clip the data and download it in DAT format so that I can store it on the autopilot’s SD card?

Mustafa_Gokce · March 16, 2022, 11:02am

I don’t know the file format but…
I tried to document.getElementById("radius").max = 3000 to increase the radius but seems like the server has a limit in this line:

github.com

ArduPilot/terraingen/blob/master/app.py#L101

      
        
            # parse and sanitise the input
            try:
                # request.form['username']
                lat = float(request.form['lat'])
                lon = float(request.form['long'])
                radius = int(request.form['radius'])
                assert lat < 90
                assert lon < 180
                assert lat > -90
                assert lon > -180
                radius = clamp(radius, 1, 400)
            except:
                print("Bad data")
                return render_template('generate.html', error="Error with input")
            
            
# UUID for this terrain generation
            uuidkey = str(uuid.uuid1())
            
            
# Flag for if user wanted a tile outside +-60deg latitude
            outsideLat = None

You can clone the repository and run it by removing that line with the radius that suits your application

Ravi_Singh · December 19, 2023, 12:12pm

Thank you for the reply.
Do you have any idea why is there a limit on this?

LupusTheCanine · December 19, 2023, 1:18pm

I wouldn’t be supporised if it was done for performance reasons.