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Elevation contours

Started by Sunbeamik, September 09, 2025, 07:48:54 PM

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Sunbeamik

Good afternoon, friends. I found a good website where you can download elevation contours in .pbf format.

http://develop.freizeitkarte-osm.de

However, there is no data that I need here, namely Egypt, Chad and Indonesia. Does anyone know where to get the country elevation contour data in .pbf format?

sockmonkey

One option is you make them yourself such as pyhgtmap, strm2osm or hgt2osm.  I sorta tried them, but there more involved than I care for.  If you go to https://extract.bbbike.org/ they have a format option of contours in .pbf format and you then select a bounding box and they send you a download link for your file(s)

https://garmin.opentopomap.org/ has near global coverage and the offer separate map and contours downloads in .img format, you may find your areas of interest their.  Their maps are on the spartan side, downloads are slow and occasionally the site doesn't load

Another making your own contour option is in .mp format.  This can be done with Global Mapper (paid) or dem2topo ("beerware")

Boyd

Quote from: sockmonkey on September 13, 2025, 08:35:18 AMAnother making your own contour option is in .mp format.  This can be done with Global Mapper (paid) or dem2topo

Of course, if you have Globalmapper, the whole thing is pretty simple. You can create a polygon outlining the area you want on a map, then go do File > Download Imagery > Terrain Data and choose either NASA SRTM or ASTER GDEM to download the DEM data within that polygon. Then it's as simple as a mouse click to generate contours. They could be exported as an .mp file or any other format you like.

But Globalmapper is pretty expensive commercial software. Well worth the cost for me however, have used it very heavily since around 2007. They update it every year but I have only upgraded a few times, currently using a pretty old version.

They do have a free trial version, but it has some limits as to how much data you can export. You could give it a try though, maybe the free trial version would work long enough to do this one project for you?

Sunbeamik