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The piece of program Srtm2Osm uses SRTM elevation model from NASA to produce countour lines in OSM format.

Does it use the SRTM1 at 30m or SRTM3 at 90m?

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    Welcome to GIS:SE @Vincenty! From the link you gave, it is mentioned in the Limitations section: "Currently the tool only supports SRTM3 data." Although I can't confirm this as in the Things Still To Do section, it is mentioned that there were plans to support SRTM1 data... – Joseph Jun 28 '17 at 10:05
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    Thanks, well spotted! I believe contour lines would be much nicer with STRM1 with no voids – Vincenty Jun 28 '17 at 10:42

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