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Generally I am aware that OSM uses external source for SRTM contour data (NASA). However, such data is not available for Iceland (too far North)... The cycle map does have good contour data for Iceland though, and I would like to be able to download this data. Where is it coming from? I have tried to use maperitive with opencyclemap to produce an svg file, but it contains no paths... Ideas? Kind regards edit: It would appear that opencyclemap is just a collection of png tiles...thus the contours are not accessible. hmmm, wonder what his sources were... |
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Apparently some other sources cover iceland, and are used for the DEMs at http://www.viewfinderpanoramas.org/dem3.html#nat . Please check their terms and conditions before use. I found this link by using "iceland dem" as my google search query. I don't know if OpenCycleMap uses this DEM or some other. On their doc page at http://www.opencyclemap.org/docs/ they (that is, Andy Allan) states they use SRTM, but that may be inaccurate, as there seems to be no SRTM coverage of iceland... 1
thank you for the response. I had actually come across viewfinderpanoramas before (sorry I forgot to mention). I will try their source again, but there is a strange possibility that the specific area I am looking for is also not contained withing that data. I shall check and post back what I find. Thanks again for the help
(21 Aug '13, 13:58)
walkingreen
ok. I was wrong. the viewfinderpanoramas dem file does contain the data i needed. It appeared it did not when directly importing into JOSM. However, I used srtm2osm to create 10m elevation contours, and it worked beautifully. I can now import into JOSM, but I don't know how to convert this data into an SVG now... I tried importing into maperitive as it has a good svg export function, but the osm data does not appear to render. any ideas?
(21 Aug '13, 14:46)
walkingreen
Ok, problem seemingly solved. I had to change maperitive rendering style to wireframe. It then successfully exported the contours as svg. I have since imported them into gimp as paths and all appears well. Great stuff.
(21 Aug '13, 15:03)
walkingreen
scratch the last; I remain unsatisfied. Perhaps Andy at opencyclemap does have different sources... I have uploaded my custom osm here: http://filebin.ca/sI52mr8j6ph If anyone can, please import into maperitive and compare to the opencyclemap overlay. There is some x y displacement, but that would be curable. However it seems there is a difference in rotation, or simply distortion. I wanted to use these contours in conjunction with a map such as openstreetmap...this distortion ruins things. Any ideas?
(21 Aug '13, 16:28)
walkingreen
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