mtbmap
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mattesCZ
Web map for mountain biking and hiking based on OpenStreetMap data.
Use SRTM data to detect incline and render it in map.
Display warning symbol on mtb:scale points. Documented here: http://wiki.openstreetmap.org/wiki/Key:mtb:scale
Some possible icons can be found here http://wiki.openstreetmap.org/wiki/WikiProject_Czech_Republic/OTM_zna%C4%8Dkov%C3%BD_kl%C3%AD%C4%8D Consider usage of icons in SVG.
Sometimes contours seem to be shifted to any side by a half pixel of SRTM raster data.