Hmm, that would be awesome! we in holland got free hightmaps, but i believe you can only download them in a few formats. if you could send me the tutorial on how to do it in qgis and your nodes I think i can try it!
Op vrijdag 10 juli 2020 03:21:06 UTC+2 schreef A Thompson: > > Hi! I'm no expert, but have experimented with this sort of thing. As far > as I know: > > OsmAnd's elevation data comes from the NASA SRTM/ASTER data that is > available freely for the whole world except towards the poles. This has a > horizontal resolution of 1 arc-second, about 30 metres. The vertical > accuracy varies but seems to be no better than +/-5m. So it doesn't make > sense to have contour line spacing too close. > > OsmAnd's contour lines are pre-computed in the download, rather than being > generated dynamically on your device from raw elevation data, so you can't > try closer spacing just by tweaking the rendering styles. > > Many countries are providing open access to more accurate DTM/DEM data > from LIDAR surveys. In the UK we have this only for flood modelling, which > if one's interested in hills is the opposite of what one wants! LIDAR data > can be amazingly accurate, e.g. you can see the shape of a car. If you have > such data, you can generate your own contour lines in QGIS and get them to > show in OsmAnd. If you're interested I could post some notes I made when I > tried it, but it requires a little dedication. I found that I could now see > features such as cliffs and quarries that had not been marked as such on > OSM, but for me it wasn't worth the large file sizes of what I had > generated. That was three years ago when OsmAnd's minimum spacing was 10m - > I hadn't noticed that the "high" setting now gives 5m. This shows my > missing quarries, but must be the limit for SRTM data. (Unless OsmAnd is > now tapping in to LIDAR? I can't find any information on that.) > > Just google any of the terms I used if you're not familiar! I hope that's > of interest. > > On Thursday, July 9, 2020 at 7:53:18 PM UTC+1 [email protected] wrote: > >> So i live in the Netherlands, and the landscape is pretty flat here. >> However we still have some small relief in the landscape. Most of these >> little hills are no more then 20m but they can be pretty steep. Therefore i >> would like to have contour lines to better estimate the terrain. However, >> the standard contour lines in Osmand only come in three set intervals, Low, >> medium and high. I beleive the high setting displays the contour lines at >> 5m, but this is still not enough. Is there a way to get these contour lines >> to display at a custom interval, like 1m? is this maybe possible by editing >> the rendering file? i would love to hear back from you guys! > > -- You received this message because you are subscribed to the Google Groups "OsmAnd" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/osmand/27a44a9c-7a0b-4e17-acb5-677aef0dbd22o%40googlegroups.com.
