In QGIS I followed the tutorials: http://geophyswithsnuffler.blogspot.co.uk/2015/11/processing-uk-environment-agency-lidar.html and http://www.qgistutorials.com/en/docs/working_with_terrain.html but note that QGIS is constantly evolving. It's possible to run old versions alongside the latest one, which can sometimes be useful.
- Raster>Extraction>Contour and make sure the output file has a .shp extension (ESRI shapefile). Yes to add elevation attribute ELEV. - Right-click on the resulting contour layer and "Save as…" another shapefile with the CRS changed to WGS84 Next I used JOSM to convert to .osm and along the way adjusting the contour tags to be what OsmAndMapCreator expects. I found an example of what SRTM2OSM produces. It looks like this: <way> ... <nd ref="3000003337"/> <nd ref="3000003338"/> <tag k="elevation" v="1390"/> <tag k="contour" v="elevation"/> <tag k="contourtype" v="10m"/></way> <way> ... <nd ref="3004927551" /> <nd ref="3004927552" /> <tag k="elevation" v="2300" /> <tag k="contour" v="elevation" /> <tag k="contourtype" v="100m" /> <tag k="name" v="2300" /> </way> So using JOSM with the opendata plugin, I loaded the shapefile, hit CRTL-A to select all and changed all tag keys "ELEV" to "elevation" and "ID" to "ref". Then I added the new tag key=contour value=elevation to them all. I think OsmAnd's renderers also now require the "contourtype" tag - I would try giving it the value 10m even if that's incorrect, to make sure the renderers expect it. The save as .osm and use OsmAndMapCreator, File>Create .obf from .osm file. This generates an .obf that you can just copy into your main OsmAnd directory - you should see the new contours in addition to any that you already have. All of these programs have changed in the 3 years since I did this! But I hope this gives you a way in. On Friday, July 10, 2020 at 12:45:14 PM UTC+1, Mika Van de wiel wrote: > > I have now gotten it to work in qgis, however, how can I best export it > for Osmand? I do have Mapc2mapc, but i cannot find any good formats to > export it as. > > Op vrijdag 10 juli 2020 11:12:05 UTC+2 schreef Mika Van de wiel: >> >> 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 mika.va...@gmail.com >>> 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 osmand+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/osmand/fb616faa-3f82-48a8-b4a7-65d0dba88e85o%40googlegroups.com.
