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DEM files for hillshading?

Noisy River shared this question 9 years ago
Answered

It would be really nice, if it would be possible to use DEM (.hgt) files for hillshading. QLandkarte is doing this and I would not need an online connection or download large files just to have hillshading,

Replies (4)

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Hello,


Thank you for report.


We had almost the same idea about 6 months ago. Unfortunately the solution for this task is not so simple. QLandkarte probably uses gdal for converting *.hgt files to geotiff (don’t know exactly so correct me if I’m wrong). Other issue is limited performance of mobile devices. Rendering of vector maps is quite problematic and computing of hillshade would need other resources. So we decided that vector maps are and without hillshading – atleast for couple of next months.


We like hillshade but implementation is little bit tricky right now.


Thank you for understanding

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About QLandkarte converting .hgt to geotiff you are correct. If Locus could read geotiff this would be perfect too!! For me this has the advantage to only have one file e. g. for the whole western alps but of course it is not very user friendly.


About the rendering: I have the strong feeling, that my Galaxy Note II with its Quadcore is performing better than my older Dual-Core Laptop. And the Laptop is good enough for QLandkarte with Hillshading.


Second thought: Orux is doing 3D viewing with origin .hgt files. From my point of view funny buth useless - but for sure not less demanding in terms of performance. Correct me if I am wrong.


For me this would really be a big point as the hillshading makes the OSM maps much better readable.

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Hi,


Unfortunately Locus is not able to import geoTiff files.


Anyway there are one or two workarounds:


1.Map Overlay


You can use overlay function to cover arbitrary map from Locus with hillshade data (Maps > Overlays > Hike&Bike hillshade)


http://docs.locusmap.eu/doku.php/manu...


But this solution needs internet connection or cached hillshade data


2. Create own hillshade map


Please note: this solution is only my theoretical idea...not sure if will be successful.


For offline usage it should be possible to convert geotiff file into sqldb format using MAPC2MAPC http://www.the-thorns.org.uk/mapping/


How to convert map: http://docs.locusmap.eu/doku.php/manu...


After that you can use again Map overley with converted map.

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Thanks. Tried MAPC2MAPC but was not not succesful. Could read my alps.tiff but this seams to large to convert. Anyhow, I found that it will create tiles for every zoom just like a Locus maps download - which will result in much, much more data than the original .hgt (or Geotiff?).


So, as you mentioned, its a workaround but with the disadvantage of significantly increased memory consumption...

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