[mkgmap-dev] Process for Creating Contour Maps?

Mon Feb 22 07:51:41 GMT 2010

have done for srtm data for parts of US and viewfinder data in the alps
started today to automate it for US based on NED 1 arc second data which is much better than SRTM. 
1/3 arc second data is even better but requires to split most tiles and haven't done that yet.
groundtruth didn't work at all for me and now it's all based on gdal* tools shp-2osm and mkgmap with some perl wrapping around. currently I use 25m contour lines and most tiles fit without splitting. 
Lars has all NED data and plans to start sharing at least 1 arc second data approx 60G, 1/3 arc second is approx 600G and can't be shared easily. We had some recent discussion on talk-us how this can be done. stay tuned

On 21 Feb 2010, at 15:51 , Jeffrey Ollie wrote:

> Does someone have wiki pages describing the best procedure to create
> contour maps for Garmins?  It seems like a number of people are having
> some success but it doesn't seem to be very well documented.  I'm
> working though trying to get groundtruth to generate .osm files with
> contours in them and then using mkgmap to create an .img file but
> mkgmap is segfaulting.   In any case though, I'd like to get contour
> maps using better data than the STRM that groundtruth uses. My
> ultimate goal is to generate contour maps for a trip out to the Grand
> Canyon this summer.
> 
> -- 
> Jeff Ollie
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