Jeffrey Ollie schrieb:
> 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.
Dear Jeffrey,
there are two different approaches:
- Using srtm2osm to generate contour lines as osm files.
- Using mkgmap to generate the contour lines directly.
In both cases you'll need appropriate entries in your style file to
determine which contour lines are mapped to major/medium/minor contours
(0x22, 0x21, 0x20).
I use
# Contours take their name from the elevation setting.
contour=elevation & ele ~ '\d*[02468]00'
{ name '${ele|conv:m=>ft}'; }
[0x22 resolution 18]
contour=elevation & ele ~ '\d+[05]0'
{ name '${ele|conv:m=>ft}'; }
[0x21 resolution 21]
contour=elevation
{ name '${ele|conv:m=>ft}'; }
[0x20 resolution 23]
for this purpose.
Currently, the internal generation of contour lines can only cope with
maps fitting into a single data tile. It can read SRTM geotiffs, ASTER
geotiffs and HGT files. I use the following options:
--contours
--dem-type=ASTER
--dem-increment=20
--dem-maxlevels=200
--dem-path=ASTER
Hope that helps
Christian
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