[mkgmap-dev] Instructions to make contour maps

Wed Aug 19 09:08:32 BST 2009

On 08/19/2009 12:56 AM, Nolan Clifford wrote:

> I spent a lot of time today trying to figure out the above and did not  
> succeed.  Would anyone be willing to produce a step by step guide on  
> how to achieve it please?

I did it this way:

Create OSM file with contours:

mono Srtm2Osm.exe -large -cat 100 20 -step 10 -bounds1 10 20 30 40 -o srtm.osm

Split it with mkgmap splitter:

java -Xmx2048M -jar splitter.jar --mixed=yes --mapid=21000001 --mixed=yes
--max-nodes=5000000 srtm.osm

Then I made two sets of SRTM IMG files, one with 1 contour every 20 m (20 m,
40 m, 60 m, ...) and one with a contour every odd 10 m (10 m, 30 m, 50 m,
...). 'I used two mkgmap styles for that which contain just a "lines"file
with contour entries:

The 10 m "lines" file:
contour=elevation & contour_ext=elevation_minor
      { name '${ele|conv:m=>ft}'; } [0x20 resolution 23]

The 20 m "lines" file:
contour=elevation & contour_ext=elevation_medium
      { name '${ele|conv:m=>ft}'; } [0x21 resolution 22]
contour=elevation & contour_ext=elevation_major
      { name '${ele|conv:m=>ft}'; } [0x22 resolution 20]

I made two copies of the template.args file: template_srtm10.args and
template_srtm20.args. I edited these and put meaningful "description" into it.

For the SRTM 20 m I edited the template again and changed the input-file
sections from 21000XXX to 22000XXX.

java -Xmx2048M -jar mkgmap.jar --style-file=mkgmap-style-srtm10new \
  --net --gmapsupp --tdbfile --family-id=1234 --product-id=1 \
  --draw-priority=28 --transparent \
  --series-name=SRTM10 --family-name=SRTM10 --area-name=Foo \
  -c template_srtm10.args

Renamed the gmapsupp.img srtm10.img.
Renamed the 21000XXX OM files into 22000XXX.

java -Xmx2048M -jar mkgmap.jar --style-file=mkgmap-style-srtm20new \
  --net --gmapsupp --tdbfile --family-id=1235 --product-id=1 \
  --draw-priority=28 --transparent \
  --series-name=SRTM20 --family-name=SRTM20 --area-name=Foo \
  -c template_srtm20.args

Renamed the gmapsupp.img srtm20.img.

At last I glued the maps together with my OSM IMG and the TYP file with
gmaptool:

wine gmt.exe -j -o srtm_osm.img osm.img srtm20.img srtm10.img mytypfile.typ