[mkgmap-dev] Tiles pruned in DEM map

Thu Dec 17 22:44:20 GMT 2020

I build several types of map (OSM, OSM+contour lines, maps for trucks 
and OSM+DEM) for the same area, using same input files. I split 
country.o5m with splitter and then use the same template.args output by 
splitter for all maps, just changing mapname for the different types of 
map. Given that, all resulting mapsets should have the same tiles, but 
tiles in DEM map are smaller than in the other types. They share part of 
the boundaries (usually two of them) with other types, but other 
boundaries are moved in, reducing displayed tile size. See attached 
screenshots. However, file size is the same (discounting *.DEM) for each 
tile in *.gmap subfolders.

Command is quite similar for OSM and OSM+DEM maps:

java -Xmx27G -ea -Dlog.config=logging.properties -jar mkgmap.jar -c 
opciones_comunes $CODEPAGE --gmapi --bounds=bounds.zip 
--precomp-sea=sea.zip --route --country-name=$PAIS --country-abbr=${ABR} 
--area-name=$MAPA --family-name="OpenStreetMap $MAPA" 
--family-id=1${FID} --product-version=$VERSION --series-name="OSM-$MAPA" 
--overview-mapname=${ABR}1${FID} --overview-mapnumber=${GRUPO}1${FID}000 
--name-tag-list=$NAMETAG --process-destination --process-exits 
--housenumbers --reduce-point-density=4 --polygon-size-limits="24:12, 
18:10, 16:0" --order-by-decreasing-area --add-pois-to-areas 
--report-similar-arcs --report-dead-ends=2 --link-pois-to-ways 
--location-autofill=is_in,nearest --drive-on=detect,$DRIVEON 
--check-roundabouts --check-roundabout-flares --license-file=license_OSM 
--copyright-file=copyright $LANGUAGE --road-name-config=${CONFIG} 
--style=mio --check-styles -c $pais.args tmp/${ABR}1${FID}.txt

java --Xmx27G -ea -Dlog.config=logging.properties -jar mkgmap.jar 
--dem=hgt/LIDAR,hgt/ALOS,hgt/VIEW1,hgt/SRTM1,hgt/EU-DEM,hgt/VIEW3,hgt 
--dem-poly=polygons/$pais.poly --dem-dists=3312,6624,9936,13248,26512 
--overview-dem-dist=128000 -c opciones_comunes $CODEPAGE --gmapi 
--show-profiles=1 --bounds=bounds.zip --precomp-sea=sea.zip --route 
--country-name=$PAIS --country-abbr=${ABR} --area-name="$MAPA" 
--family-name="OSM $MAPA DEM" --family-id=5${FID} 
--product-version=$VERSION --series-name="OSM-$MAPA-DEM" 
--overview-mapname=${ABR}5${FID} --overview-mapnumber=${GRUPO}5${FID}000 
--name-tag-list=$NAMETAG --process-destination --process-exits 
--housenumbers --reduce-point-density=4 --polygon-size-limits="24:12, 
18:10, 16:0" --order-by-decreasing-area --add-pois-to-areas 
--link-pois-to-ways --location-autofill=is_in,nearest 
--drive-on=detect,$DRIVEON --check-roundabouts --check-roundabout-flares 
--license-file=license_OSM_${HGT} --copyright-file=copyright $LANGUAGE 
--road-name-config=${CONFIG} --style=mio --remove-ovm-work-files=true -c 
${pais}-DEM.args tmp/${ABR}5${FID}.txt

Both OSM and OSM+DEM maps can be downloaded from 
https://alternativaslibres.org/en/downloads.php#Oceania

Any idea why this happens?

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