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[mkgmap-dev] Problems with contours

From Gerard Cattiaux gerard-mkgmap at gmx.com on Mon Apr 10 09:42:44 BST 2023

Hi Diego,


I had a very similar issue when I used the same procedure : Hgt2osm then
mkvmerge, etc..

(see https://www.mkgmap.org.uk/pipermail/mkgmap-dev/2022q1/033808.html )


To solved the issue, I change all my procedure to have perfect contourlines,
avoiding mainly to use mkvmerge.

First :

>From all hgt xxxxxx.hgt files I generate the corresponding xx.osm.gz files
with Hgt2osm (to be adapted)

"hgt2osm –-HgtPath=E:\Gps-Topo\00-Convers-MAN-Contours-Hgt-Osm\HGT-AFAIRE
--MinBoundingbox=0.00016 --DouglasPeucker=0.12 --OutputOverwrite=false
--MinorDistance=5 --MaxThreads=30"




1) I splitt all xx.osm.gz with splitter(to be adapted) :


CMD /K java -XmxNNNNNm -jar e:\Gps-Topo\splitter\splitter.jar
--keep-complete=false --mapid=85000001 --max-nodes=2100000
es.poly --output-dir=e:\Gps-Topo\01-Contours-5m-Split\


2) Then, I use mkgmap to produce contourlines (to be adapted)


CMD /c Java -Xmx11000m -ea -jar e:\Gps-Topo\mkgmap\mkgmap.jar --latin1
--transparent --mapname=85000001 --show-profiles=0
--read-config=E:\Gps-Topo\HGT\listedem --dem-dists=5520
oly --style-file=e:\Gps-Topo\mkgmap\perso.zip --gmapsupp -c template.args


Best Regards,




De : mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> De la part de
helter skelter
Envoyé : jeudi 30 mars 2023 17:36
À : mkgmap-dev at lists.mkgmap.org.uk
Objet : [mkgmap-dev] Problems with contours


Hello guys

I don't know if this is the right place to ask: please forgive me if not and
delete my request.

I have a problem with contours, generated from DEM HGT files, downloaded
both from Nasa and Viewfinder, and tried with different Douglas-Peucker

I get empty spaces in some areas of the map, close to the state/region
border, and squares with no DEM data, as you can see in this picture (this
is the north part of Trentino Alto Adige, north of Italy):


I use HGT2OSM and OSMCONVERT to process all HGTs and obtain a single OSM
file, the I split it with the Splitter.

Then I merge everything in a single IMG file with MKGMAP.


Do you know what could be the reason of this problem and how to solve ?


Thank you in advance for all your help





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