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 values. 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): [cid:7f488b98-a01f-4538-bd2a-fe8ca3b4d4fa] 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 Regards, Diego
You need to voidfill the hgt files first On Mon, Apr 10, 2023, 04:38 helter skelter <hskelter@hotmail.com> wrote:
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 values. 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 Regards, Diego
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Hi Diego can you tell us the options of your tools, especially for Splitter. Did you use you shape files to cut off the data? BTW: i cut my DEM files with the polygone files from the Geofabrikm they have a small overhang the edges, that prevent data loses. Bernd Am Donnerstag, 30. März 2023, 17:36:25 CEST schrieb helter skelter:
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 values. 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): [cid:7f488b98-a01f-4538-bd2a-fe8ca3b4d4fa]
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 Regards, Diego
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" After 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 --polygon-file=e:\Gps-Topo\00-Convers-MAN-Contours-Hgt-Osm\Contours-5m\limit es.poly --output-dir=e:\Gps-Topo\01-Contours-5m-Split\ e:\Gps-Topo\00-Convers-MAN-Contours-Hgt-Osm\Contours-5m\*.osm.gz 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 --dem-poly=e:\Gps-Topo\00-Convers-MAN-Contours-Hgt-Osm\Contours-5m\limites.p oly --style-file=e:\Gps-Topo\mkgmap\perso.zip --gmapsupp -c template.args *.pbf Best Regards, Gerard De : mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> De la part de helter skelter Envoyé : jeudi 30 mars 2023 17:36 À : mkgmap-dev@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 values. 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 Regards, Diego
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" After 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 --polygon-file=e:\Gps-Topo\00-Convers-MAN-Contours-Hgt-Osm\Contours-5m\limit es.poly --output-dir=e:\Gps-Topo\01-Contours-5m-Split\ e:\Gps-Topo\00-Convers-MAN-Contours-Hgt-Osm\Contours-5m\*.osm.gz 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 --dem-poly=e:\Gps-Topo\00-Convers-MAN-Contours-Hgt-Osm\Contours-5m\limites.p oly --style-file=e:\Gps-Topo\mkgmap\perso.zip --gmapsupp -c template.args *.pbf Best Regards, Gerard De : mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> De la part de helter skelter Envoyé : jeudi 30 mars 2023 17:36 À : mkgmap-dev@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 values. 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 Regards, Diego
participants (5)
-
Bernd Weigelt -
Felix Hartmann -
Gerard Cattiaux -
grdctx＠gmx.com -
helter skelter