Re: [mkgmap-dev] r4015 in dem-tdb branch implements --x-overview-dem-dist
Hi Gerd, This is regarding hillshade still being rendered even if the area was excluded in the osm file. As an example, I specifically removed borneo island in the southwest but DEM still showed up. https://www.dropbox.com/s/m6pdz90d3jo1unq/borneo.jpg?dl=0 Ervin M. *Schadow1 Expeditions* - A Filipino must not be a stranger to his own motherland. http://www.s1expeditions.com On Sat, Dec 23, 2017 at 4:08 PM, Gerd Petermann < gpetermann_muenchen@hotmail.com> wrote:
Hi Ervin,
I think there is no longer a need to change splitter since DEM files are allowed to grow > 16MB with r4016. Just to make that clear: When I write about DEM files I mean the files in the Garmin DEM format, they are either contained in a *.img or in a *.DEM, and they contain the text "GARMIN DEM". I guess DEM means something like "Digital Elevation Model". Besides that I don't understand what you mean. Is it about the contour lines created by tools like srtm2osm or phyghtmap? What could be improved in splitter?
Gerd
________________________________________ Von: ebmalicdem@cxsmedia.com <ebmalicdem@cxsmedia.com> im Auftrag von Ervin Malicdem <schadow1@gmail.com> Gesendet: Samstag, 23. Dezember 2017 06:21:36 An: Development list for mkgmap; gpetermann_muenchen@hotmail.com Betreff: Re: [mkgmap-dev] r4015 in dem-tdb branch implements --x-overview-dem-dist
Getting better each time! Great! A suggestion once you will be working with splitter is for the dem to be cut using a poly file as well.
Ervin M. Schadow1 Expeditions - A Filipino must not be a stranger to his own motherland. http://www.s1expeditions.com
On Sat, Dec 23, 2017 at 12:11 AM, Gerd Petermann < GPetermann_muenchen@hotmail.com<mailto:GPetermann_muenchen@hotmail.com>> wrote: Hi,
okay, so we now have three new (still undocumented options) to enable hillshading and calculation of elevation data in routes. Here is a summary of the new options:
--x-dem=path_to_dir[,path_to_other_dir,...] gives one or more directories containing *.hgt files. --x-dem-dists=n1,n2,n3,... Sample from a Garmin Demo map: --x-dem-dists="5520, 16560, 44176, 88368" should contain one number for each level in case you want to use the DEM data in a gmapsupp, the values give the number of DEM units between two points. A DEM unit is 360° / 2 ^32. The higher the numbers the smaller the DEM file. Useful values for level 0 start at 1600 if you have 1'' hgt data and a small area, for large areas consider to use 8000 or more. If this option is missing mkgmap will calculate one DEM level based on the resolution of the hgt files. --x-overview-dem-dist=n Use this option to add DEM also to the overview map. The value again gives the distance between two DEM points. It the option is not given or the value is 0 the creation of DEM data for the overview map is disabled. This might be needed for large areas and for overview img files which are already close to 16MB . Useful are probably values > 100000, e.g. 256000
Expect to see "There is not enough room in a single garmin map for all the input data. The .osm file should be split into smaller pieces first." when experimenting with these options. The additional amount of bytes for the DEM files depend on the above options, and the relief of the area. Mountains require much more space compared to flat areas like the netherlands. If you have contour lines in your overview map try without.
I'll try to add code to splitter so that it creates smaller tiles for areas with many mountains. I don't know yet how to store that info.
Gerd _______________________________________________ mkgmap-dev mailing list mkgmap-dev@lists.mkgmap.org.uk<mailto:mkgmap-dev@lists.mkgmap.org.uk> http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
Hi Gerd, Thanks for the good work to implement DEM into mkgmap! I have tested a few tiles, I noticed that BuildDEMFile with--dlon=0.00027761 has a much more detailed relief than the default values x-dem-dists=5520, 16560, 44176, 88368 How can I get the same results as with dlon=0.00027761?
Hi, Gerd has published formula for his parameters, you have to multiply your dlon by 2^32/360. Value dlon=0.00027761 is equivalent of about x-dem-dists=3313. Basically 1" arc DEM ~ 3314, 3" arc DEM ~ 9942. Or so I hope, I haven't tested. -- Best regards, Andrzej
Hi, it would be my expected behaviour if you just delete the OSM data and keep the area still in your map area. Henning Sent from BlueMail On 23 Dec 2017, 10:12, at 10:12, Ervin Malicdem <schadow1@gmail.com> wrote:
Hi Gerd,
This is regarding hillshade still being rendered even if the area was excluded in the osm file. As an example, I specifically removed borneo island in the southwest but DEM still showed up.
https://www.dropbox.com/s/m6pdz90d3jo1unq/borneo.jpg?dl=0
Ervin M. *Schadow1 Expeditions* - A Filipino must not be a stranger to his own motherland. http://www.s1expeditions.com
On Sat, Dec 23, 2017 at 4:08 PM, Gerd Petermann < gpetermann_muenchen@hotmail.com> wrote:
Hi Ervin,
I think there is no longer a need to change splitter since DEM files are allowed to grow > 16MB with r4016. Just to make that clear: When I write about DEM files I mean the files in the Garmin DEM format, they are either contained in a *.img or in a *.DEM, and they contain the text "GARMIN DEM". I guess DEM means something like "Digital Elevation Model". Besides that I don't understand what you mean. Is it about the contour lines created by tools like srtm2osm or phyghtmap? What could be improved in splitter?
Gerd
________________________________________ Von: ebmalicdem@cxsmedia.com <ebmalicdem@cxsmedia.com> im Auftrag von Ervin Malicdem <schadow1@gmail.com> Gesendet: Samstag, 23. Dezember 2017 06:21:36 An: Development list for mkgmap; gpetermann_muenchen@hotmail.com Betreff: Re: [mkgmap-dev] r4015 in dem-tdb branch implements --x-overview-dem-dist
Getting better each time! Great! A suggestion once you will be working with splitter is for the dem to be cut using a poly file as well.
Ervin M. Schadow1 Expeditions - A Filipino must not be a stranger to his own motherland. http://www.s1expeditions.com
On Sat, Dec 23, 2017 at 12:11 AM, Gerd Petermann <
GPetermann_muenchen@hotmail.com<mailto:GPetermann_muenchen@hotmail.com>>
wrote: Hi,
okay, so we now have three new (still undocumented options) to enable hillshading and calculation of elevation data in routes. Here is a summary of the new options:
--x-dem=path_to_dir[,path_to_other_dir,...] gives one or more directories containing *.hgt files. --x-dem-dists=n1,n2,n3,... Sample from a Garmin Demo map: --x-dem-dists="5520, 16560, 44176, 88368" should contain one number for each level in case you want to use the DEM data in a gmapsupp, the values give the number of DEM units between two points. A DEM unit is 360° / 2 ^32. The higher the numbers the smaller the DEM file. Useful values for level 0 start at 1600 if you have 1'' hgt data and a small area, for large areas consider to use 8000 or more. If this option is missing mkgmap will calculate one DEM level based on the resolution of the hgt files. --x-overview-dem-dist=n Use this option to add DEM also to the overview map. The value again gives the distance between two DEM points. It the option is not given or the value is 0 the creation of DEM data for the overview map is disabled. This might be needed for large areas and for overview img files which are already close to 16MB . Useful are probably values > 100000, e.g. 256000
Expect to see "There is not enough room in a single garmin map for all the input data. The .osm file should be split into smaller pieces first." when experimenting with these options. The additional amount of bytes for the DEM files depend on the above options, and the relief of the area. Mountains require much more space compared to flat areas like the netherlands. If you have contour lines in your overview map try without.
I'll try to add code to splitter so that it creates smaller tiles for areas with many mountains. I don't know yet how to store that info.
Gerd _______________________________________________ mkgmap-dev mailing list mkgmap-dev@lists.mkgmap.org.uk<mailto:mkgmap-dev@lists.mkgmap.org.uk> http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
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participants (5)
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Andrzej Popowski -
Arndt Röhrig -
Ervin Malicdem -
Henning Scholland -
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