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[mkgmap-dev] r4015 in dem-tdb branch implements --x-overview-dem-dist

From Henning Scholland osm at hscholland.de on Sat Dec 23 11:23:58 GMT 2017

it would be my expected behaviour if you just delete the OSM data and keep the area still in your map area. 


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On 23 Dec 2017, 10:12, at 10:12, Ervin Malicdem <schadow1 at 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
>DEM still showed up.
>Ervin M.
>*Schadow1 Expeditions* - A Filipino must not be a stranger to his own
>On Sat, Dec 23, 2017 at 4:08 PM, Gerd Petermann <
>gpetermann_muenchen at hotmail.com> wrote:
>> Hi Ervin,
>> I think there is no longer a need to change splitter since DEM files
>> 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
>> something like "Digital Elevation Model".
>> Besides that I don't understand what you mean. Is it about the
>> lines created by tools like srtm2osm or phyghtmap?
>> What could be improved in splitter?
>> Gerd
>> ________________________________________
>> Von: ebmalicdem at cxsmedia.com <ebmalicdem at cxsmedia.com> im Auftrag von
>> Ervin Malicdem <schadow1 at gmail.com>
>> Gesendet: Samstag, 23. Dezember 2017 06:21:36
>> An: Development list for mkgmap; gpetermann_muenchen at 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
>> 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 at hotmail.com<mailto:GPetermann_muenchen at 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,
>> should contain one number for each level in case you want to use the
>> data in a gmapsupp, the values give
>> the number of DEM units between two points. A DEM unit is 360° / 2
>> 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
>> the distance between two DEM points.
>> It the option is not given or the value is 0 the creation of DEM data
>> 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
>> the DEM files depend on the above options, and the relief of the
>> 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
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