[mkgmap-dev] Could mkgmap be extended to create an empty dem dist layer?

Wed Apr 18 20:46:51 BST 2018

Thanks a lot Gerd,
I hope I find soon some time to try it out on my devices (etrex 30, oregon
600)

On 18 April 2018 at 09:33, Gerd Petermann <gpetermann_muenchen at hotmail.com>
wrote:

> Hi Felix,
>
> attached is a patch that implements option --x-dem-empty-dist as discussed.
> I tried with
> --dem-dists=19884,39768,53024,106048  --x-dem-empty-dist=212096
> and found no visual effect, and with
> --dem-dists=19884,39768,53024  --x-dem-empty-dist= 106048
> the hill shading didn't work at all, and my Oregon froze when I tried to
> show the elevation data for a route.
>
> So, I've also tried with a different patch that writes height 0 instead of
> "undefined". This seems to work,
> but I am not sure if it shows the wanted effect. I've attached this 2nd
> version.
> Please try on your own.
>
> Gerd
>
> ________________________________________
> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von
> Felix Hartmann <extremecarver at gmail.com>
> Gesendet: Dienstag, 17. April 2018 12:59:41
> An: Development list for mkgmap
> Betreff: Re: [mkgmap-dev] Could mkgmap be extended to create an empty dem
>      dist layer?
>
> I prefer to have Basemap - but I know many people delete it by accident or
> don't activate it - and I just tried a gmapsupp DEM map will also give
> shading to overview map.
> And yeah - maybe call it
> --dem-empty-dist
>
> so you would have e.g.
> --dem-dists=19884,39768,53024,106048  --dem-empty-dist=212096
> or
> --dem-dists=19884,39768,53024  --dem-empty-dist= 106048
>
>
> not sure what values will work best. And yes I would expect only uknown or
> undefined heights should do the trick - but of course I do not know. With
> garmins usual approach i do guess it's possible to create it in a way that
> it switches off at some zoom level by inserting empty data.
>
> On 17 April 2018 at 12:40, Gerd Petermann <gpetermann_muenchen at hotmail.com
> <mailto:gpetermann_muenchen at hotmail.com>> wrote:
> Hi Felix,
>
> it should be easy to add an empty layer, but I'd prefer a special option
> for that.
> Any ideas for a good option name?
> I guess an empty layer would be one that contains only "unknown" or
> "undefined" heights.
> No idea what the device will do with such a layer, I'll try it.
> If I got you right you prefer to have no basemap on your device? Or maybe
> some devices don't have
> one by default?
>
> Gerd
>
> ________________________________________
> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk<mailto:mkgmap-
> dev-bounces at lists.mkgmap.org.uk>> im Auftrag von Felix Hartmann <
> extremecarver at gmail.com<mailto:extremecarver at gmail.com>>
> Gesendet: Dienstag, 17. April 2018 11:50:42
> An: Development list for mkgmap
> Betreff: [mkgmap-dev] Could mkgmap be extended to create an empty dem
> dist      layer?
>
> If compiling DEM gmapsupp.img for device, right now it will show forever
> when zooming out - it would be good to have a fake/empty dem top layer - say
> --dem-dists=19884,39768,53024,212096
> with 212096 being empty or just having enough data that the device is not
> actually shading the map?
>
> Basically I think dem on device is only useful from around 5-30km zoom
> levels (with default detail level). 5km is the lowest that the devices
> choose if DEM is on auto zoom level, but it will continue showing it
> indefinitely (at least if no basemap is activated) - so getting the device
> to show an empty dem to switch of shading would be pretty useful.
>
> Greetings
> Felix
>
> --
> Felix Hartman - Openmtbmap.org & VeloMap.org
> Schusterbergweg 32/8
> 6020 Innsbruck
> Austria - Österreich
> _______________________________________________
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>
>
>
> --
> Felix Hartman - Openmtbmap.org & VeloMap.org
> Schusterbergweg 32/8
> 6020 Innsbruck
> Austria - Österreich
>
> _______________________________________________
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> mkgmap-dev at lists.mkgmap.org.uk
> http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
>

-- 
Felix Hartman - Openmtbmap.org & VeloMap.org
Schusterbergweg 32/8
6020 Innsbruck
Austria - Österreich
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