[mkgmap-dev] DEM contrast option?

Mon Jul 9 16:29:14 BST 2018

Hi Jan,

to be honest, I don't even understand how you produce the two different screen shots. If you prefer one of the two,
why/when do you use the other?

Gerd

________________________________________
Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von jan meisters <jan_m23 at gmx.net>
Gesendet: Montag, 9. Juli 2018 16:25
An: Development list for mkgmap
Betreff: Re: [mkgmap-dev] DEM contrast option?

Which resolution exactly do you mean?
I already described that I tried different values for dem-dists (including one single resolution).
This, of course, has a huge effect on DETAILS, but not on CONTRAST.

Anybody has an idea how to adjust contrast?

Am 05.07.2018 um 20:20 schrieb Felix Hartmann <extremecarver at gmail.com<mailto:extremecarver at gmail.com>>:

You should only use one single resolution

On Thu, 5 Jul 2018, 19:31 jan meisters, <jan_m23 at gmx.net<mailto:jan_m23 at gmx.net>> wrote:
Tried a lot of dem-dist variations: fixed resolution as you hinted, decreasing and even inverted steps.
Unfortunately nothing changed the shown behavior.

What I´d like to see is the same CONTRAST in the shading over all resolutions.
In higher resolutions the darks of the DEM are clearly brighter, whatever dem-dists used.
With the blank screenshots I wanted to show that there is no additional (higher resolution) polygon in my style eventually hiding the DEM.

Had some success (at least on DEM contrasts) mixing levels and overview-levels, but that obviously breaks the rest of the map.

Jan

Am 04.07.2018 um 21:14 schrieb Felix Hartmann <extremecarver at gmail.com<mailto:extremecarver at gmail.com>>:

if you have several dem resolution levels in mkgmap - then it will lose in detail (in order to zoom in/out faster). You could just create the map is a single dem resolution - then detail level is always the same.

On 4 July 2018 at 18:52, jan meisters <jan_m23 at gmx.net<mailto:jan_m23 at gmx.net>> wrote:
I just made my first map with the new DEM-option and I´m impressed. Pretty easy.
But I wonder why DEM shading looses contrast in higher resolutions in BaseCamp:

<1DEM_low.jpg><2DEM_higk.jpg>

My Style has background poly 4a and 4b (both transparent), however they are not mentioned in polygons. I wouldn´t know how to tag them anyway.
And even with a completely blanked typ-file the difference is visible:

<3DEM_low-e.jpg><4DEM_high-e.jpg>

HGT´s are 3“ data from viewfinderpanaramas.org<http://viewfinderpanaramas.org/>

To keep the contrasted DEM up to higher resolutions/zooms I played with all DEM-options from help, and also with transparencies, but that had no effect - the softer shading remains.

I see the switch in Basecamp somewhere between assumed resolutions 20 and 22.
How is this switch defined? Is there a value to adjust this?

Jan

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Felix Hartman - Openmtbmap.org<http://openmtbmap.org/> & VeloMap.org<http://velomap.org/>
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