Re: [NTG-context] mp-geo Metapost package with ConTeXt

17 Jul 2021

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Am 17.07.2021 um 12:45 schrieb Hans Hagen :
On 7/17/2021 12:20 PM, Henning Hraban Ramm wrote:
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Am 17.07.2021 um 11:53 schrieb Bruce Horrocks :
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On 16 Jul 2021, at 20:55, Hans Hagen  wrote:
On 7/15/2021 10:30 PM, Bruce Horrocks wrote:
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On 15 Jul 2021, at 18:58, Hans Hagen  wrote:
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I was wondering about that too. I admit that I looked into maps years ago but never could find quality data files.
Does this help?
https://www.naturalearthdata.com
i was halfway writing as reader for that fiel format when i noticed that is is also quite low res so i gave up on that and started playing (extending) with an more interesting alternative that mojca and i wrote years ago at a meeting
Off the top of my head I'm not aware of any higher resolution sources of global data - what scale were you thinking of?
Can you work with OpenStreetMap data?
https://planet.openstreetmap.org
http://download.geofabrik.de
https://download.bbbike.org/osm/
I didn’t find excerpts that only have e.g. country borders or rivers. But with usual XML tools you could extract those.
Indeed, that is what I was referring too. Mojca found this:
 https://osm-boundaries.com/
Ah, our mails crossed...
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At a bachotex meeting (years ago, when the ctx group donated a nice roadmap display to the conference) we made an openstreetmap -> metapost style but afaik that never made it into a module. So, when I remembered that I updated it. I can now render my hometown (need to figure out colors) quite okay. (One can export an osm file in openstreetmap but with some limitations on size.)
I have to play a bit more with the style before I define it useable but the interface is liek this:
% where i live
\startMPpage
   draw lmt_openstreetmap [
       filename = "hasselt.osm"
       grid     = "dots",
   ] ;
\stopMPpage
% island in paris
\startMPpage
   draw lmt_openstreetmap [
       filename = "e:/tmp/map.osm"
   ] ;
\stopMPpage
The hasselt osm file is sime 12 MB, the colorful hasselt pdf file just below 1 MB so that's okay (3.7 sec processing time on my machine so if all claims are right sub seconds on a fast new apple).
Of course I need to make colors and what gets rendered configurable (via the interface). It's more about the fun aspect .. no need to typeset complete routes because that's what the web is for.
For our architectural guides I make maps with OSM data and Maperitive. It’s a PITA (sooo slow with Mono on OSX and hadly documented), but works.
Maperitive uses "mrules" style files (example attached).

[call]

mono --desktop Maperitive/Maperitive.Console.exe -defaultscript=false ../baukultur.mscript
inkscape -z -f citymap.svgz -A citymap.pdf

[baukultur.mscript]

set-setting name=map.decoration.attribution value=false
set-setting name=map.decoration.grid value=false
set-setting name=map.decoration.scale value=false
set-setting name=map.rendering.font-family value="AlegreyaSans"

use-ruleset location=Maperitive/Rules/baukultur.mrules
// load some additional data, e.g. markers
load-source archiguide.osm
// exported OSM city map
load-source bonn.osm

// Stadthalle BG
move-pos y=50.68064 x=7.15849 zoom=17
set-home
set-geo-bounds 7.153,50.6840,7.162,50.6772
set-print-bounds-geo 7.153,50.6840,7.162,50.6772
export-svg file=citymap.svgz compatibility=inkscape map-scale=5000

Hraban