[mkgmap-dev] [PATCH] --ignore-builtin-relations

Sun Apr 17 14:35:10 BST 2011

On Sun, Apr 17, 2011 at 11:45:40AM +0200, Josef Latt wrote:
>The multipolygons are drawn with ways without tags. Are they gone too 
>with this patch: When not how can I do this?

I'm not sure if it is sane to disable all multipolygon processing. With 
my patch, the multipolygon processing would be gone. In fact, in the 
posted form, all relations would be gone (see my earlier reply today for 
the right patch).

My intention is to disable the multipolygon and turn-restriction 
processing when processing additional layers. On my map, I would like to 
generate a map with the default style as the "main" map. All the "bells 
and whistles" would be enabled when generating the main layer.

On top of the map layer, I would generate a number of transparent 
layers:

* foot and hiking routes
* bicycle routes (lcn, ncn, etc.)
* bus routes
* rail routes (train, tram, subway)
* ferry routes
* ski routes (not sure if I am going to generate this for my map, but it 
should not be too much data)

I would not be generating road network relations, as I find them 
unnecessary clutter on the tiny GPS display. For the rare occasion when 
you want to follow a historic route or something, you can generate a 
special map containing just that route, or load the route in GPX format.

These layers would be enabled or disabled by the user when needed. Most 
of the time, it would make sense to enable the display of zero or one 
layers. The style rules for these layers are extremely simple: just one 
rule in the "relations" file and another in the "lines" file.

>> In other words, this looks like bad mapping. If you feed this to any
>> software, you can expect GIGO (garbage in, garbage out).
>
>ACK

BTW, I think that mkgmap should be able to complain something about the 
area. I generate the map of Finland almost every day and fix all mkgmap 
reported errors. Maybe you could start doing something similar in your 
home city, province or state (whole Germany would be too much for one 
person).

Best regards,

	Marko