[mkgmap-dev] Include the following patches into trunk -- Patch1 - Drop small Polygons

Tue Mar 1 18:55:36 GMT 2011

Am 01.03.2011 19:47, schrieb Felix Hartmann:
> On 01.03.2011 19:44, Henning Scholland wrote:
>> Am 01.03.2011 19:38, schrieb Felix Hartmann:
>>> On 01.03.2011 19:33, Felix Hartmann wrote:
>>>> The following patches are in my eyes really worthwhile and should be
>>>> added to trunk. They all work fine without glitches.
>>>>
>>>> 1. Drop small Polygons
>>>> I am not sure who wrote this patch, but I have been using it longtime
>>>> and it certainly does improve map performance especially on higher
>>>> resolutions.
>>>> It removes all polygons which consist of less than 8 pixels.
>>>>
>>>> If you deem that this is too extreme (though 8 pixels is really
>>>> nothing, and polygons of less than 8 pixel size are barely noticeable
>>>> anyhow - and only slow down map drawing) the following line could be
>>>> reduced to maybe 6 or 4 pixels:
>>>> +    private static final int MIN_SIZE_POLYGON = 8;
>>> Ups forgot to say, I'm actually using it with a value of 15 and it seems
>>> to work pretty well with 15.
>> Wont it cause routing errors, if little highway-areas will be removed?
>>
>> Henning
> What do you mean by highway areas? I removes lines consisting of 1 point
> but but not on the routing nodes, but only on visual display. A 1point
> line cannot exist in resolution 24 but only in resolutions 23 down.
> Neither in Mapsource nor on GPS I can see a difference of removing 1
> point lines (yes there is a visual difference if removing polygons
> smaller than 15 pixels, but that usually makes the map better readable,
> 15 pixels is still tiny and causes rather a better readable map because
> small non identifiable crap gets removed).
I thought about small polygons with highway-tag. If these polygons gets 
removed, there will be a gap. Or did I misunderstood your mail and these 
polygons will only be removed from drawing but not from routing part of 
the map?

Henning