[mkgmap-dev] length () in relations file

Mon Feb 25 21:02:19 GMT 2013

Hi Minko,

I think I found a formula to calculate the area size in a metric unit. 
But I have a problem to test that because I don't know the real area 
size of an OSM polygon.

Can anybody please send some way (polygon) ids with it's real world area 
size?

WanMil

> Hi Minko,
>
> It might be possible. The problem to be solved is that the garmin map
> geometry is not rectangular. So at the moment I don't know how the area
> size of a polygon can be calculated in a metric unit.
>
> WanMil
>
>> Can something like the length function also be implemented for polygons to render big lakes earlier?
>> For example
>> natural=water & area() > 10 [0x3c resolution 16]
>> natural=water [0x3c resolution 18]
>>
>> (gmaptool shows this area in sq km)
>>
>>
>>
>>>> There was a typo where it was checking if the function was supported
>>>> for
>>>> nodes instead of relations. Now fixed.
>>>>
>>>> ..Steve
>>>
>>> --
>>> keep on biking and discovering new trails
>>>
>>> Felix
>>> openmtbmap.org & www.velomap.org
>>>
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