[GRASS-user] GRASS-module to import OSM-data

[Jannis Achstetter]

Hamish schrieb:
> [v.in.osm] (openstreetmap.org)
>
> Jannis Achstetter wrote:
>   
>> - You can let the script try to import "closed ways" as areas. There's
>> a little problem here:
>>     The script just checks, wether the first node of the first segment
>> (first means segment #1 of the way) and the last node of the last
>> segment (means segment with the highest number in that way) match.
>> This must be the case with closed ways but can occur with unordered
>> ways, too (Way: 3,4,5,1,2 for example). That's why "highway" and
>> "junction"-tagged ways are ignored at the area-check.
>>     
>
>
> Hi,
>
> what is a "closed way"? a series of segments forming a route?
> road-as-polygon?
>
>
> ??,
> Hamish
>   

No, not quite. A "series of segments forming a route" is a "way". You
speak about a "closed way" when the segments form a circle in the way
it's described in the OSM-wiki:

"Areas are the polygon of at least 3 segments in a row. The end of the
last segment has to connect to the start of the first."

The OSM-data-scheme doesn't really know "areas", so closed ways are used
to describe areas. There is a discussion wether the key "area" should be
defined to really make sure it's an area:
http://wiki.openstreetmap.org/index.php/Key:area

Jannis