[postgis-users] Aggregating CAD lines to a single polygon?

[Stefan Keller]

Yep. That's a cool function.
Must be part of the feature frenzy I missed :-)
Have to upgrade first.

:S

2015-10-06 23:23 GMT+02:00 Paul Ramsey <pramsey at cleverelephant.ca>:
> Something like
>
> http://postgis.net/docs/manual-dev/ST_ClusterWithin.html
>
> If you use PostGIS 2.2?
>
> P
>
> On Tue, Oct 6, 2015 at 1:43 PM, Stefan Keller <sfkeller at gmail.com> wrote:
>> Hi
>>
>> I got a CAD dataset of crossroads where - you won't believe it - every
>> single road marking was captured by a closed line! This means, that
>> there are about 10 marking outlines with a 0.5m gap which make up one
>> single crossroad on the street.
>>
>> Now, what I need is just the center point for each crossroad.
>>
>> My approach:
>> 1. calculate a buffer of ~0.6m around each line,
>> 2. dissolve overlapping geometries (=> (ST_Dump(ST_Union(geom))).geom ?),
>> 3. calculate centroid of resulting polygon.
>>
>> Any other ideas?
>>
>> :Stefan
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