Going a step further:
st_longestline(st_collect(the_geom),st_collect(the_geom))
gives the longest line segment that can be drawn within the cluster of
street address points. Works for non-curved streets. I'm still looking
for a more intelligent way to thin out a polygon to a (multi)line.
Jan
On 02/21/2012 05:27 PM, Fawcett, David (MPCA) wrote:
If you are storing the data in PostGIS, you could possibly take
advantage of ST_Azimuth(). http://www.postgis.org/docs/ST_Azimuth.html
It takes two point objects as the args, but you could potentially use
the start and end points of your linestring.
David.
*From:*[email protected]
[mailto:[email protected]] *On Behalf Of *Jan
Hartmann
*Sent:* Tuesday, February 21, 2012 10:23 AM
*To:* [email protected]
*Subject:* [mapserver-users] Aligning labels within a polygon
Hi,
I'm inputting lots of street address points in PostGIS, and try to
generate labels for the streets. The convex hull of the points of a
street approximate the course of the street, and I would like to
position the streetname in the middle of the convex hull polygon,
aligned to its dominant angle (the polygons are generally quite
narrow). Is there a way of doing this with MapServer? Perhaps by
thinning out the polygon to a line, for then I can use "angle follow".
Jan
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