On 28. 11. 11 04:59, Dane Springmeyer wrote:
On Nov 25, 2011, at 10:01 AM, yvecai wrote:
Given the speed of rendering with Geos' ST_OffsetCurve,
Slow or fast?
Slow. I used this on a smal DB (150Mo of osm file, ski pistes extracts),
here what I have from generate_image.py:
(select ST_OffsetCurve(way, 20) as way from planet_osm_line where route
IS NOT NULL) as pistes
real 0m50.163s
user 0m0.400s
sys 0m0.024s
With this to compare:
(select ST_Simplify(way, 10) as way from planet_osm_line where route IS
NOT NULL) as pistes
real 0m0.777s
user 0m0.380s
sys 0m0.028s
Anyway, an offset in geographic coordinates is not of great use in
Mapnik, thanks for taking time to provide something in pixels :)
Yves
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