Hi to all
because I need polygons with a counterclockwise-orientation (and their holes in clockwise direction) I have dealt with the extension SFCGAL and ST_ForceLHR. A few questions have emerged ...
1.
I have updated postgis to 2.2.0 and installed the PostGIS extension postgis_sfcgal. According to the documentation I can switch between sfcgal postgis.backend / postgis.backend geos. Why is it possible to run sfcgal functions even when I specify explicitly geos as backend? And which version of the mentioned function is then used (sfcgal, geos)? "Some SFCGAL functions replace standard ones (ST_Intersects, ST_Intersection, ST_Difference, ST_Union, ST_Area and ST_Distance)"
2.
2.
Why is it not possible to use the functions ST_ForceLHR / ForceRHR on geography?
3.
3.
Why is the orientation of the "holes" in polygons using ST_ForceRHR considered, but not when using ST_ForceLHR? --> Is there an easy way to change that or a workaround?
4.
4.
Why does ST_ForceRHR work only with polygons and not as ST_ForceLHR also with multipolygons?
The Version I am using:
PostgreSQL 9.3.5, compiled by Visual C++ build 1600, 64-bit on Windows
Postgis 2.2.0
Biggest Problem of all:
If I use ST_ForceLHR with a bigger polygon or a multipolygon postgresql crashes and is not able to recover because of a “pre-existing shared memory block is still in use”
LOG: server process (PID 30468) was terminated by exception 0xC00000FD
DETAIL: Failed process was running: SELECT xy(4056532,12283) <-- Function including ST_ForceLHR
HINT: See C include file "ntstatus.h" for a description of the hexadecimal value.
LOG: terminating any other active server processes
…
postgres@Test FATAL: the database system is in recovery mode
LOG: all server processes terminated; reinitializing
FATAL: pre-existing shared memory block is still in use
HINT: Check if there are any old server processes still running, and terminate them.
Any help will be great!!
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