Hi!
I've been extensively testing some problematic issues with the buffer function using PostGIS. Seems that in some cases interior rings are not being used to perform the
inner buffer generation although for most of the cases rings are correctly used.
I was able to assemble some xml files from my test data (used a simple
script to generate this files based on PostGIS' results) and I ran them through the
XMLTester for GEOS and also for JTS. The results can be observed in the
attached files. Seems like there is a high error rate when using st_buffer (for both
inner and outer rings) and that JTS has got a more conservative error detection
approach (?) compared to GEOS.
I originally filed this error in PostGIS' error tracking system but they recommended to post the test results here.
