[SQLGRASS] postgres vector buffering works as v.buffer

[Alex Shevlakov]

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Hi, GRASS developers and users,

more info on Postgresql 2-d vector functions development.

I just updated this page to contain new descriptions:

http://motivation.ru/grass/buff_q_example.html

Generally, Postgres makes possible vector buffer spatial queries
and producing the buffer lines (which is a bit more intricate than just que=
rying if point is within buffer).
As there has been no 'v.buffer' yet, I think this must help those who want
making the buffer lines directly from vectors.

I think about more updates to the library that is dynamically loaded
(and reloaded with backend restart..(:(). One thing I do not think is
worth doing is 'v.in.pg' module which could do the backward vector
to GRASS from Postgres. It's because of the same as 'v.in.shape' problem wi=
th
double segments parts of various rings, and also because there is a simple =
and more reliable way, AFAIC, the v.in.arc would do the rest after dump of =
the necessary vector to 'ungenerate' format. For this I just added a simple=
 dumper function.

=20
Best wishes,

--alex

Alex Shevlakov,
Motivation Free Software consulting,
Moscow, Russia.
sixote@yahoo.com

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