Dear All,
is there a function to easily subtract a polygon from a polygon. Both
are rectangles.
The scenario:
Two overlapping polygons identified by ST_INTERSECTS.
Creating a third one from the overlapping area via ST_INTERSECTION.
Subtract the overlap from the two initial polygons. Which
Thank you very much Maxime.
I knew there was a function like this, just could not remember the name.
Regards
Jan
On 02.11.2010 14:01, Maxime van Noppen wrote:
Hi,
ST_Difference does the trick.
http://postgis.refractions.net/docs/ST_Difference.html
Dear All,
when trying to insert a polygon into a table from a plperl script by
this command:
my $new_poly = spi_exec_query(INSERT INTO polys1(id,poly)
VALUES($new_id, ST_MakeEnvelope($xmin, $ymin , $xmax, $ymax, 31467)););
I get a
new row for relation »polys1« violates Check-Constraint
Never mind, problem solved.
An ST_WITHIN check kindly helped me figured it out. The problem was not
that it was not a polygon. The problem was, one was inside the other one.
Regards
Jan
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Thank you Mike, you were absolutely right.
Now I am running into yet another problem with the box3d objects.
This command works fine:
INSERT INTO metadaten(box)
VALUES('BOX3D(3435970 5962930 -16.45,3439110 5967300 -3.28)'::BOX3D)
WHERE id=111;
When I try to do the same thing from within a
will I lose data/precision if I save the box3ds as text first and once
they are all in the column cast them to box3d? That operation would be
purely inside the database and should work. should it?
Regards
Jan
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Hi all,
what is the geometry type to chose when storing BOX3D type geometries?
Of what type does the column need to be? I mean how do I phrase this
correctly?
---
postgisdb=# SELECT AddGeometryColumn('boxes','box3d',31467,'BOX',3);
FEHLER: Invalid type name - valid ones are:
POINT,
Hi all,
on my journey to learning PostgreSQL and PostGis I am now trying to
write a function in pl/pgsql. In this little program I would like to
determine the frequency of different x-values of POINT3D objects to
get an idea about how many rows were digitized.
Therefore I would like to
Hi List,
how do I check if two 3d-point sets overlap? I see the operator
should be able to compare the bounding boxes, but how do I do it? I
can not get the or ST_Intersects function to work. Here is what I
am trying to do:
SELECT ST_Collect(pkt) FROM pktbsp ST_Collect(pkt) FROM
(pkt) as second_set from pktbsp2) y;
That will return a single row with a single column: t or f.
Hope that helps,
aman
-Original Message-
From: postgis-users-boun...@postgis.refractions.net
[mailto:postgis-users-boun...@postgis.refractions.net] On Behalf Of
Jan Saalbach
Sent: August
Nicolas, thank you for your help. I have imported a set of points
using a python to psql script which filled a GeometryColumn using the
ST_MakePoint() function.
Now I would like to visualize the points using uDig. Since the set
imported is comprised of around 10 million points, drawing
thank you for your help. And yet I have another question. When I try
to insert my 3d points into a previously created, empty column it
seems only a 2d point is stored. Here is what I did via psql:
-
postgisdb=# INSERT INTO punkte (jan) VALUES (ST_makePoint(1.1,2.2,3.3));
INSERT 0 1
Nicolas,
you made my day. Absolutely amazing how fast and precise your help is.
Thank you very much.
Guess I will be using ST_AsEWKT() instead of the AsText function for now.
Thank you again.
Jan
Zitat von Nicolas Ribot nicolas.ri...@gmail.com:
Hello
st_astext is an OGC function
Dear all,
I am running into some troubles trying to install postgis 1.5.1. After
installation I followed the manual on which first steps to take. I
created a postgresql db and did the createlang part.
Now, when I enter psql -d postgisdb -f postgis.sql I get a
postgis.sql: No such file or
Thank you Edward. It worked.
Which now leads me to another question. I have datasets of the form x
y z. Which are location x,location y and elevation z to describe
different bathymetries . What is the smartes way to store them so they
can be easily worked with?
Regards,
Jan
Zitat von
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