Ok, here is a way to do it, but it seems a bit ridiculous to have to do a
2-part operation like this:
SELECT c.name, geomunion(the_geom) FROM
(SELECT name, ST_Buffer((ST_Dump(the_geom)).geom, .12) AS the_geom FROM
coastlines) c
WHERE c.name LIKE 'Papua%' GROUP BY c.name;
--
On Wed, Mar 25, 20
Hi Chris,
I don't think it's a linestring. I checked the sql load file I made, and
the table is defined in it as a MULTIPOLYGON:
SELECT AddGeometryColumn('','coastlines','the_geom','-1','MULTIPOLYGON',2);
Not really sure how else to test though.
--
On Wed, Mar 25, 2009 at 8:46 PM, Chris Herma
Will st_boundary() help? Perhaps in conjunction with st_buildarea() and
/ or st_polygonize()?
You may Roger André wrote:
> So I have a partial solution, but it creates another problem for me.
> I'm able to properly buffer all of the features in Papua New Guinea by
> doing an ST_Dump and blowing
So I have a partial solution, but it creates another problem for me. I'm
able to properly buffer all of the features in Papua New Guinea by doing an
ST_Dump and blowing apart the multipolygon, then buffering the individual
polygons:
SELECT name, ST_Buffer((ST_Dump(the_geom)).geom, .12) AS the_geo
I think it's a little easier than that. Use COUNT(DISTINCT somekey) to
count an record only once even when it is multiplied by the joining process.
SELECT a.district, count(DISTINCT b.gid) As num_disjoint
FROM planfile AS a INNER JON planfile AS b ON (a.district = b.district)
WHERE ST_Disjoin
This sounds to me like you might be buffering a linestring and not a
polygon. Is that possible? Ie are the countries represented as
outlines (linestrings) rather than polygons?
Roger André wrote:
> Hi All,
>
> I'm having some problems with features that are being returned from an
> ST_Buffer ope
Hi All,
I'm having some problems with features that are being returned from an
ST_Buffer operation in PostGIS. When I try to buffer the extents of Papua
New Guinea, a large region in the middle of its extents is omitted. You can
see a visual representation of this at
http://lagerratrobe.blogspot
Lee Meilleur wrote:
Hello,
I'm running a contiguity check using the ST_Disjoint function. The
results list the number of distinct polygons for a redistricting plan,
some disjoint and some touching on a corner. I need to distinguish
between the two and also show the total of all. To test
Hello,
I'm running a contiguity check using the ST_Disjoint function. The results
list the number of distinct polygons for a redistricting plan, some disjoint
and some touching on a corner. I need to distinguish between the two and also
show the total of all. To test this, I created a datase
Steve,
Well according to this its already 1 month behind, but I think you can
expect it within the next 2-3 months since it is almost in beta release now.
http://wiki.postgresql.org/wiki/PostgreSQL_8.4_Development_Plan
Bruce's note
http://momjian.us/main/blogs/pgblog.html#March_16_2009
Leo
---
I think you need to use " instead of '
Leo
-Original Message-
From: postgis-users-boun...@postgis.refractions.net
[mailto:postgis-users-boun...@postgis.refractions.net] On Behalf Of Travis
Kirstine
Sent: Wednesday, March 25, 2009 9:58 AM
To: PostGIS Users Discussion
Subject: [postgis-use
Mark,
Since everything you've described and should work, yes, in some matter
you're doing something wrong. But you haven't given enough details for
anyone to say exactly what. What commands are you running, start to
finish? What are the errors that you see?
P
On Wed, Mar 25, 2009 at 3:30 AM, Mar
Mark, Regina,
Thank you for your feedback.
I was struggling to get the postgresql-8.2 Debian source package to
build, finally got it in the wee hours of the morning. So that gives me
the option of staying on 8.2 that I was afraid I might not have.
Since this is a new system and only has a tr
I am trying to test a connection to a postgis db using ogrinfo and am
having difficulties. I am running the command on the same server that
hosts the postgis db. I checked the pg_hba.config file to see if it
allows local connections and everything looks OK but I still get
"Failure" when connecti
Yes, we use on that server very old PostGIS.
"POSTGIS="1.1.6" GEOS="2.2.3-CAPI-1.1.1" PROJ="Rel. 4.6.0, 21 Dec 2007"
USE_STATS"
The most important reason to repair these geometries is that we want to upgrade
to PostgreSQL 8.3 and current PostGIS. According to my tests, it is impossible
to dum
Ivan,
Which version of PostGIS are you running?
Do a:
SELECT postgis_full_version();
to have it return.
When I run your below query, it returns a polygon that looks like this
POLYGON((-266469.87 -1233431.41,-266423.25 -1233425.84,-266423.23
-1233426.17,-266422.74 -1233434.54,-266422.75 -123
Steve,
Just to add my 2 cents. I've been running 8.3 on 2 production systems
for about 6-8 months now. Aside from the index issue Mark already
mentioned, and also a bbox issue (with cached bboxes not always being
recalculated -- hmm I think this is fixed in 8.3.6 -- though I'll need
to verify)
On Wed, Mar 25, 2009 at 11:27:11AM +0100, Markus Schneider wrote:
> if a geometry is invalid, i.e. isvalid(geometry) equals false, is there a way
> to retrieve details about the errors that
> have been found?
Somebody recently added an isValidReason(geometry) IIRC.
--strk;
Free GIS & Flash co
Hello,
I've configured/compiled/installed PostGIS with GEOS, Proj, and pgsql.
But how do I get PostgreSQL to know the plug-in now exists? I've run
the SQL that creates the geometry_columns and all the geometry
functions, but yet whenever I run a query that involves a library
function from l
Dear list,
if a geometry is invalid, i.e. isvalid(geometry) equals false, is there a way
to retrieve details about the errors that
have been found?
For example, a polygon may intersect itself and contain rings that are not
closed. Most convenient would be a report
that lists all topological inc
Stephen Woodbridge wrote:
Hi all,
I have been holding back on upgrading my postgis installations from
postgresql 8.2 to 8.3 because:
1) it seemed like there was a lot of new postgresql stuff to figure out
in 8.3. What are the big changes I need to be aware of?
2) it seemed like there were
Thanks for Simon's blog, I have found very interesting things there.
I hope I understand what's going on in that function, but I always get
empty geometry result.
As test I tried following:
SELECT AsText(BuildArea(Collect(b.final_geom))) as filtered_geom
FROM (SELECT MakePolygon((/* Get outer r
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