> Mike Toews has suggested ST_Simplify or ST_SimplifyPreserveTopology, but
I'm unsure of what value to use for the tolerance. The CRS is geographic,
not projected.
Simplifying in geographic never works well. What we usually do is pick a
projected unit simplify in that and then convert back
Thanks heaps!
Puthick
Paragon Corporation wrote:
Yes, query the geography_columns view (type column) for the said schema,
table, column. You can also take a look and see how the view is built.
It is built against the postgresql catalog tables so will always reflect the
data type of the geogra
Yes, query the geography_columns view (type column) for the said schema,
table, column. You can also take a look and see how the view is built.
It is built against the postgresql catalog tables so will always reflect the
data type of the geography column.
Leo
http://www.postgis.us
-O
Hi,
I am trying to find a way to retrieve the geography type of a Postgis
column in Perl.
Using these statements:
my $datatype = $sth->{'TYPE'}->[$i];
my @type_info = $dbh->type_info([$datatype]);
my $dtype_name = $type_info[0]->{'TYPE_NAME'};
The content of $dtype_name is 'unknown' which is
If you want to go the tiling route and want to try that: Create a layer of
tiles (boxes) at the size you want. Then run the following query:
CREATE TABLE
tiled_geo_units as
SELECT
ST_Intersection(a.geometry, b.geometry) AS geometry,
On 03/03/2011 04:00 PM, pcr...@pcreso.com wrote:
It sounds like you are wanting to tile your polygons. Not really ideal, as each
polygon is rendered via tiles, so you need to render them without borders to
hide the tiles, then often plot the border as well, which still has all the
vertices. Lo
Hi Peter,
It sounds like you are wanting to tile your polygons. Not really ideal, as each
polygon is rendered via tiles, so you need to render them without borders to
hide the tiles, then often plot the border as well, which still has all the
vertices. Lots more work.
You might look at simpl
Take a look at ST_Simplify
http://postgis.refractions.net/docs/ST_Simplify.html
Or ST_SimplifyPreserveTopology if you want to preserve boundaries:
http://postgis.refractions.net/docs/ST_SimplifyPreserveTopology.html
-Mike
On 4 March 2011 09:44, Peter N. Schweitzer wrote:
>
> At http://tin.er.us
At http://tin.er.usgs.gov/geology/state/ and pages below it, I provide
geologic map units for US states in KML for use within Google Earth.
These are stored in PostgreSQL (9.0.2) with PostGIS (1.5.2). My problem
is that many of the larger geologic units are represented as polygons that
have a lar
Andreas,
How much memory do you have on your 64-bit desktop? I wonder if it would
have made a difference using 32-bit python.
I think the way 64-bit works, its actually worse if you don't have as much
memory because the address space of each is larger. Then again I might not
know what I am talk
Well its a new function in the upcoming PostGIS 2.0, but sadly doesn't exist
in prior versions of PostGIS.
http://www.postgis.org/documentation/manual-svn/ST_FlipCoordinates.html
If you don't have issues with running a not yet released version of PostGIS,
then you can use it.
Hope that helps,
Hi,
Qua, 2011-03-02 às 21:55 -0800, Nick raj escreveu:
> Hi,
> I am writing some spatio-temporal function in postgis.
> Like, ST_Enters( obj_geom, boundary_geom, time t1,time t2)
> i.e. Does vehicle enters in ABC area between time t1 to t2?
>
> For example, select ST_Enters ( obj_geom, (select bo
Very strange. The out of memory error i posted in my last post i got on my
64 bit desktop. I tried the excact same thing on my 32 bit laptop, and there
i did not get a out of memory when importing to the postgis1.5 database.
Andreas
2011/3/3 Andreas Forø Tollefsen
> It seems I had some problems
Hello folks!
We, and by "we" I mean the developer team that I currently work in, are
lookning for a PostGIS-function that can change the order of the coordinates in
a WKT-string (lat/lon) to the "correct" way (lon/lat).
1. Is there such a function already in place? I can't find any..
2. If not,
It seems I had some problems with my gdal python bindings. I downloaded the
64 bit Python 2.6 GDAL 1.7 bindings from here
http://www.lfd.uci.edu/~gohlke/pythonlibs/.
Now i can create the sql file. However. I have some new problems when
importing.
It works when i try to write the sql file to my Post
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