[postgis-users] Tools to change the encoding of the SHP/DBF files (from Latin1 to UTF-8)
Hi. Using PostGIS 1.5 on Windows, I get this error message when trying to import a SHP: Unable to convert data value to UTF-8 (iconv reports Invalid argument). Current encoding is UTF-8. Try LATIN1 (Western European), or one of the values described at http://www.postgresql.org/docs/current/static/multibyte.html. Really my data are in Latin1 encoding, but I don't want to change the encoding of the DataBase into Latin1, but change the encoding of the SHP (in fact, of the DBF) into UTF-8. Which tool could I use to do this? Thank you very much. ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
Re: [postgis-users] Tools to change the encoding of the SHP/DBF files (from Latin1 to UTF-8)
On Tue, May 08, 2012 at 02:56:28PM +0200, Mac Wind wrote: Hi. Using PostGIS 1.5 on Windows, I get this error message when trying to import a SHP: Unable to convert data value to UTF-8 (iconv reports Invalid argument). Current encoding is UTF-8. Try LATIN1 (Western European), or one of the values described at http://www.postgresql.org/docs/current/static/multibyte.html. Really my data are in Latin1 encoding, but I don't want to change the encoding of the DataBase into Latin1, but change the encoding of the SHP (in fact, of the DBF) into UTF-8. Which tool could I use to do this? Thank you very much. You don't have to change DB encoding, just tell the loader that your data is in Latin1: $ shp2pgsql -W Latin1 ... --strk; ,--o-. | __/ |Delivering high quality PostGIS 2.0 ! | / 2.0 |http://strk.keybit.net - http://vizzuality.com `-o--' ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
Re: [postgis-users] Very large WHERE clause?
I have no joins. It is all in one large table with 20M records (and one field is a geometry bounding box). What I am considering now is not doing the Type=JPEG ... etc filter in the stored procedure, but only the ST_INTERSECTS there. The result should be about 3K-5k records, which then I can do the additional set filtering (the rest of the WHERE clause) in LINQ or PLINQ. Does this make sense? Does the DB have better architecture and performance for doing set membership (IN test over 4 attributes) than does the C# LINQ? I could also do what the other person suggested here, which is create a bitmask (40 bits) and then do a AND test against it for membership in the set. But I am not clear in LINQ, .NET does this already, and I am wasting my time. -- View this message in context: http://postgis.17.n6.nabble.com/Very-large-WHERE-clause-tp4952906p4960408.html Sent from the PostGIS - User mailing list archive at Nabble.com. ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
Re: [postgis-users] building a polygon with variables
On 5/8/2012 10:26 AM, Gold, Jack L (US SSA) wrote:
I’m not even sure how to express this properly, but I’ll try. I’m trying
to build a query which will select positions within a specified polygon.
I have the query:
SELECT * FROM positions WHERE ST_Within(geometry(positions.location),
ST_GeomFromText(‘POLYGON((l b, r b, r t, l t, l b))’::text, 4326));
I want to be able to replace l, b, r, and t with variable values in a
plpgsql function like so:
$BODY$
DECLARE
l integer;
r integer;
b integer;
t integer;
BEGIN
SELECT pli_config.filter_left_longitude INTO l FROM pli_config;
SELECT pli_config.filter_right_longitude INTO r FROM pli_config;
SELECT pli_config.filter_bottom_latitude INTO b FROM pli_config;
SELECT pli_config.filter_top_latitude INTO t FROM pli_config;
SELECT * FROM positions
WHERE st_within(geometry(positions.location),
st_geomfromtext('POLYGON((l b,r b,r t,l t,l b))'::text, 4326));
'POLYGON(('||l||' '||b||','||r||' '||b||','
END;
$BODY$
The problem I have is I don’t know the proper syntax to replace the
variables in the single-quoted statement or even if it is possible. Any
ideas?
--Jack Gold
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[postgis-users] DE-9IM question
Does anyone know of an exhaustive reference of DE-9IM matrices, with pictures? Context: I just finished classifying a bunch of polygons based on their relationship to enveloping poly's in another layer (census blocks and census city boundaries, respectively). The regular old st_within() and friends weren't enough, so I calculated all the DE-9IM's, counted them (yay for GROUP BY and real databases!), and made sure I knew what was going on for each of the matrices returned (7 total). Then I classified my block polys based on the strings. I found it CRAZY how many different types of DE-9IM's could be returned, even with just polygons and very well aligned boundaries (credit to the US Census Bureau's geography division). Only a few of the matrices in my data were actually described in the few docs I could find. Besides the seven in my data, there are at least four more that can be generated by various combinations of overlapping polygons. It would have been much easier to do this project if I had been able to reference a list of possibilities along with pictures. It would be even better if I could be confident that such a list was exhaustive. Does anyone have a reference? If not, I could continue to work on an atlas of DE-9IM matrices, at least for polygons, and submit it somewhere if it were helpful. Any ideas for where that might go? (I don't have a blog and don't want to start one). Maybe just the wikipedia entry? For those who don't know, a DE-9IM matrix is the output of st_relate(geo1, geo2), and there is an excellent intro in the docs. Fascinating stuff really. Tx ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
Re: [postgis-users] DE-9IM question
On Tue, May 08, 2012 at 03:46:36PM +, fork wrote: Does anyone know of an exhaustive reference of DE-9IM matrices, with pictures? http://en.wikipedia.org/wiki/DE-9IM http://postgis.org/documentation/manual-svn/using_postgis_dbmanagement.html#DE-9IM --strk; ,--o-. | __/ |Delivering high quality PostGIS 2.0 ! | / 2.0 |http://strk.keybit.net - http://vizzuality.com `-o--' ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
Re: [postgis-users] DE-9IM question
Sandro Santilli strk at keybit.net writes: http://en.wikipedia.org/wiki/DE-9IM http://postgis.org/documentation/manual-svn/using_postgis_dbmanagement.html#DE-9IM Those either aren't exhaustive (postgis) or don't have pictures (wiki). I would like to be able to look up FF2F1F212 and see a picture of it. I think a difference is that I am not interested in using a matrix to implement a function like st_within(), but rather I am querying a database looking for relationships and how to deal with them. In my case, also, the query will never return a string with wildcards in it, because it will give me the exact relationship. (Maybe the above links are exhaustive if you count wildcards, though...) Sorry -- I tried to make clear that I had already read the docs that are easily available. Thanks for the explicit links though. ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
[postgis-users] POSTGIS Security
I've been told that POSTGIS has a new security package. Someone said it was called POSTGIS ES? Can anyone point me to the information on line or send me documentation. Valerie Reinert MITRE Corporation vrein...@mitre.org ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
Re: [postgis-users] POSTGIS Security
Hello, I don't think there is something called POSTGIS ES but a new version of PostGIS 1.5.x serie was released e.g http://postgis.refractions.net/pipermail/postgis-users/2012-May/033992.html I think it's what you're expecting. Regards ThomasG ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
Re: [postgis-users] PostGIS 1.5.4 Released
I'm trying to install and upgrade a database with the new 1.5.4 version ad I'm getting an error. I did the ./configure; make; sudo make install which all went well psql -U postgres -h localhost testdb testdb=# select * from postgis_full_version(); postgis_full_version - POSTGIS=1.5.4 GEOS=3.2.0-CAPI-1.6.0 PROJ=Rel. 4.6.1, 21 August 2008 LIBXML=2.6.32 USE_STATS (procs from 1.5 r7360 need upgrade) (1 row) testdb=# set search_path to public, pg_catalog; SET testdb=# \i postgis_upgrade_15_minor.sql BEGIN CREATE FUNCTION postgis_major_version_check -- Scripts versions checked for upgrade: ok (1 row) DROP FUNCTION CREATE FUNCTION CREATE FUNCTION ... CREATE FUNCTION psql:postgis_upgrade_15_minor.sql:220: NOTICE: type box3d_extent is not yet defined DETAIL: Creating a shell type definition. CREATE FUNCTION psql:postgis_upgrade_15_minor.sql:224: NOTICE: argument type box3d_extent is only a shell CREATE FUNCTION psql:postgis_upgrade_15_minor.sql:228: NOTICE: argument type box3d_extent is only a shell CREATE FUNCTION psql:postgis_upgrade_15_minor.sql:232: NOTICE: argument type box3d_extent is only a shell CREATE FUNCTION psql:postgis_upgrade_15_minor.sql:236: NOTICE: argument type box3d_extent is only a shell CREATE FUNCTION CREATE FUNCTION CREATE FUNCTION CREATE FUNCTION ... CREATE FUNCTION CREATE FUNCTION CREATE FUNCTION psql:postgis_upgrade_15_minor.sql:1263: NOTICE: argument type box3d_extent is only a shell psql:postgis_upgrade_15_minor.sql:1263: NOTICE: return type box3d_extent is only a shell CREATE FUNCTION psql:postgis_upgrade_15_minor.sql:1267: NOTICE: argument type box3d_extent is only a shell psql:postgis_upgrade_15_minor.sql:1267: NOTICE: return type box3d_extent is only a shell CREATE FUNCTION psql:postgis_upgrade_15_minor.sql:1268: NOTICE: aggregate extent(geometry) does not exist, skipping DROP AGGREGATE psql:postgis_upgrade_15_minor.sql:1273: ERROR: type box3d_extent is only a shell psql:postgis_upgrade_15_minor.sql:1274: ERROR: current transaction is aborted, commands ignored until end of transaction block psql:postgis_upgrade_15_minor.sql:1279: ERROR: current transaction is aborted, commands ignored until end of transaction block psql:postgis_upgrade_15_minor.sql:1283: ERROR: current transaction is aborted, commands ignored until end of transaction block psql:postgis_upgrade_15_minor.sql:1287: ERROR: current transaction is aborted, commands ignored until end of transaction block psql:postgis_upgrade_15_minor.sql:1288: ERROR: current transaction is aborted, commands ignored until end of transaction block psql:postgis_upgrade_15_minor.sql:1293: ERROR: current transaction is aborted, commands ignored until end of transaction block psql:postgis_upgrade_15_minor.sql:1294: ERROR: current transaction is aborted, commands ignored until end of transaction block psql:postgis_upgrade_15_minor.sql:1299: ERROR: current transaction is aborted, commands ignored until end of transaction block psql:postgis_upgrade_15_minor.sql:1302: ERROR: current transaction is aborted, commands ignored until end of transaction block psql:postgis_upgrade_15_minor.sql:1305: ERROR: current transaction is aborted, commands ignored until end of transaction block ... psql:postgis_upgrade_15_minor.sql:5161: ERROR: current transaction is aborted, commands ignored until end of transaction block ROLLBACK testdb=# select postgis_full_version(); postgis_full_version - POSTGIS=1.3.3 GEOS=3.2.0-CAPI-1.6.0 PROJ=Rel. 4.6.1, 21 August 2008 USE_STATS (1 row) Is the upgrade script broken? How can I fix this? Thanks, -Steve On 5/6/2012 6:41 AM, Paul Ramsey wrote: Download from: http://postgis.org/download/postgis-1.5.4.tar.gz The news: This is a bug fix release, addressing issues that have been filed since the 1.5.3 release. - Bug Fixes - #547, ST_Contains memory problems (Sandro Santilli) - #621, Problem finding intersections with geography (Paul Ramsey) - #627, PostGIS/PostgreSQL process die on invalid geometry (Paul Ramsey) - #810, Increase accuracy of area calculation (Paul Ramsey) - #852, improve spatial predicates robustness (Sandro Santilli, Nicklas Avén) - #877, ST_Estimated_Extent returns NULL on empty tables (Sandro Santilli) - #1028, ST_AsSVG kills whole postgres server when fails (Paul Ramsey) - #1056, Fix boxes of arcs and circle stroking code (Paul Ramsey) - #1135, improve testsuite predictability (Andreas 'ads' Scherbaum) - #1146, images generator crashes (bronaugh) - #1170, North Pole intersection fails (Paul Ramsey) - #1179, ST_AsText crash with bad value (kjurka) - #1184, honour DESTDIR in
Re: [postgis-users] DE-9IM question
fork forkandwait at gmail.com writes: I found it CRAZY how many different types of DE-9IM's could be returned, even with just polygons and very well aligned boundaries (credit to the US Census Bureau's geography division). Only a few of the matrices in my data were actually described in the few docs I could find. For a flavor, look at Table 3 here: http://www.cise.ufl.edu/~mschneid/Research/papers/BS01ER.pdf Note that these matrices are boolean for the intersection, and there are 32 of them. One can tweak them so that the max dimension on the boundaries is either 0 (a point) or 1 (a line) and create more matrices using the full definition of DE-91M; see #33. I am mostly just entertaining myself with mathematical patterns, but I think the topological matrices might be useful in trying to figure out how to simplify slivers and weird things. I also think one's intuition about within might not stand up to closer scrutiny via mathematical formalisms like this. The only way I could figure out my blocks-in-cities problem was to abandon st_within() etc and go for a list of specific DE-9IM's based on the data. If I feel bored/ ambitious I will try to create a useful atlas. I don't think one exists... ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
Re: [postgis-users] PostGIS 1.5.4 Released
Never mind! the problem is because the upgrade scripts are not schema aware. I keep all my data in the data schema and have the database search_path set to data, public and when I last upgraded from 1.3.3 to 1.5.3 it dumped all the functions into the data schema creating a mess. So now I probably just need to dump tables for about 50 databases and rebuild the databases from the dumps. sigh I think this probably need to be put off until I can upgrade to 9.x and 2.0 on a new server. -Steve On 5/8/2012 4:00 PM, Stephen Woodbridge wrote: I'm trying to install and upgrade a database with the new 1.5.4 version ad I'm getting an error. I did the ./configure; make; sudo make install which all went well psql -U postgres -h localhost testdb testdb=# select * from postgis_full_version(); postgis_full_version - POSTGIS=1.5.4 GEOS=3.2.0-CAPI-1.6.0 PROJ=Rel. 4.6.1, 21 August 2008 LIBXML=2.6.32 USE_STATS (procs from 1.5 r7360 need upgrade) (1 row) testdb=# set search_path to public, pg_catalog; SET testdb=# \i postgis_upgrade_15_minor.sql BEGIN CREATE FUNCTION postgis_major_version_check -- Scripts versions checked for upgrade: ok (1 row) DROP FUNCTION CREATE FUNCTION CREATE FUNCTION ... CREATE FUNCTION psql:postgis_upgrade_15_minor.sql:220: NOTICE: type box3d_extent is not yet defined DETAIL: Creating a shell type definition. CREATE FUNCTION psql:postgis_upgrade_15_minor.sql:224: NOTICE: argument type box3d_extent is only a shell CREATE FUNCTION psql:postgis_upgrade_15_minor.sql:228: NOTICE: argument type box3d_extent is only a shell CREATE FUNCTION psql:postgis_upgrade_15_minor.sql:232: NOTICE: argument type box3d_extent is only a shell CREATE FUNCTION psql:postgis_upgrade_15_minor.sql:236: NOTICE: argument type box3d_extent is only a shell CREATE FUNCTION CREATE FUNCTION CREATE FUNCTION CREATE FUNCTION ... CREATE FUNCTION CREATE FUNCTION CREATE FUNCTION psql:postgis_upgrade_15_minor.sql:1263: NOTICE: argument type box3d_extent is only a shell psql:postgis_upgrade_15_minor.sql:1263: NOTICE: return type box3d_extent is only a shell CREATE FUNCTION psql:postgis_upgrade_15_minor.sql:1267: NOTICE: argument type box3d_extent is only a shell psql:postgis_upgrade_15_minor.sql:1267: NOTICE: return type box3d_extent is only a shell CREATE FUNCTION psql:postgis_upgrade_15_minor.sql:1268: NOTICE: aggregate extent(geometry) does not exist, skipping DROP AGGREGATE psql:postgis_upgrade_15_minor.sql:1273: ERROR: type box3d_extent is only a shell psql:postgis_upgrade_15_minor.sql:1274: ERROR: current transaction is aborted, commands ignored until end of transaction block psql:postgis_upgrade_15_minor.sql:1279: ERROR: current transaction is aborted, commands ignored until end of transaction block psql:postgis_upgrade_15_minor.sql:1283: ERROR: current transaction is aborted, commands ignored until end of transaction block psql:postgis_upgrade_15_minor.sql:1287: ERROR: current transaction is aborted, commands ignored until end of transaction block psql:postgis_upgrade_15_minor.sql:1288: ERROR: current transaction is aborted, commands ignored until end of transaction block psql:postgis_upgrade_15_minor.sql:1293: ERROR: current transaction is aborted, commands ignored until end of transaction block psql:postgis_upgrade_15_minor.sql:1294: ERROR: current transaction is aborted, commands ignored until end of transaction block psql:postgis_upgrade_15_minor.sql:1299: ERROR: current transaction is aborted, commands ignored until end of transaction block psql:postgis_upgrade_15_minor.sql:1302: ERROR: current transaction is aborted, commands ignored until end of transaction block psql:postgis_upgrade_15_minor.sql:1305: ERROR: current transaction is aborted, commands ignored until end of transaction block ... psql:postgis_upgrade_15_minor.sql:5161: ERROR: current transaction is aborted, commands ignored until end of transaction block ROLLBACK testdb=# select postgis_full_version(); postgis_full_version - POSTGIS=1.3.3 GEOS=3.2.0-CAPI-1.6.0 PROJ=Rel. 4.6.1, 21 August 2008 USE_STATS (1 row) Is the upgrade script broken? How can I fix this? Thanks, -Steve On 5/6/2012 6:41 AM, Paul Ramsey wrote: Download from: http://postgis.org/download/postgis-1.5.4.tar.gz The news: This is a bug fix release, addressing issues that have been filed since the 1.5.3 release. - Bug Fixes - #547, ST_Contains memory problems (Sandro Santilli) - #621, Problem finding intersections with geography (Paul Ramsey) - #627, PostGIS/PostgreSQL process die on invalid geometry (Paul Ramsey) - #810, Increase accuracy of area calculation (Paul Ramsey) - #852, improve spatial predicates robustness (Sandro Santilli, Nicklas Avén) - #877, ST_Estimated_Extent returns NULL on empty tables (Sandro Santilli) -
Re: [postgis-users] building a polygon with variables
On 9 May 2012 02:26, Gold, Jack L (US SSA) jack.g...@baesystems.com wrote: I want to be able to replace l, b, r, and t with variable values in a plpgsql function like so: It looks like you want to make a polygon from 'left', 'bottom', 'right' and 'top'. Rather than formatting WKT, you could use a geometry constructor function: SELECT ST_MakeEnvelope(l, b, r, t, 4326); http://postgis.refractions.net/docs/ST_MakeEnvelope.html -Mike ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
Re: [postgis-users] POSTGIS Security
On 9 May 2012 04:45, Valerie Reinert vcrein...@gmail.com wrote: I've been told that POSTGIS has a new security package. Someone said it was called POSTGIS ES? Can anyone point me to the information on line or send me documentation. I think you heard about SE-PostgreSQL or Security-Enhanced PostgreSQL, which uses Security-Enhanced Linux, originally developed by the US NSA. Although I've never used it, I would think PostGIS would be compatible with the framework. Here is a good introduction to SE-PostgreSQL: http://wiki.postgresql.org/wiki/SEPostgreSQL_Introduction And and to SE-Linux: http://www.nsa.gov/research/selinux/ -Mike ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
Re: [postgis-users] DE-9IM question
On 9 May 2012 03:46, fork forkandw...@gmail.com wrote: Does anyone know of an exhaustive reference of DE-9IM matrices, with pictures? A really handy visual tool to work with DE-9IM is JTS TestBuilder. You can interact with the geometries and the results, which makes it a pretty good educational tool. You can copy/paste WKB directly into the geometry inputs, which makes it work nice with PostGIS. Take a look at http://gis.stackexchange.com/a/12119/1872 -Mike ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
Re: [postgis-users] DE-9IM question
Hi fork On 2012/5/8 fork forkandw...@gmail.com wrote: Does anyone know of an exhaustive reference of DE-9IM matrices, with pictures? I don't think I would call it a reference but take a look http://labs.geometa.info/postgisterminal/?xapi=node[tourism=zoo] : There is a menu item Relate exemplified (bool) which displays parameters as as list of pictures (disregarding of the current query). Choose the two geometry types and the DE-9IM pattern, then click on [+] and look at the prerendered pictures. Pls. give feedback if you have any suggestions. -S. Context: I just finished classifying a bunch of polygons based on their relationship to enveloping poly's in another layer (census blocks and census city boundaries, respectively). The regular old st_within() and friends weren't enough, so I calculated all the DE-9IM's, counted them (yay for GROUP BY and real databases!), and made sure I knew what was going on for each of the matrices returned (7 total). Then I classified my block polys based on the strings. I found it CRAZY how many different types of DE-9IM's could be returned, even with just polygons and very well aligned boundaries (credit to the US Census Bureau's geography division). Only a few of the matrices in my data were actually described in the few docs I could find. Besides the seven in my data, there are at least four more that can be generated by various combinations of overlapping polygons. It would have been much easier to do this project if I had been able to reference a list of possibilities along with pictures. It would be even better if I could be confident that such a list was exhaustive. Does anyone have a reference? If not, I could continue to work on an atlas of DE-9IM matrices, at least for polygons, and submit it somewhere if it were helpful. Any ideas for where that might go? (I don't have a blog and don't want to start one). Maybe just the wikipedia entry? For those who don't know, a DE-9IM matrix is the output of st_relate(geo1, geo2), and there is an excellent intro in the docs. Fascinating stuff really. Tx ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
Re: [postgis-users] topology performance improvement purpose
Do you need to even change the search_path - surely you could have a function version with the 'topology' schema hard-coded for the performance improvement. Obviously that won't work if you have a different schema name, but if the performance enhancement is worth it, grepping out topology to whatever you need will also be worth the effort. cheers Ben On 03/05/2012, at 5:58 AM, Jose Carlos Martinez Llario wrote: Hi, wanted to share a though about improving the topology performance in postgis. Many of the functions are using EXECUTE instead of running directly select commands. In many cases this is need just because of the used of the schema name of the topology primitive tables. I found between 4 and 10 times improving performance some sentences. I guessing it could be even better. My question is if an approach like the following makes sense: 1.- With one command we can make the current topology schema the default schema in search path, 2.- then working with topology 3.- Change search_path again when finishing the spatial analysis. (the parameter of the topology name in the functions should be ignored or removed) I know it requires a lot of changes but currently the performance of the persistent topology is too slow. if one do that many functions can be run without EXECUTE. Spatial analysis between different topologies is not possible which fits the procedure. What do you think Sandro? Regards, Jose ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
Re: [postgis-users] Size of a multipolygon
Thanks Brent, Stephen, Clearly the answer was much to straightforward for me to find!! I blame a poorly constructed question. Thank you. On 02/05/2012, at 1:06 PM, pcr...@pcreso.com wrote: FYI, I was interested in this post, as a PL/R user it may interest you as well? http://www.spatialdbadvisor.com/postgis_tips_tricks/290/r-based-delaunay-triangulation-function-for-postgis-using-the-deldir-package Nice - I've used Regina's script before a couple of times, but I haven't had to worry about three dimensions. Once to define approximate postcode boundaries for Australia - it's possible to obtain a list of postcode points, but Australia Post specifically declines to produce a map showing which areas are covered by which postcodes (mainly because they are not simply distributed by distance - some people get their mail by plane once a week, a live over 1000km from 'their' post-office. But they are outliers from an epidemiological perspective. Also for mobile phone tower coverage - then truncating all the polygons at 35km from the centroid. We now use PL/R almost exclusively for data output (except for interactive maps) on web sites - including tables. cheers Ben Cheers, Brent --- On Wed, 5/2/12, Ben Madin li...@remoteinformation.com.au wrote: From: Ben Madin li...@remoteinformation.com.au Subject: [postgis-users] Size of a multipolygon To: PostGIS Users Discussion postgis-users@postgis.refractions.net Date: Wednesday, May 2, 2012, 3:26 PM Hello all, I'm sure the answer is simple, but I'm lost on what to search on - I need to quickly search through several thousand multi polygons for any which have more than one part making them up. What is the best way to do this…? (I've tried array_length(), but don't seem to be able to feed it the right part. I can't believe I can't find a function that does it… or am I looking at dumping the multi polygons into a new table and counting the number of lines for each one... cheers Ben ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
Re: [postgis-users] DE-9IM question
Have a look at: http://www.vividsolutions.com/jts/tests/index.html This is a visual interface to the JTS Test Suite, which has a very complete collection of DE-9IM cases. It is meant to be exhaustive - if you find something missing, send it in! It would be interesting to see the 7 situations that you found. The test suite is here: http://jts-topo-suite.svn.sourceforge.net/viewvc/jts-topo-suite/trunk/jts/testxml/ The validate directory contains the DE-9IM tests. As was mentioned, you can use the JTS TestBuilder to build and inspect test cases. You can drag-and-drop Test Suite XML files onto the TestBuilder, so it's easy to inspect the cases in the XML tests. I'm not sure if Wikipedia would appreciate being flooded with DE-9IM test cases - it doesn't seem like quite the right place for it. The Vivid site is a good reference as long as it stays up. On 5/8/2012 8:46 AM, fork wrote: Does anyone know of an exhaustive reference of DE-9IM matrices, with pictures? Context: I just finished classifying a bunch of polygons based on their relationship to enveloping poly's in another layer (census blocks and census city boundaries, respectively). The regular old st_within() and friends weren't enough, so I calculated all the DE-9IM's, counted them (yay for GROUP BY and real databases!), and made sure I knew what was going on for each of the matrices returned (7 total). Then I classified my block polys based on the strings. I found it CRAZY how many different types of DE-9IM's could be returned, even with just polygons and very well aligned boundaries (credit to the US Census Bureau's geography division). Only a few of the matrices in my data were actually described in the few docs I could find. Besides the seven in my data, there are at least four more that can be generated by various combinations of overlapping polygons. It would have been much easier to do this project if I had been able to reference a list of possibilities along with pictures. It would be even better if I could be confident that such a list was exhaustive. Does anyone have a reference? If not, I could continue to work on an atlas of DE-9IM matrices, at least for polygons, and submit it somewhere if it were helpful. Any ideas for where that might go? (I don't have a blog and don't want to start one). Maybe just the wikipedia entry? For those who don't know, a DE-9IM matrix is the output of st_relate(geo1, geo2), and there is an excellent intro in the docs. Fascinating stuff really. Tx ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users - No virus found in this message. Checked by AVG - www.avg.com Version: 2012.0.1913 / Virus Database: 2425/4985 - Release Date: 05/08/12 ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
