Version 2.0 of PostGIS brought a heavy set of new extensions for the PostgreSQL object-relational database, adding greater support for spatial objects.

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PostGIS data visualization

I have dump my data in PostGIS from shapefile successfully. I made a postgres connection through PHP and that also returning the data of other field. But the main problem is GEOM field visualization. ...
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749 views

How to snap line string start & end vertex to the nearest point?

I have a point layer and a line layer. The points are road junctions, collected using DGPS, while the lines are the connecting roads, collected through Handheld GPS in tracking mode. As a result, the ...
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How to get distance between one point and all other points in a table?

I have a table in Postgres with lat and long columns. Can I use the ST_Distance_Sphere or ST_Distance_Spheroid methods to get the distance between one point and all other points in the table? Do I ...
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496 views

How to clip from a point layer using postgis?

I've loaded a LIDAR xyz file into a PostGIS2.0 database and created a 3D point geometry column ("tblCLOUD") from the data. I've also loaded into the database a shapefile that contains six ...
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361 views

How to filter or query data in GRASS?

I have a PostGIS dataset with just over 2 million rows. Each row has a PostGIS geometry point value and several attributes. I'd like to do some analysis on certain subsets of the data, but I can't ...
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154 views

Can't drop table with geography column

I imported shp to postgis 2.0.1 with shp2pgsql and chose to use geography instead of geometry. However, now when I try to drop the table, the pgadmin/sql console/phpPgAdmin freezes. I can't neither ...
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671 views

How to set up GeoDjango with PostGIS 2.0?

I would like to run GeoDjango (Django 1.4) with Postgis 2.0. Whenever I try to run syncdb I get the following error for geographic fields: Failed to install index for stores.Store model: operator ...
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99 views

blank preview image for ImageMosaicJDBC (postgis raster) layer [duplicate]

In geoserver, while publishing ImageMosaicJDBC layer seems no problem, the preview of this layer does not give me an meaningful overview image, only a blank image with the correct lat lon extend. Also ...
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283 views

Is the PostGIS documentation correct for ST_Project?

In example of the page ST_Project the select is SELECT ST_AsText(ST_Project('POINT(0 0)'::geography, 100000, 45)); st_astext ------------------------------------------ ...
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How to find nearest line from point using PostGIS?

I have a table of Roads in PostGIS which geometry is "geometry(MultiLineString,4326)". Its attribute are gid osm_id name ref type oneway bridge maxspeed geom Now i want to know ...
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160 views

Open Source GIS Problem [closed]

I am new at open source GIS platform. I am using Ubuntu 12.10. I have tried to install the followings but without 2-3 tools I could not install anyone. Can any body help me how can I install the ...
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1k views

Postgres/Postgis doesn't work after update

I work on OpenSUSE 12.1 and after today's upgrade (2012 NOV 14) Postgres and Postgis doesn't work. If I login to Postgres server by PgAdmin, get the message: translated from polish "ERROR: can't acces ...
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2k views

How to fix 'GEOSDifference: TopologyException'?

Why does Postgis throws an error in this SQL? Error: ERROR: GEOSDifference: TopologyException: found non-noded intersection between LINESTRING (-5.67027 43.5374, -5.67085 43.5376) and LINESTRING ...
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1answer
203 views

Problems with QGIS (v 1.8.0) layer labels [closed]

I have a PostGIS (v 2.0) layer representing lakes. The attributes "chinchar" and "chintrans" contain Chinese characters and Pinyin (Roman) characters in UTF8 format. When I use Layer -> Labeling in ...
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1answer
588 views

Querying PostGIS Raster with MultiPoint

For one of my projects using PostGIS 2 I have a table with GPS tracks (igc_files). It holds records including a MULTIPOINT() column that has about 1,000 points for each record and a column that has an ...
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641 views

nearest neighbor within table using PostGIS

using PostGIS 2.0 and PostgreSQL 9.1 I have a table of photographic observations, sco_photos. The location column contains a PostGIS geometry point specifying where the observation was made. The table ...
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2answers
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What's the fastest way to search for polygons that intersect with others?

I'm querying the database for searching polygons that intersect with others, but is very slow research, wanted to increase the speed. I thought of using sphinx, solr, elastic search googled but did ...
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How to publish PostGIS Rasters in Geoserver?

What is the best solution to publish postgis rasters using Geoserver? I have spent a lot of time trying to create a Raster datasource using Image Mosaic JDBC but with no luck. Steps performed: 1. ...
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198 views

Can we create views over a raster table in Postgis2.0?

Is it possible to create PostgreSQL views over a table that contains raster data? I have succeeded in creating the view but the entry in raster_columns is not correct (all the raster info is ...
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1answer
53 views

How do I append PostGIS commands to the system path?

I'd like to be able to call psql instead of having to put in the full path everytime. I went into Environment Variables through My Computer and added the path to the semi-colon separated list, but ...
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1answer
348 views

What is the fastest way to identify the two nearest linestrings using PostGIS?

I want to be able to identify the closest roads to two points that are generated through geocoding (a start and end address). The points will likely be near a linestring. Two approaches that I have ...
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Postgis 2.0 - public.geometry_columns view does not contain correct info for views

We have recently updated our database to Postgis 2.0. In our system we used to create views for tables containing a geometry column. After creating the view we also manually updated the ...
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2k views

How to find polygons inside polygon with PostGIS 2.0

I have a relation representing all the counties in my country and the other one containing all the districts - e. g. each and every county is composed of several districts. How do I select them with ...
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269 views

Update PostGIS after updating GDAL?

I am using PostGIS 2.0 and I want to use the raster functionality through mapserver. It seems as if the latest official GDAL release 1.9.1 has an unstable PostGIS raster driver, as pointed out in a ...
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242 views

PostGIS raster support

I have the following requirements to manage raster data 1) Convert raster-maps from BSB format to PNG or GeoTIFF 2) Cut the borders of the map 3) Merge individual maps to form a contiguous coverage ...
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1answer
1k views

Access PostGIS Raster layer through mapserver

I am trying to use a cgi script calling mapserver to display a raster layer that is stored in a PostGIS database. However, only a blank white image is returned and I don't know where the problem is. ...
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How to split OSM roads into individual segments at intersections?

I want to create a road-network for use with pgRouting using OpenStreetMap data. I loaded a shapefile from GeoFabrik into a Postgres table (with PostGIS enabled). However, one problem I had was that ...
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853 views

Are Zonal Statistics possible in PostGIS2?

Now with postgis2 which supports rasters by default is it possible to do a zonal statistics analysis? I've google it but I haven't found anything solid? Is there a tutorial outthere to get me ...
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How to import data with SRID 4269 to GEOGRAPHY type?

In PostGIS, we are importing various US census bureau shapefiles (with SRID = 4269) using shp2pgsql loader. I have medium-sized database with several tables containing fields of type geography ...
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3answers
4k views

Loading geotiffs into PostGIS using raster2pgsql

I have an issue with loading some Ordnance Survey raster data into PostGIS. I have been using the following raster2pgsql command to load a tif that I have placed in my C:\Program ...
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2answers
208 views

st_intersection; What Im doing wrong?

Im trying to run this query : create TABLE data.agri_grc as select id, code_00, ST_Intersection(data.agri.geom,data.grc_bor.geom) as geom from data.agri; But im getting this error: ERROR: missing ...
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How to export data from QGIS to display in Google Maps?

I'm exporting layers of a project for a quantum gis postgis table and visualizing the data in gmaps, but the coordinates are very wrong. is there any special way to export the quantum gis? postgres ...
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Create a stacked bar chart with matplotlib [closed]

I'm trying to create a stacked bar chart in python with matplotlib and I can draw my bar one up the other # -*- coding: utf-8 -*- import psycopg2 import matplotlib.pyplot as plt import numpy as np # ...
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Postgis error on select all intersetcs of a polygon [closed]

i can get all polygon on intersects this:-7.9245860488441 -37.122384500713,-7.9245860488441 -37.11904223938,-7.9233955716106 -37.1187601948 SELECT * FROM propriedades WHERE ST_Intersects( ...
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1answer
414 views

How can I find the nearest points (plural) on a line segment using PostGIS

I'm locating the nearest point on a line segment with PostGIS and ST_ClosestPoint, I can select the point on each of these line segments which is closest to the starting point. Which looks something ...
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2k views

How to render PostGIS raster with Mapnik XML?

I'm trying to manage raster files from PostGIS, which to be rendered using Mapnik. I used raster2pgsql to load those GeoTIFF images to PostGIS, and I think the loading process turned out OK. The ...
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2answers
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Importing planet files into Nominatim

After a gruesome night installing PostgreSQL 9.1, PostGIS 2 and Nominatim 2 on CentOS 6.3 using the instructions here, I am finally at the stage of importing a US planet file. Problem: In ...
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Force SRID in views in Postgis 2.0

I have a very tricky problem: I have a Postgis 2.0 database, used as datastore for Geoserver 2.1.3 I have a table with a geometry column (named shape), with SRID 4326 I have created a view like ...
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PostGIS and geometry column

I have a csv table. Each record includes a start node (lat1,lon1) and an end node (lat2,lon2). I have already imported the .csv into Postgresql 8.4. Now I would like set the geometry column. I tried ...
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214 views

How could I make this PostGIS query run faster?

SELECT st_band(rast, 1), st_width(rast), st_height(rast), st_bandpixeltype(rast, 1), st_bandnodatavalue(rast, 1), st_scalex(rast), st_scaley(rast), st_upperleftx(rast), st_upperlefty(rast) FROM ...
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1answer
156 views

Join Zip Codes Table to Nearest City from Second Table

I have two tables, siteareas and ziplookup. The former contains large cities in the US; the latter all US zips with lat/lngs. I have a foreign key into the former table in the latter: sitearea_id. I ...
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106 views

Are geotiffs with the embedded georeferencing information supported?

I am able to load raster data into my postrgreSQL data base however when I display in Quantum GIS the pixel height and width of the image is being translated into real world lat/lon coordinates, as a ...
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1answer
549 views

error performing wfs-t insert in postgres 9.1.4

I am getting error performing insert exception while performing wfs-t insert operation when i use postgres 9.1.4 and postgis 2.0. but i get successful insert when using postgres 9.0.1 and postgis ...
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Are there limitations using a PostGIS out-db raster?

I have been trying to import a large raster into a PostGIS 2.0 database and hit a few stumbling blocks. Initially when I tried to import the raster using raster2pgsql, I would receive the following ...
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101 views

How to convert FROM Navit to PostGis or SHP?

I have a Navit BIN file which I want to use in PostGis or QGis, so I need to import it to PostGis or convert it to a shapefile. I have found a lot of information on how to convert data TO the Navit ...
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441 views

How to create,store and retrieve the spatial data in postgresql [closed]

i am new to postgresql/postgis can anyone explain in steps about how to store the spatial data and retrieve the spatial data and visualise in map in a proper steps.. pls . its very urgent..
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1answer
2k views

Error creating a spatial database. ERROR : could not load library “/usr/pgsql-9.1/lib/rtpostgis-2.0.so”

I am running PostgreSQL 9.1 with Postgis 2.0 on Fedora 15. When trying to install the raster support, psql -d mydb -f rtpostgis.sql -v ON_ERROR_STOP=1 I get the following error ...
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1answer
3k views

How to find the nearest point by using PostGIS function?

table A: lat | long | the_geom | code | sign 13.8433095 | 100.6360357 | 0101000020E61.... | ABC | start_point 13.7544738 | 100.5459646 | 0101000020E6..... | ABC | end_point 13.4124215 | 100.6232332 ...
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64 views

Can I use in a postgis db within the same table a combination of CRS?

I'm experimenting around with my postgis2.0 database. I want to create a basic table to store all my point data and in the process,I realized that the coordinates are in different CRSs. So naturally ...
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449 views

PostGis, export Svg in pixels

I'm new to GIS. It is very intersting. I have installed Postgis, insert shapefile, get data in SVG without problem (ST_AsSVG). Now, I'd like to export the same svg but in pixel to add it on top of ...