PostGIS is an extension for the PostgreSQL object-relational database that adds support for geographic objects.

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Styling river charts with TileMill - issue with filling a polygon made of disjoint line segments

I am trying to style inland river charts produced by the Army Corps of Engineers. I imported the vectors into Postgres, and I’m using TileMill to style the data. I am having trouble correctly filling ...
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50 views

Update PG table setting an area_id

I have a table with lots of points which I'd like to update and set a consecutive area_id to every point "group". I define a point "group" as points that are within a 500 meters radius. The raw table ...
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99 views

Geoserver Feature Versioning Support

I am creating a map feature editor that supports versioning & rollback using Geoserver as the WFS. From what I've read online, it seems Geoserver supports feature versioning. My question is how ...
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576 views

Migrating from PostGIS to Oracle Spatial

We are now using a solution based on PostGIS extension of Postgresql database for various spatial queries. But we are now thinking about data security. This is why we have a plan to migrate existing ...
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642 views

Smooth, not simplify, lines features in PostGIS

I'm trying to automatically generate paths to place labels on that follow the shape of rivers, 4wd tracks and other very windy lines. At first I thought the st_simplify() function was the answer, but ...
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102 views

Can't connect to WMS service? An Amazon-EC2 problem?

I'm running GeoServer 2.3.5 on a Windows instance in AWS for the first time. The data is on the server in PostGIS. The map layers have been published and I can see them locally without any problems. ...
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192 views

Spatial Precision for Editing in Multiple GIS Clients

I have something I'd like to discuss, I'll try to explain it first, why it's important, and I'll explain how ArcGIS handles the issue, which I think is a good way to handle it. Finally I'd like to ...
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165 views

Large buffers in PostGIS (5000 km radius)

I have a number of points stored as geographies in PostGIS (version 2.0.1), and I'd like to create rather large buffers around them (with a radius of 5000+ km). However, ST_Buffer doesn't handle this ...
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460 views

3D features (Polyline, Polygon) intersection library

For my research I am looking for a (python) library to get the intersection of some 3D features. The features can be Polygons or Polylines. Mostly I need to intersect a plane with my features and get ...
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253 views

get all the possible parameters of sql view

I have a Geoserver layer coming from a postGIS database. Among other attributes, I have one that is related to the date data we've collected, called departuretime. We use this attribute to display a ...
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129 views

Optimize ST_CoveredBy performance

I have a PostGIS 2.0.3 table with 113,862 records with multipolygons represented both as geometry and geography. There is a gist index on each of them. I'm running the following queries: SELECT *, ...
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732 views

Geoserver - empty native SRS field

I'm converting layers from shape files to postgis with the below command: shp2pgsql -s 22175 -c -W "latin1" path/file.dbf' table_name db_name | psql -d db_name Next, I add this layer to the ...
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143 views

Installing knn on PostgreSQL for windows

I am trying to install the extension KNN for clustering as an extension on my PostgreSQL database. I have downloaded the file http://www.pgxn.org/tag/analysis I found instructions on how to ...
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33 views

Spatial overlay data from many lines into a single line

Hello I have joined lines in my data set into longer lines (based on similar attributes) to reduce the number of rows in my data set. Now I want to take the information from the original smaller lines ...
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548 views

QGIS SPIT errors loading shapefile into PostGIS

With QGIS 1.8 on Windows 7, I just installed PostgreSQL / PostGIS and tried to load my first data into it, a shapefile using SPIT, but failed: ERROR: Geometry type (Polygon) does not match column ...
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178 views

Creating polygons for a choropleth map using PostGIS

I have a grid of points, each with a value to it as shown in the image below. The data was retrieved from PostGIS and rendered in Quantum GIS. The final result should be a polygons of a choropleth map ...
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2k views

PostGIS Better ST_Intersects Query

I am currently using the following queries to return all features that intersect a large and complex polygon. I initially tried to use a single ST_Intersect query but because the number of features it ...
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120 views

Storing features in PostGIS and then creating layers using queries

I have a whole set of line segments or tracks that represent real tracks or, in some case, boundaries between areas. These segments form a network of lines on the map. I have a number of GIS layers, ...
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176 views

How to Create database using OGC compliant geometries and Custom type Geometries?

I am interested in storing geometry attributes in a PostGis database, so that it would be OGC compliant, along with OGC compliant geometry types like point,line, linestring, etc. I also wanted to ...
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148 views

Table for feature layer in PostGIS database cannot be published and enabled on GeoServer

I have tried to publish a table for feature layer in a PostGIS database to GeoServer 2.2.5. The layer was added and published. However, the layer has got a yellow exclamation mark in the "Enabled?" ...
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35 views

Automatic insert of project name into database

For every layer I've a field in my postGIS database that should be filled with the name of the current project and today I do this manually. Is there a way to do this with the Commands that can be ...
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777 views

How to merge linestrings which are connected with each other?

I would like to join linestrings which are connected to each other. The preferred output is a longer linestring based on all joined single linestings! The table that holds my single linestrings is ...
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326 views

Different results given by PostGIS and MySQL?

I'm developing a spatial database of administrative areas. I started out with PostGIS, but as MySQL is being used in our other projects, I thought I would at least try to create a spatial-enabled ...
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143 views

GeoServer and PostGIS connection technology?

Does anybody know how GeoServer connects to PostGIS. Which technology is used? Is it JDBC?
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1k views

How to handle postgresql/postgis geometry type errors in a function?

I have created the following function in PL/SQL to make a polygon from a set of linestrings: CREATE OR REPLACE FUNCTION _myfunction( _fid integer, _rid integer ) RETURNS VOID AS $$ ...
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200 views

Projecting PostGIS in Openlayers

I have a layer(base layer) with MultiLineString Geometries and now I need to project the layers(overlays) in the base layer from PostGIS using OpenLayers. However, I got an idea how to project table ...
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59 views

Is it possible to permanently save the Edit Widget for a Postgis layer?

Is there a way of configure the editing type for a POSTGIS layer through Edit Plugin and do not lose the changes after remove the layer or exit the program?
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872 views

why preview image is blank for ImageMosaicJDBC (postgis raster) layer?

I follow http://docs.geotools.org/latest/userguide/library/coverage/pgraster.html to publish a ImageMosaicJDBC layer in geoserver. the layer seems published ok and saved, but the preview of this layer ...
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340 views

From pgRouting shortest_path back to osm node id

I'm successfully performing path finding queries like shortest_path on data imported with osm2pgrouting. The tables I have inside my pgrouting DB are the following: List of relations ...
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282 views

Error recognising password; importing OSM to PostGIS in QGIS

When selecting OSM Tools (Import into PostGIS) , attching my .osm file in the Input option, selecting my OSM Database, and then clicking run, I am prompted to enter a password for connection. "Enter ...
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333 views

Postgresql Query Plugins Not Returning Results in QGIS

I'm using the Fishnet function as described here to create a grid. If I use the following SQL to call the function to position a grid where I want it (I'm using NZGD2000 SRID = 2193) the query ...
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284 views

Displaying text from dxf in Openlayers

I managed to import .dxf into Postgis table, and now have, among others, rows with Point geometries and values in text column (which corespodent with Label values from ACAD .dxf). What is the best ...
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99 views

MultiPolygon from database

I would like to know how to create an instance of a Multipoint from a PostGIS database.. I do the query , then got the ResultSet named "area" , the column with MultiPolygon attributes is named "geom" ...
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1k views

How to fire a query from OpenLayers to GeoServer to fetch 'the_geom' column in PostGIS table?

I am coloring the polygon shapes of world_country. I have OpenLayers in my UI, GeoServer as server and PostGIS as db. All I want is fire this query: select the_geom from world_country where cntryname=...
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376 views

Parcel ID Mapping (brainstorming)

In my project I have a table full of residential properties by Parcel_ID. Table 2 is a TIGER streets shapefile. I would like to build a query in MS Access displaying all properties within a mile ...
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108 views

network related issues arising when running an arcpy script

Essentially I wrote an arcpy script that is within a toolbox that I ported over to a different machine to test out after the script worked locally. The script essentially utilizes the psycopg module ...
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120 views

Symbolizing Layers from a PostGIS Database to many Client Computers

I was hoping someone could help with a symbolizing issue. I have a PostGIS database on a server with a number of layers. The layers of a series of polygons, lines and points that all share the same ...
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423 views

line segments using points

Is there a way to get line segments from a linestring using points with lat/lng coordinates? ST_Line_Substring is taking float8 start/end points. Is there a way to replace the float8 with lat/lng? I ...
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663 views

Arc by center point in PostGIS does not fit the circle

I'd like to store a GML ArcByCenterPoint in PostGIS. I can work out the start, middle and end points required by the CIRCULARSTRING type and all seems to be OK, except that when I visualise the arc it ...
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13 views

Intersection of 4D Trajectory with 4D Polyeder (3D + time)

I have worldwide small polygons (lat/lon WGS84) for different heights (z-coordinate) for several timestamps (m). I want to store them in a PostgreSQL/PostGIS database as 4D objects (2D polygons + ...
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19 views

ST_Intersects with degenerate LINESTRING

I have, in PostGIS, a bunch of LINESTRING Z object (which represent poles), and I want to find which ones are inside an area (represented by a POLYGON). For the purpose of this exercise, we can safely ...
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24 views

Using Postgresql/PostGIS/Pgrouting in PYQGIS Processing Scripts

I have started exploring PYQGIS scripts and learning writing PYQGIS user scripts in python. I want to use pgsql/postgis/postgresql in the script. Please suggest Also Can anyone suggest That the ...
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24 views

Import Corine Land Cover in PostGis

I've imported a shapefile from the Corine Land Cover dataset in PostGis. I'm working on a software which will allow for diverse simulations on the territory. This software integrates a function to ...
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38 views

PostGis - st_union polygons, keep sum of attribute

There are multiple My current query is: SELECT (ST_Dump( ST_Union( way ) )).geom AS way, 10000 AS way_pixels FROM ( SELECT way, way_pixels, ...
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63 views

Adapting a ConvexHull fonction to a ConcaveHull one

I have a database with over 150 000 points in a EPSG 2950 projection. As I wanted to cluster those points in polygons, I used a ConvexHull fonction. The goal was to create clusters where I would find ...
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42 views

How to visualize PostGIS data(geography) in QGIS?

I've created a table that stores spherical circles located all over the globe. But I'm not able to view this data in QGIS. This is my table: CREATE TABLE circles(gid serial PRIMARY KEY, the_geog ...
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44 views

How can I remove only small inner rings in PostGIS?

I am looking for a way to remove small inner rings in a large polygon. I want to remove only the ones that are below a given surface and keep the bigger ones so that the the look (from a distance) is ...
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23 views

Upload a raster in postgis

I know this might be a similar question to many others. I have been prompting multiple questions here and on google but I cant figure it out. I have a raster and I have uploaded it into postgis with ...
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23 views

3D time dimension (x,y,t)

I'm working with data points (x,y) and timestamp t as a separate attribute in my table. (x, y) are in WGS 84 latitude,longitude format while timestamp is in Unix Time. For instance (71.8, -13.5) and ...
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24 views

Setting default value in FileGDB table column during GDAL/ogr2ogr export from PostGIS?

I'm doing an export for one table (table name: 'schaden_polygon') from a PostGIS-database (db-name: 'mydata') to ESRI FileGDB via ogr2ogr commandline-tool. The PostGIS-table contains a column 'm_uuid' ...