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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1answer
131 views

Problem with runing a loop in a query in PostGIS

I am new to PostGIS and I have a question which can't solve. I have a table of buildings each having a value for number of people living in it. I would like to calculate the total value (sum of number ...
2
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3answers
212 views

Problem with result of query in PostGIS

I run the following query and irrelevant of the point coordinates and radius I always recieve all the records of the table I'm querying. Can anyone point out what the problem could be with this query? ...
2
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1answer
986 views

PostGIS: How to ST_Clip() a raster with a polygon?

I have done: Import a SHP file into PostGIS by PostGIS SHP loader GUI. Import a raster into PostGIS: \raster2pgsql -I -s 4326 landsat.TIF -t 500x500 public.landsat > query.sql After importing ...
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1answer
224 views

Problem with using a circle as polygon for querying PostGIS

I'm trying to query PostGIS and find some object features that intersect with a circular buffer created by the user using OpenLayers, JavaScript and PHP. I use the following code for creating the ...
2
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1answer
517 views

Problem with reading data from PostGIS as KML file using PHP

I am using the following PHP code in order to read data from PostGIS and save it in KML format as a file. When I load the page a document with ".PHP" extension is returned (not .kml) which inside has ...
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2answers
681 views

Problem in running query on PostGIS using PHP

Would you kindly help me solving this problem. I'm trying to use the PHP code provided here in order to read geo-data from PostGIS. The code seems clear without any problem (also nobody has ...
6
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1answer
3k views

Add PostGIS spatial functions to a custom schema other than “public” in PostgreSQL

I am new to PostgreSQL and PostGIS. Recently, I created a PostGIS 2.0.3 database on a PostgreSQL 9.1 database server using pgAdmin. The "PostGIS" extension was found installed in "Extensions". Al ...
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1answer
7k views

Loading Shapefiles into PostGIS using shapefile import/export manager

I am a complete beginner with PostGIS. I've started learning it using the tutorials provided by Boundless. In section 4 of this tutorial where I want to import shapefile in PostGIS, I do not have the ...
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1answer
182 views

Routing result not showed up [closed]

I'm following the http://workshop.pgrouting.org/ but my routing result not showed up at all, like the picture below: my firebug also didn't give me an error, I'm using geoserver 2.4.2, postgresql ...
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5answers
1k views

Problem installing PostGIS on Ubuntu Server 13.10

I've installed PostgreSQL 9.1 and postgis on Ubuntu Server 13.10 as follows: sudo add-apt-repository-ppa:ubuntugis/ubuntugis-unstable apt-get update apt-get install postgresql-9.1-postgis then I ...
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1answer
1k views

osm2pgsql loses connection at end of import for large PBF, north-america-latest.osm.pbf

I just wanted to check and see if anybody else out there encountered this issue before I started diving into the code. I'm using osm2pgsql to import OSM data into my Postgres database. I encounter the ...
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1answer
275 views

How Do I configure PostGIS 2.0 on windows to use ST_GeomFromGeoJSON?

I have installed PostGIS 2.0 on a Postgres 9.1 database on a Windows 2012 Server. I need to write an insert query, which uses ST_GeomFromGeoJSON(). The Docs for this query say that I need - JSON-C >= ...
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1answer
62 views

Is there a way to use some sort of “instancing” when storing polygons in a spatial database?

I am quite new to GIS database addons, and I am still exploring the possible uses for them. In general the idea of storing objects indexed by their position which enables additional operations is ...
2
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1answer
2k views

PostGIS Select Union of Polygons

I have a Postgres 8.4 PostGIS 2.0 enabled database and I've loaded it up with a bunch of shapefiles. I'm trying to get the database to do on-the-fly unions of geometries. Here is the query I'm ...
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1answer
2k views

Copy a spatial table from one PostGIS database to another PostGIS database

I have two PostGIS databases on two different servers. The first server is PostGIS 2.0 and the second server is PostGIS 1.5. On the PostGIS 2.0 I have a table "lakes" with MULTIPOLYGON geometry ...
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2answers
386 views

ST_Length (GEOM, true) for calculating distances in Geographic Reference System

Good afternoon all, I use (1) ST_Length (ST_Transform (geom, 3395)) to get distances in meters from points in Geographic Reference Systems EPSG: 4326. The thing is I found that with (2) ST_Length ...
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1answer
352 views

GeoDjango: read geometry column in geography field

I have a Django application that needs to work with an existent PostGIS database, apart from its own database. I've configured multidatabase support, created a database router, created models for the ...
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1answer
206 views

PostGIS ST_SummaryStats

I need some help writing the sql for returning the "MEAN" value from a raster(in postgis db) that intersects a defined(inquery) polygon(in postgis db). The polygon layer is called: ...
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1answer
57 views

Where and what format GIS data is suitable for me? [closed]

I am a student on computer science.Now , I am on a competition which is to develop a taxi recommendation system for Beijing ,China. I am now looking for the GIS data of Beijing. The key step is , ...
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2answers
76 views

Select area which is at least x meters away from other geometries

In my table I have the build-up area from a region as a big number of polygons. urban_area: id | name | geometry(polygon) I was wondering if and how I would be able to find the area within a ...
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1answer
108 views

Get DISTINCT nearest neighbors with indexed search

I'm using the indexed nearest neighbor search to return the closest points to a given starting location. My points also have attributes like color and shape, stored as strings. I want each query to ...
2
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1answer
61 views

Weird behaviour of ST_Project with PostGIS2

somehow I can't understand the results of ST_Project, but maybe this problem is just me being stupid (again): Note: I use geography-type here, but the results are the same for geometry. I use a ...
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1answer
102 views

Problem with double field type in postgis database

I have connection to PostGIS spatial database through ArcSDE, and all double type numeric fields are cutting numbers after comma. Does anyone know how can I fix this problem?
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1answer
689 views

How to install pgrouting 2.x on ubuntu 12.04 LTS

I try to install pgrouting 2.0 on ubuntu 12.04 LTS with postgresql 9.2 I have ppa in the system by sudo add-apt-repository ppa:gwibber-daily/ppa answer: `You are about to add the following PPA to ...
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2answers
1k views

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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0answers
167 views

identify subgraphs within planet_osm_line table

I want to identify subgraphs within the planet_osm_line table of the osm2pgsql-schema. those subgraphs are classified by certain tags i want to check. My first attempt was to do this recursively with ...
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1answer
300 views

ImageMosaic-JDBC Error

I'm trying to get postgis raster layers in geoserver-2.3.1, with postgresql-8.4, postgis-2.0 and gt-imagemosaic-jdbc-9.1.jar support. I'm going through the tutorial with a PNG raster that i have. In ...
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0answers
288 views

Problem Installing pgRouting 2.0; libcgal8 dependency

I've been trying to install PostGIS and pgRouting on an AWS Ubuntu server (first tried 13.10, then reverted to 12.04, both 64bit "small" instance) for several days now but no matter what I do I keep ...
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1answer
445 views

Coordinate Conversion in PostGIS

I have some problem with the representation of the coordinates. I need to convert the coordinates from "EPSG: 32633" to "EPSG: 4326", and then create geometries in PostGIS. For the conversion (from ...
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1answer
187 views

PostGIS Transform distance or create a view

I have a postgis table that is updated on a regular basis so it is not practical to cast my geometry column to geography So can I modify the following query to convert a distance say 0.5k into ...
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1answer
101 views

Installation extension functions to pgRouting

I'm trying to find sql source of functions routing_dd.sql and routing_dd_wrappers.sql I'm working on Windows 7 32bit. The only one link to that wrote by Underdark is empty: Both are available ...
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1answer
5k views

How can I enable PostGIS Shapefile and DBF Loader 2.0 plugin in PgAdmin III?

I am on Windows and I want to download/enable the plugin "PostGIS Shapefile and DBF Loader 2.0". I installed PostGIS 2.0 using StackBuilder of PostgreSQL installer.
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1answer
73 views

What is the complexity of neigborhood search in PostGIS?

I have a point with coordinates x and y. I want to know all the points in a square around this point, with side L. For this, in postgresql/PostGIS, I use: SELECT * FROM table_of_points WHERE ...
3
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1answer
1k views

osm2pgsql: Import data in custom projection

I have osm-file and I want to import it to the postgresql via osm2pgsql with custom projection EPSG:20022. I look to the help and found out any keys like -E EPSG: but when I try to do with it I get ...
3
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1answer
1k views

PostGIS: Calculate the length of just the portion of linestring that intersect with a polygon

I want to calculate the portion of the linestring that lies within the limits of a polygon. Better with an image What is the length of the portion of linestring within Province A? and within ...
4
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1answer
271 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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1answer
561 views

How to calculate x, y, z, m in Postgis

Somebody know how can I calculate the x,y,z,m parameters from a MultiLineStringZM in Postgis? I would like to know x,y,z and m from the points what are made the polyline. When I try calculate it by ...
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1answer
38 views

How to join two LinestringM into one without dropping M value?

I have, for example, two Linestrings with M value: LINESTRINGM(1 0 2, 2 0 4, 4 0 7) and LINESTRINGM(4 0 7, 6 0 9, 10 0 10) How can I merge them into one Linestring and preserve the M value? Expected ...
10
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1answer
973 views

How to get the length of a line inside a polygon

How can I get the length (brown marked part) of the "Road 7" inside the red polygon? My start: SELECT ST_Length(way) FROM lines WHERE road = "Road 7" AND ST_Intersects(line, polygon)? With that, ...
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6answers
5k views

Unable to connect Postgis from QGIS 1.8.0

I have installed PostgreSQL and PostGIS on my laptop (Win 7 64 bit OS). I am running QGIS 1.8.0 on my machine . When I am trying to connect Postgis I am getting connection failed error then I tried ...
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1answer
387 views

Why postgis st_overlaps reports Qgis' “avoid intersections” generated polygon as overlapping with others?

I am implementing a postgis trigger on polygon layer to check and reject newly created polygon if it overlaps others. The problem shows when I digitize new polygons adjacent to others in Quantum GIS ...
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2answers
440 views

Postgis 2.0 - How to get a Point from given LinestringM and a measure?

If I have a cable route linear referenced and stored in a LinestringM with M value is the length (in meters) from the start of the route - for example: LINESTRING M (0 0 0, 10 0 20, 12 0 40, 20 0 50, ...
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2answers
75 views

Adding shp files to PostGIS in QGIS 2

I followed this tutorial to set up Postgresql 9.1 and PostGIS 2 on my Ubuntu Server 12.04. I also installed pgAdmin III on my Windows 7 client. I set up a database landarch and user chadmwade, ...
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285 views

Split lines at polygon intersection with attributes saving

This relates to this question but what about keeping the attributes. Having line_layer (id, geom, attribute1, attribute2) poly_layer (id, geom, attribute3, attribute4) How do I split the lines ...
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1answer
95 views

pgrouting 2: missing pgr_findnearestnodedwithin function

With the PgRouting 1.5 I was using the find_nearest_node_within_distance function and it works, but now I'm moving the project to PgRouting 2 + Postgis 2 + PostgreSQL 9.1, and now that function, I ...
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1answer
454 views

Pgrouting functions and geoms type not found. Install failed?

I have installed a postgresql 9.1 and postgis 2.0 from source. I couldn't launch this : # Add pgRouting launchpad repository ("stable" or "unstable") sudo add-apt-repository ...
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0answers
65 views

Selecting a bounded area within a raster

I am new to postgresql. I have imported a 256kb sample raster (.tiff) into postgres with tilesize 100x100. Now I need to select the area (rectangle) from the center of the image using sql query. Then ...
0
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1answer
276 views

How to run ST_Intersects on a geometry from text and an existing table

I am developing a location based application that stores longitude and latitude coordinates in a string. I then (using PostGIS 2.0) need to use these coordinates and run ST_Intersects on it with the ...
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0answers
74 views

Is it possible to have run-time dynamic table updates to visualization using javascript interacting with postgis and geoserver

I have an idea of/have seen implementations, of dynamic map retrieval/updating using wms on openlayers by using updates to a postgis database which was hooked into geoserver and having a refresh ...
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0answers
19 views

Can't connect QGIS 2.0 to postgresql 9.3 remote server with postgis 2.1 [duplicate]

I am trying to connect qgis to my postgresql server using the add postgis layer option in qgis dufour. I am not getting any details from qgis other then 'connection failed check settings.' However, ...