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 update data with ST_Tile

I need to update tiled raster data from the "whole image". I have created this query: UPDATE data_tiled AS t SET raw_data = f.raw_data FROM ( SELECT data_time, data_type, ST_Tile(raw_data, 250, ...
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14 views

PostGIS tiger geocoder installation trouble

I am getting the TIGER geocoding feature set up on my windows 7 64 bit box (PostGIS 2.1; Postgres 9.4). I followed the steps outlined here to generate the batch scripts and ran them last night: ...
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1answer
1k views

Error saving polygon with hibernate spatial and postgis

I'm trying to persist a com.vividsolutions.jts.geom.Polygon in my PostgreSQL (with PostGIS enabled) database, using Hibernate and Hibernate-Spatial plugin. Caused by: ...
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1answer
49 views

pgrouting tsp (travelling salesman problem) performance

I currently use a web API to solve TSP tasks. However my provider limits the query to a maximum of 150 stops. I therefore consider to host my own routing service based on OSM data and pgrouting. My ...
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5answers
3k views

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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1answer
558 views

How can I make a PostGIS ST_Distance_sphere query more efficient?

Within PostgreSQL/PostGIS I have written a SQL query to get the closest distance for each element within a point coordinate table from a polyline table. The query comes back and works correctly, but ...
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1answer
213 views

Ogr2ogr - shape to postgis - is there a way to use and preserve an existing primary key?

I've been struggling with this for a while, tried a few different ideas inspired by these pages: http://www.gdal.org/ogr2ogr.html http://www.gdal.org/ogr/drv_pg.html ...
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1answer
168 views

St_OffSetCurve with self-crossing lines

I have about 50,000 linestrings in PostGIS. They represent routes along roads. But I want them to be (roughly) pavements (aka sidewalks) instead. So I need to move all the lines 3 metres to the left ...
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0answers
11 views

Server Doesn't Listen Error when connecting to PostgreSQL from Client [migrated]

I have done a lot of research through the Google and have not been able to com up with a solution. I installed PostgreSQL 9.5 and PostGIS 2.1.8 On Ubunutu Server 14.04 and configured PostgreSQL as per ...
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1answer
555 views

PG::UndefinedFunction: ERROR: operator does not exist: point = unknown

Recently, I developed a feature to save and fetch points(lat and lon) from DB. It is working fine on my local, but on production database it is giving error: PG::UndefinedFunction: ERROR: operator ...
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1answer
74 views

Distance in meters between two geographic coordinates

I want to determine the distance in meters between two geographic coordinates. The points are: Lat (deg) Lon (deg) A: -33.3930906 -70.5452765 B: -33.3993212 -70.5468767 So if i calc the ...
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1answer
34 views

pgsql2shp error: table does not exist

I am exporting tables from Postgresql 9.2 to shapefiles using postgis 2.0. I have the same system on other machines and it works correctly. I have tried running the command from a prompt and get an ...
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2answers
2k views

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. ...
15
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5answers
13k views

Error when trying to run Create Extension postgis

I have installed PostgreSQL 9.x and PostGIS 1.5/2.0 several times and have never had this problem. I just got a new CentOS 6.3 server up and running and and I have Postgres 9.3 functioning as ...
17
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1answer
3k views

Comparison of geocoding solutions (such as Gisgraphy & PostGIS 2.0) [closed]

As I am sure many of you are aware, PostGIS has finally released Version 2.0 and included within this version they have also built a geocoder (see: http://postgis.net/docs/Extras.html). Although I ...
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2answers
63 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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3answers
3k views

Intersecting a raster with a polygon using PostGIS - artefact error

I'm using PostGIS2.0 to do some raster/polygon intersections. I'm having difficulty understanding which operation I should use, and what the quickest way of performing this is. My problem is as ...
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0answers
232 views

Working with ambiguous AddGeometryColumn functions

I'm using PostGIS to add geometry columns to tables, but keep receiving the error: ERROR: function addgeometrycolumn(character varying, character varying, integer, character varying, integer) is not ...
2
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1answer
310 views

Creating GeoJSON from Postgres

We are transitioning from Google Maps to Mapbox. Mapbox is a proponent of geoJSON and uses it extensively, so we are considering adopting it for all of our maps. An issue is the creation of the ...
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2answers
38 views

PostGIS - raster and bands

I have several images from different times and for every time I have three types of image (temperatureA, temperatureB, pressure). Should I store them as every time as band in a single raster with N ...
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0answers
48 views

Dijkstra's Algorithm direction issue

I am trying to implement Dijkstra's algorithm, my query is working fine if I set direction parameter to false. I have to consider the direction of travel while calculating route from point A to point ...
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1answer
39 views

postgis - wrong ST_Distance with geography points [closed]

I'm trying to calculate the distance between to geographical points, but the calculated distance is bigger than the real one (from Google Maps). The location column in postgresql is define as ...
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0answers
18 views

Add bands or new raster column in Postgis?

Would it be faster to work with a new band or a new raster column for a raster dataset in Postgres with new pixel values, assuming that the size, extent and everything else relevant remains constant? ...
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2answers
211 views

Is there a way to change ST_asGeoJSON return values?

The function ST_asGeoJSON returns something like: "st_asgeojson": { "type":"MultiLineString", "coordinates":[ [ [-3.13512629299993,39.7174353130001], ...
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2answers
40 views

Finding vertex in comon with most polygons in PostGIS?

I have a table with polygon geometry, in this case representing counties. I'm trying to figure out how to write a query that returns vertices sorted by the number of polygons that share that vertex. ...
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1answer
242 views

Delete all data from a PostGIS topology

I need to delete everything (faces, nodes, edges, anything I'm not thinking of) from a PostGIS topology, but I want to keep my database schema (schemas, tables, columns, sequences, etc.) intact. Is ...
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1answer
47 views

transform geometry PostGIS column with unknown geometry type

I run PostgreSQL 9.1 and PostGIS 2.0. I have a table that contains one geometry column. But that column contains point, polygons lines, etc. So I set it like so, ALTER TABLE jake ADD COLUMN ...
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0answers
246 views

PostGIS 2.0 st_geomfromgml using LineString fails with invalid GML representation

I am attempting to insert a geometry into a table using the st_geomfromgml function. The GML is being sourced from a Geoserver WFS request. The function call looks like this ...
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1answer
274 views

Hitting Memory Limits of PostGIS ST_ConcaveHull / Incomplete Shrink Wrap

I am trying to use PostGIS 2.0 on Postgres 8.4 to do some mapping. I am working with the NOAA Shapefiles, specifically their US States & Territories file located here: ...
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0answers
36 views

Resuming an osm2pgsql import to postgres [closed]

I was doing an import of the north american data with osm2pgsql using sudo ./osm2pgsql -c -S /home/osmNA/nfs/osmNA/osm2pgsql/default.style --slim -d addressNA --flat-nodes flat-nodes.bin ...
2
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1answer
72 views

Postgis: intersection between geometry and geography

I am trying to detect if a geometry and a geography intersect or not. The problem is I cannot find such a method. There only is: boolean ST_Intersects( geometry geomA , geometry geomB ); boolean ...
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1answer
47 views

How do I intersect a point with a shape?

I have a table in Postgresql / PostGIS containing county geometries. This table was created by importing a shapefile. I verified the geometry was imported successfully by importing the table into QGIS ...
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1answer
43 views

function st_length3d(geometry) does not exist

Whenever I execute this query: SELECT ST_Length3D(ST_GeomFromEWKT('LINESTRING(0 0 0,5 0 3,5 10 5)')); Postgresql is throwing an error: ERROR: function st_length3d(geometry) does not exist SQL ...
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0answers
222 views

PostGIS is already installed in schema 'public', uninstall it first

I am having problems adding postgis to my database. I'm following the instructions from here: http://postgis.net/docs/postgis_installation.html#idp32328352 (That said, I have combined some previous ...
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1answer
82 views

How to check overlap between two sets of Linestrings using postgis

I have 2 sets of LINESTRINGS, each set containing around 50 LINESTRINGS(which form a road), how do I check whether these two sets overlap or not ? Thanks in advance.
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2answers
177 views

Trouble using ST_Difference to remove overlapping features

I am trying to use ST_Difference to create a set of polygons (processing.trimmedparcelsnew) that do not contain any of the area covered by another set of polygons (test.single_geometry_1) using ...
4
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1answer
2k views

How to design model in Django using GeoDjango?

I am using Postgresql 9.0 and PostGIS 2.0. I am using Django 1.3 and GeoDjango. I have a model with id, latitude, longitude and placename. All the places are in the USA. My requirement is following: ...
2
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1answer
29 views

postGIS SQL request with aggregating ST_Union()

I have a postGIS table that looks like this : id | value | geometry(MultiPolygon) 1 10 ... 1 20 ... 1 30 ... 2 10 ... 2 20 ... 2 30 ...
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1answer
70 views

A few PgRouting database design questions

Does someone know how the cost field in PgRouting is calculated? What are 'source' and 'target' good for? 'osm_source_id' and 'osm_target_id' contain the same information using different numbers. Is ...
2
votes
2answers
399 views

Collecting multipolygons into a single multipolygon with ST_Collect() in PostGIS

I would like to collect 50,000 individual multipolygons into one big multipolygon. Unfortunately when I perform ST_Collect(geom) it bundles them into a geometry collection and cannot be cast as ...
3
votes
2answers
426 views

Cleaning geometries in PostGIS?

I am trying to do some processing on some very large polygon layers. However I am running into various geometry errors such as: NOTICE: Ring Self-intersection at or near point 470396.52017068537 ...
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1answer
66 views

Set Tolerance in Postgis

is there anyway to set tolerance in Postgis, in Arcgis tolerance is the minimum distance which could separate two points, if the distance between them is smaller than the tolerance so the points are ...
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0answers
68 views

Can QGIS handle EMPTY geometries?

I am writing a plugin and have a postgis table which has EMPTY geometries in the geom column. MULTILINESTRING EMPTY I am having crashes which just close QGIS. I have narrowed it down to the EMPTY ...
0
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1answer
61 views

Problem importing sqlite into Postgres (with PostGis) using ogr2ogr

I am trying to import a very large sqlite file into Postgres SQL 9.3. The first tool I tried to use was OGR2GUI (http://www.ogr2gui.ca/). The 64 Bit version does nothing, whilst the 32 bit version ...
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0answers
53 views

How do I design a database for storing GPX tracks and supporting spatial queries? [duplicate]

I have a series of GPX files that contain 1...n tracks. Each track contains roughly 5k - 10k points. The GPX files do not contain waypoints or routes. I want to design a database with the following ...
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1answer
75 views

ST_Dwithin Source Code

I am looking for the st_dwithin postgis source code. I want to learn the way postgis determines whether a given geometry is within a given radius to another geometry.
4
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1answer
216 views

Updating SRID (Update_GeometrySRID) does not alter polygons (when it should)

I am trying to change the SRID of polygons layer, but I'm having trouble visualizing the result. I the SRID is misreported the shapefile I used to import into PostGIS. The metadata says the ...
3
votes
1answer
514 views

PostGIS: ERROR: lwpoly_from_lwlines: shell must have at least 4 points

I have achieved to close lines in order to build a polygon with: st_addpoint( st_makeline(geom ORDER BY .cd_noseq), st_pointn( st_makeline(geom ORDER BY cd_noseq), 1) ) but ...
8
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1answer
144 views

Building a polygon over a reachable area

I am currently working in the field of isochrones and the underlying algorithms. What now causes problems is not the calculation if the isochrone itself, but the visualization of the results. The ...
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3answers
2k views

How to find lat/lon values for every pixel in a GeoTIFF file?

I want to a store GeoTIFF file pixel by pixel in the database. I need to store pixel values along with the lat/lon of that pixel on the GeoTIFF image. Is it possible to do that?