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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Is product purchaser in distribution area?

I am going to be using PostGIS 2 to create a lookup service. Given a point (lat/lon), I need to either find if a product can be distributed there, or b) a list of products or distributors. I am ...
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25 views

Prevent PostGIS Topology from splitting edges on line insert

I'm dealing with a large amount of road data represented with PostGIS Topology types. Anytime I add an edge over another edge, the edge is automatically split and a new node is created at the ...
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31 views

What is causing invalid spatial reference error using ogr2ogr converting PostGIS to FileGDB in a Feature Dataset?

I am trying to use ogr2ogr to convert a layer from PostGIS to a FileGDB. I want the layer to be created inside a Feature Dataset. The spatial reference of the source layer is EPSG:3500. The spatial ...
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1answer
12 views

Original Size from Tiled PostGIS Raster

Does anybody know of a quick and easy get the original height and width (rows and columns) of a tiled raster in PostGIS? Using a combination of items I know this can be calculated so just wondering ...
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1answer
61 views

Postgis is Broken after installing Nominatim

I followed Nominatim Tutorial to install PostGIS and after that I can't access PostGIS at all I already trying reinstalling and installing everything over and over again with no success. Everytime I ...
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1answer
24 views

importing shapefiles to postGIS on QGIS1.8

I am trying to import a shapefile into postgis from within QGIS 1.8. The QGIS is based on a server that is not managed by myself. I have requested an upgrade to QGIS 2.0 ...but this may take ...
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2answers
28 views

PostGIS 2.0 and Self Intersecting Features

I have a polygon feature class created by open streetmap that is returning a self intersection error. Is there a way to filter out these feature? Can I just use a sql statement to find the error ...
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1answer
111 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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30 views

Loading raster data into postgis database

i would like to add raster data to my postgis database. when i try to check if postGIS is responding to requests using the following command psql -c "SELECT PostGIS_Version()" ,i get an error message ...
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1answer
31 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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73 views

Importing a Raster into PostGIS 2.1 (Windows 7)

I am trying to learn how to import rasters into PostGIS (2.1). I have read through all the material I can find on doing this and know that the recommended tool for this is the raster2pgsql tool. I ...
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2answers
61 views

How to update PostGIS 2.1 to use `ST_DelaunayTriangles()`

The error "lwgeom_delaunay_triangulation: GEOS 3.4 or higher required" arrives on my terminal, running psql with SELECT PostGIS_Lib_Version(); -- 2.1.4 SELECT postgis_version(); -- 2.1 USE_GEOS=1 ...
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1answer
41 views

How to populate geography point using ST_MakePoint(long, lat)

I have a table called customer_campaign, and there is an empty column geom(geography) in it. So I want to fill it up by using ST_MakePoint(long, lat) in PostGIS, lat and long are two columns in the ...
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1answer
19 views

Is PostGIS-2.x raster in text format (WKT) only?

I was reading PostGIS FAQ and this tutorial. From all that I can tell, it seems that PostGIS raster is a text format, i.e. WKT or well-known-text. I was wondering if PostGIS raster data are ...
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43 views

Does qgis support postgresql range types?

I added a postgis layer with date range column in Qgis but that field is not listed in Qgis.
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1answer
27 views

Only my geometry layers are exported from spatialite to postgis

I have a spatialite database (v4.1.1 / SQlite v3.7.17) consisting of one geometry table and several attribute tables linked to the geometry table by foreign keys. I want to export all tables to a ...
2
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1answer
33 views

How to make my PostGIS vector layer in QGIS visible?

I have loaded a shp file (simple polygon with one entry) into PostgreSQL 9.3 (with extention PostGIS v2.1.3). I now want to load this layer into QGIS (v2.2.0 Valmeira) via the "load Postgis layer) ...
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12 views

What do pixeltypes in PostGIS raster mean?

I'm trying to build a raster in PostGIS from a vector layer and I was curious as to the meaning of pixeltypes in the raster geometry? How does it effect my raster?
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1answer
32 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 ...
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1answer
49 views

PostGIS query losing geometry column information

Using PostGIS I want to collect all attributes into one polygon. The old table looks like this: Column | Type ---------+------ xyz_cols | `xyz` geometry | geometry(MultipolgyonZ, 2193) Performing ...
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56 views

How to count the number of coordinates within x meters grouping by distinct ids?

I have a table "items" of about 1 million rows and 40.000 distinct ids like the following: idx | id | point | lat | lon | the_geom 1 | 1 | 76 | 51.463388 | -0.16869856 | 0101000020E... 2 | 1 | 53 | ...
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23 views

How can I associate a consistent polygon area with a set of attributes using a topology?

Consider the following topology. SELECT CreateTopology('topotestschema', 0, 0.01); CREATE TABLE topotest (id SERIAL PRIMARY KEY, data TEXT); SELECT AddTopoGeometryColumn('topotestschema', 'public', ...
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42 views

Determine PostGIS geography polygon orientation

How can you determine the orientation of a PostGIS geography polygon? I'm looking/hoping for a function that would tell me which side is the interior (left or right) as you traverse the vertices of ...
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2answers
303 views

Problem with running PostgreSQL 9.3 after installing pgRouting

I have PostgreSQL 9.3 installed on the server. It worked just fine. I also had a webservice which connected to a database. That also worked like a charm. Later, I decided to install and use pgRouting. ...
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1answer
76 views

raster2pgsql does nothing

I try to load rasters through raster2pgsql. I try to call it through pgAdmin command line, but when I call any raster2pgsql command (even raster2pgsql -G), it does nothing, I just get another line to ...
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1answer
89 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 then, when I try to make a ...
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1answer
53 views

Implementing Wrapper of PostgreSQL?

How can I implement the Wrapper of PostgreSQL? I found this useful looking wrapper from a FOSS4G routing with pgRouting Workshop but I do not know how to implement it!
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1answer
59 views

postGIS: what is more efficient: single or two-point search

I have seen different approaches to conducting searches. Which is the best approach in storing the data for database efficiency: saving both longitude and latitude points longitude latitude vs ...
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2answers
69 views

problem merging polygons based on a column value - using Spatialite

edit: as I am unfamiliar with any tools I decided to try my luck with PostGis. I imported my data. and executed the query : create merged as select delomrade_code, st_union(geometry) from grunnkrets ...
4
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1answer
75 views

Binary insert into Postgis geography column results in value being inserted as geometry

When writing WKB as a value (and as a binary parameter) to a geography column, the persisted value is not geography. Example Java is also available here: ...
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1answer
35 views

Local Coordinate System

I am currently evaluating the use of PostGIS (version 2.0) for: a project that will store 3D coordinates (x, y, z) data the data will have it's own local coordinate system which does not correspond ...
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68 views

Routes Consult with pgrouting / openlayers [closed]

I'm starting with pgrouting. After suffering a bit unable to put the data in osm postgis using osm2po with the excellent tutorial http://anitagraser.com/2011/12/15/an-osm2po-quickstart/ ran the sql ...
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1answer
28 views

Not empty geometry having blank text

i'm having problem with geometry column, for some rows i have geometry with blank text, this query will describe more the problem : select geom, ST_AsGeoJSON(geom), ST_Isvalid(geom), ST_IsEmpty(geom) ...
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1answer
28 views

Expression with postgis

I'm using mapserver and PostGis and I want to draw a geometric table in mapserver. The trouble is when I connect mapserver to PostGis and I want to draw the objects but in different colours. I mean I ...
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2answers
82 views

UpdateGeometrySRID and ST_Transform are the same thing?

UpdateGeometrySRID actually transforms the coordinate system of my data? For in the PostGIS documentation it appears the trim ST_Transform (Returns a new geometry with its coordinates transformed to ...
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70 views

Function ST_Transform postgis 2.0

I've read many forum posts on the function ST_Transform but unfortunately was unable to resolve my doubts so I posted a new question. I have a spatial table SRID = 101010 and want to transform it to ...
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1answer
48 views

Empty geometry resulting from pgrouting function

Let me start by saying I'm assuming I'm missing something very silly but I can't see it. I have a table of points and I'm trying to generate a polygon around each point that estimates a maximum of ...
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2answers
117 views

Find out whether geography point lies within geography bounds

I have three points: Point A Point SW Point NE I want to know if Point A resides within the bounds determined by points SW (for south-west coordinates) and NE (for north-east coordinates). I've ...
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1answer
97 views

Is there any random data generator supporting geometry in PostGIS?

I found few random data generators for PostgreSQL (such as this one), but none supporting PostGIS geometry type, other than point. Making points would be quite easy, but for lines with multiple nodes ...
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93 views

within using Hibernate Spatial

I'm doing this query using postgis and working properly SELECT "public".zona."id", "public".zona.zts FROM "public".zona WHERE ST_Within ( Geometry ( st_GeographyFromText ...
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3answers
207 views

ST_transform postgis

SQL within that zone is a point SELECT "public".zona.zts FROM "public".zona WHERE ST_Within ( ST_Transform ( ST_GeomFromText ( 'POINT(-30.033514 ...
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1answer
164 views

How to have PostGIS 2.1 and the Python osgeo library installed together without compiling from source?

My python application makes heavy use of the osgeo library. We're looking to upgrade from PostGIS 1.5 to PostGIS 2.1, and I'm having issues. I'm installing packages from the Ubuntu GIS PPA. Before, ...
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35 views

rasterize a geography polygon using postgis 2.1

I am still bit new to Postgis 2.1. I am trying to rasterize a polygon, meaning that I have a polygon of Syria and I want to create an empty raster that contains the shape and geography reference of ...
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1answer
42 views

Break line into 100m segments

I have a line geometry in PostGIS and I am wondering how I would break the line into 100m segments. Is there a function for this?
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60 views

pgrouting pgr_drivingdistance() query gives inconsistent results

So I have been working on a query(with the help of other stackexchangers :)) to get the edges in an isochrone from a particular point and then update the count_events field of those edges by some ...
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62 views

Displaying 3D city model from PostGIS 3D backend

I know that openlayers doesnt support 3D yet. I heard about Kartograph has 3D features but Does Kartograph support reading data from backend database especially PostGIS? I would like to create a 3D ...
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1answer
92 views

How can I find the segment of a line that lies within a polygon using Postgis?

Given a "road", represented by a line, that crosses a "state", represented by a polygon: What is the SQL query I can use to find the segment of the road that is within the state? A concrete example. ...
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2answers
76 views

How to select the cross streets in postgis spatial table?

I've used ST_Intersects and ST_Crosses but between two different tables. I have a table of streets and intersections want to know them. For example select all streets that cross the Street A. Can ...
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1answer
44 views

query to get predicted location after traveling on pgrouting route for some hours, postgis 2, postgresql 9.3

I am using Postgis 2.0 on Postgresql 9.3 on Ubuntu 14.04 x64. I am trying to find an efficient way to fulfill this routing request. So I am able to get the shortest route using the source and target ...
2
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0answers
115 views

how do I create a RESTful PostGIS web Service Framework?

I have PostGIS tables that store vectors that want to show on Google Maps. Read the post http://gis.stackexchange.com/questions/22354/how-to-display-a-postgis-table-on-google-maps But one thing that ...