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

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PostGIS convert geography(Point,4326) to GPS

I got a database with a column of type geography(Point,4326), the data contained looks like 0101000020E610000092E057F66EF73140930035B56CBD4840. How can I convert it to GPS coordinates?
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1answer
1k views

PostgreSQL : finding all lines intersecting with a polygon

I am totally new in the world of GIS but as a student surveyor I am working on a project using postgreSQL and PostGIS. I have one database with all the roads of my country (lines), and one database ...
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0answers
337 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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1answer
29 views

Preprocess OSM streets to see if query points fall “on” them

I am interested in the following query: Given a set of query points ($\leq 10$), how many of them have distance at most $s$ meters to the closest point on the closest street. What's the most ...
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3answers
1k views

Why can't I open postgis layers in QGIS?

I've set up a table in PostGIS using OSM data (converted using osm2pgsql). I know this database is good, because I'm able to import it and work with it in TileMill, but whenever I try to interact with ...
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0answers
849 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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1answer
242 views

osm2pgsql Ways importing very slowly in .pbf, much slower than .osm

I'm currently importing the planet-latest.osm.pbf file I downloaded from ftp://ftp.spline.de/pub/openstreetmap/pbf/planet-latest.osm.pbf some time last week. I'm importing it using the following ...
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1answer
235 views

Convert a raster to GeoJSON polygons in PostGIS

I'm trying to convert a raster to a polygon and export it from PostGIS as GeoJSON. Specifically I want each pixel to be a polygon with associated the raster value. PostGIS seems to have a few ...
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1answer
140 views

Coloring multilinestringzm M values in QGIS

I have output from a geophysical technique that produces X,Y,Z and scalar value for millions of points, which have been stitched together appropriately (by networkx if it matters) into ...
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1answer
2k views

Having trouble connecting QGIS with postgres database with postgis extension [closed]

I am working on Ubuntu Precise with postgresql version 9.3 and postgis 2.0. After initially starting my postgres database and eventually getting permission errors that would prevent postgres from ...
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1answer
173 views

PostGIS GML round trip confusion

I've investigated the issue of coordinate order in GML and each time I think I've got it but I find my self confused once again. I think some of my confusion may be to do with PostGIS. Doing a ...
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1answer
183 views

Databases supporting intersection of multipolygons and a set of points

Currently we use PostGIS to store thousands of MULTIPOLYGONs and we can then use ST_Intersects to return any that rows contain any point in an input collection of points. Are there any other open ...
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1answer
178 views

How to change table name of command raster2pgsql

I am completely newbie with GIS and PostGIS as well I'm trying to load raster into postgreSQL with raster2pgsql. It runs well. However, the table name of the raster is generated automatically. For ...
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2answers
176 views

Did I set up Tiger Geocoder incorrectly?

I set up Tiger Geocoder in PostGIS on my local box (PostGIS 2.1.3, PostgreSQL 9.3.5, Tiger 2013 data). The problem I'm running into is that on almost every street most of the points are clustered, ...
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1answer
275 views

Why is the QGIS 2.2 database tab missing?

I have recently installed QGIS-2.2.0 but the Database tab in the top-menu bar is missing. It looks the main reason is missing libgdal1h library. But when I am installing it, it's removing Postgresql-9....
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1answer
3k views

PostGIS Column has Z dimension but geometry does not

I am able to create a geomtry column for 3d multiline using this: CREATE TABLE trajectories ( gid serial NOT NULL, vehid character varying(10), state integer, geom geometry(...
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2answers
3k views

QGIS: using postgis can I define a layer using sql?

I have a vector layer (call it master) that is stored in postgis and consists of a number of line segments. I also have a collection of sub layers that consist of subsets of the master layer. I can ...
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1answer
270 views

Using PostGIS functions in ArcGIS Desktop for Layer Definition Query?

I am connecting ArcGIS Desktop 10.2 to Postgis 2.0.3 with PostgreSQL 9.2.4. No SDE. I can load data with no problems and access the data in ArcMap. However I can't seem to use PostGIS functions within ...
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1answer
453 views

Cannot load postgis layer from sql string in pyqgis

I'm trying to load a layer using the following code in qgis python console: sql = "(select the_geom, ID from mytable)" uri = QgsDataSourceURI() uri.setConnection("localhost","5432","mydb","postgres","...
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1answer
640 views

Accessing PostGIS raster data using Query Layer in ArcGIS Desktop?

I tried to load raster file (jpg) into post gis using the syntax provided here "C:\Program Files (x86)\PostgreSQL\9.1\bin>raster2pgsql -I -C -e -Y -F -s 102003 -t 300x300 ras_test.tif ras_test1 | psql ...
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2answers
485 views

ST_ShortestLine gives different results for 4326 and 900913 projections. Which is correct?

I'm trying to get my head around how ST_ShortestLine (and ST_Distance and ST_LineLocatePoint) work with different projections. The result for the shortest line differs depending on which projection I ...
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1answer
613 views

Problem connecting to localhost PostGIS

When I try to connect to a small localhost PostGIS database using QGIS, I get the error message: FATAL: no pg_hba.conf for host "fe80::4528:3236:418a9e7b%10" user "postgres", database "nyc", SSL off ...
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1answer
2k views

GeoTools and PostGIS with ESPG:3857

I'm trying to use both PostGIS and GeoTools with the same ESPG:3857 projection, however, it looks like the projections in PostGIS and GeoTools differ. This is what I have in PostGIS: PROJCS["WGS 84 ...
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1answer
883 views

Spatial joining syntax

A standard PostGIS point-in-polygon query might look like this. (example tutorial) SELECT p.*,b.polyname FROM points p, shapes s WHERE ST_Within(p.the_geom,s.the_geom) Imagine this was not a ...
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1answer
165 views

How do I get the vector and raster metadata from a PostGIS database?

im using php/postgres/postgis in a webapp, im wondering if its possible to get metadata from the db about all shp/geotiff table like (name, projection, type(ship/tiff), date, desc, owner etc ...) i ...
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1answer
175 views

SDO_Inside equivalent in PostGIS for 3D objects

I am looking for a solution for querying a point whether it is located inside a 3D object or not. If the point is located on the surface of 3D, I could use ST_3DIntersects or ST_3DIntersection. But, ...
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175 views

Is there any VRP solver in Pgrouting 2.0?

after looking at older posts and googling for a while i guess there is not vrp solver (multiple trucks). there was DARP in pgr1.x but i can't see it in 2.x. i found a lot of information on https://...
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2answers
736 views

Can Geoserver return the raster value of a lat/lon point

I have a GeoTIFF published by Geoserver 2.2 and being used by Leaflet via WMS. How can I get Geoserver to return the raster value at a lat/long point? I'm guessing it has to do with using WCS, but ...
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1answer
690 views

The minimum bounding circle of geometry that crosses the 180th meridian

Background: I've been given a task where I have to calculate the minimum bounding circle of Alaska (for the purpose of running a Roeck test). I'm using the Census' state level geometries available ...
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1answer
4k views

Basic MapServer query of PostgreSQL/PostGIS database

I've just installed MapServer on a linux server and I am trying to understand how to display a basic map using a PostGIS database. I have displayed a shapefile in the browser, so I know that the ...
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Geoserver : create a rasterized polygon / dynamic fill for polygons with features from database

I decided to post here because I couldn't find any answer to my problems on the internet. So I am using geoserver 2.7-SNAPSHOT, everything is working fine but I need to implement a new function or ...
2
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1answer
321 views

Loading raster in postgis and link it with an existing table

Relatively new to PostGIS and I am currently exploring the options to make one of my PostgreSQL Tables spatial. Essentially I want to store a raster object in a table that also contains essential ...
2
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1answer
104 views

Redefining the border of a polygon in Postgis

I have a PostGIS algorithm that writes a table with "pixelated" polygons, that I will call "clusters". My idea is to smooth the edges of these clusters using concave hulls (ST_ConcaveHull). To do ...
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1answer
120 views

QGIS select reversed geometries

I have a road network and a geometry for each road direction. One Geometry from A->B and another Geometry from B->A. This geometries are covering each other. Is there a tool available in QGIS to ...
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1answer
314 views

When would a PostGIS geometry compare using ~= return true when ST_Equals returns false?

I have a couple of featureclasses in a 10.2 geodatabase/PostgreSQL 9.2.2 database and I've been struggling with the FeatureCompare tool--it is telling me geometries are different on some features ...
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1answer
1k views

How can I fix QGIS PostGIS Manager error 'shp2pgsql' is not recognized?

I have QGIS 1.8.0 installed via OSGeo Installer and work on win 7. All I need is to upload the shapefile to the database via this plugin. Unfortunately I am receiving an error: Something's wrong: ["'...
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3answers
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adding non spatial attributes using geoserver

I am using Openlayers + geoext to perform transaction operations in postgis database using geoserver . i can insert spatial data into postgis but cannot insert other data like road name, road type in ...
2
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1answer
709 views

How to calculate the shortest distance for multiple source and targets using PgRouting?

I have a table with points and a road network which includes driveways (where you enter the highway). I want to find the point which is closest to a driveway. So I was thinking I can calculate the ...
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4answers
2k views

Finding center point of MULTILINESTRING using PostGIS?

How to find the center point of MULTILINESTRING, which lies on the multiline? I am using SQL in PostGIS
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2answers
636 views

unable to call shp2pgsql using python

I am unable to call shp2pgsql using python as I have to pass various options like (-s -a -i) and I am not getting the required output .. Method I am using is p1 = subprocess.Popen(["cmd", "/C", "...
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6answers
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Error importing Shapefile to PostGIS using Importer GUI

I'm trying to import a shapefile into a PostGIS database using the graphical importer. I just installed POSTGRESQL, and PostGIS. The GUI looks like this: After testing that my database worked, I ...
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3answers
757 views

Failing to build PostGIS on OS X 10.7 Lion

I am trying to install postGIS from source to match the default install of postgreSQL on OS X 10.7. I installed GEOS and PORJ.4 from Kyngchaos and ran $export MACOSX_DEPLOYMENT_TARGET=10.7 $export ...
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1answer
52 views

QGIS 2.14.3 export PostGIS layer to dxf issue

I am trying to export a PostGIS layer to dxf in QGIS (2.14.3) via Project>DXF-Export using the following settings (German GUI): When I open the resulting dxf in DWG TrueView 2016 I see nothing, but ...
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1answer
148 views

Error with TileMill and OpenStreetMap Carto project

I have been trying to load the OpenStreetMap carto project in order to export tiles for use on our in house GIS Server. I have followed all the instructions up to loading the osm xml into postGIS and ...
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2answers
181 views

Rasters loaded in Postgres/PostGIS using raster2pgsql contain blank lines

I recently set up an Ubuntu Server as a Postgres/PostGIS database server. In an effort to serve a collection of aerial photos to my colleagues, I loaded 608 GeoTiffs (non-overlapping 1km tiles each ~...
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1answer
69 views

Creating polygons (squares) from point using PostGIS?

I want to create a regular grid of polygons/squares from this point knowing that between two successive points 100 meters, so each square would have 100*100 m2 in its area.
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1answer
327 views

Convert string column back to geometry column?

I had a table with a column set to 'point' in doctrine2, but this was changed to 'string' and updated. I can't change it back to 'point' in doctrine2, I get an error: [Doctrine\DBAL\Exception\...
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4answers
2k views

How do I stop the map at just one world/globe?

I am working on a project to put google maps layer and adding our data layers on top of it. using openlayers and google maps layer with out layer of top of it now the google layer has max resolution ...
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0answers
125 views

What is wrong with my WFS-T protocol setup?

So I want to transfer some Vector Layer Features from javascript code to my geoserver and then to postGIS, my code looks like this: saveStrategy = new OpenLayers.Strategy.Save(); ...
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How can I use ST_Contains/ST_Overlaps with non-simple lines?

Following the SQL of the accepted answer to How to get smallest line segments from intersection + difference of multiple overlapping lines? copied below. I'm having some difficulties assign the ids of ...