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

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Promotion radius in miles around venues using PostGIS

Bear with me as I'm new to PostGIS and GIS in general. I also don't know the domain well enough to create a good title for this post! Here is what I'm trying to accomplish: I have Venues in my ...
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1answer
1k views

SQL query to have a complete geojson feature from PostGIS

I would like to get a geojson feature with properties from PostGIS. I have found an example to have a feature collection but I can't make it works for just a feature. so far I tryed to modify the ...
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2answers
1k views

Postgis 2.1 error after update

After a usual update progress - "apt-get upgrade" - I can not connect with qGIS to my PostGIS DB anymore. Error in the qGIS logfile: Your database has no working PostGIS support. Erroneous query: ...
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343 views

Configuring Geoserver to use a specific postgis geometry column as the default

I have a PostGIS table with two geometry columns, both multipolygon but one with SRID 4326, the other 3857. When publishing the table in Geoserver, I realize that Geoserver defaults to using the first ...
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1answer
646 views

How to determine on what side of a line is a point is?

I want this in order to generate house numbers, odd or even depending on wether a feature is on one side of a street line or not . Thanks EDIT: In the end i think the most portable way is to use ...
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1k views

How to speed up Postgis raster layer display in QGIS?

i've been importing some digital orthophoto geotif files into postgis 2.0.1 via raster2pgsql tool (i also made 3 levels of an overview table - pyramid). Then i tried to import the layer into qgis via ...
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1k views

Error creating a spatial database. ERROR : could not load library “/usr/pgsql-9.1/lib/rtpostgis-2.0.so”

I am running PostgreSQL 9.1 with Postgis 2.0 on Fedora 15. When trying to install the raster support, psql -d mydb -f rtpostgis.sql -v ON_ERROR_STOP=1 I get the following error ...
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1k views

Convert KML to shapefile without losing attribute data

So I want to convert KML files to SHP shapefiles to load it onto PostGIS. Currently I'm using ogr2ogr to do the conversion for me, but it wipes out all the attribute data. How do i preserve this ...
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3answers
684 views

WFS Caching / Back button

I'm using WFS protocol on Vector layer / GeoServer / PostGIS Currently the map is refreshing and calling new requests whenever i do anything like searching or drawing and when i move back to a part ...
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1answer
215 views

How to edit a PostGIS database using ArcGIS for Desktop Add-In/Extension? (no ArcSDE)

I need to improve an existing solution to be able to do multiuser editing within a PostGIS database from ArcMap. Available for the solution is ArcGIS for Desktop 10.3 [Basic]. (No non-free Extensions ...
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277 views

PROJ4 / PostGIS transformations between WGS84 and NAD83 transformations in Alaska

I'm trying to implement the recommended WGS84 - NAD83 transformation for Alaska using PostGIS. This post: Geographic Transformations in Alaska Between NAD83 and WGS84 indicates the proper ...
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629 views

Mapnik + OpenStreetMap + Shapefile with Raster Images + Mod Tile + PostGIS

I am new to GIS. I have a Shapefile (.shp, .shx and .pbf). The .pbf file contains path to PNG files located on my machine only. I was able to save the Shp data to PostGis via Shape2Gis tool. Now ...
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3answers
2k views

What's the fastest way to do a bounding box query in PostGIS

I have a Postgres table, with almost 2 million rows, with a long-lat coordinates field in the form POINT(-73.4938 33.2405). Supposing there's a geospatial index on that field, what's the most ...
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1answer
410 views

How to install PostGIS correctly with OpenGeo Suite 4.0 community edition on Windows 7?

I have installed the OpenGeo Suite community edition, version 3, onto Windows 7 multiple times in the past, with virtually no problems. With the latest version of OpenGeo Suite (4.0.1) (which ...
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1answer
186 views

How can I move along a line (or path)?

Given a line (street, railroad, river...) I want to simulate a moviment inside this line. Example: See this picture: Say I'm in "Nagqu" and want to move to "Kunlunqial". In a time (t=0) I'm in ...
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2answers
5k views

Exporting shapefile to PostGIS database in QGIS

How do I export a vector shapefile to PostGIS database? I am asking what format I have to export it.
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2answers
349 views

Extract PostGIS line features to GPX

I have a request to provide GPX files of certain trails (around 100) that are present in OpenStreetMap. Given a local PostGIS install with OSM data, I think the process would be something like: ...
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1answer
262 views

st_clip and gdal_translate: “Error browsing database for PostGIS Raster properties” - Why?

Im using shell-script, postgis2.0 and gdal for trying to clip raster apart, using an overlapping raster and a the_geom-object. At first I create a view to clip the overlapping part of the raster. It ...
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1answer
3k views

convert list of points to line or polygon

I have a list of Points in a PostGIS table. The rows can be grouped by a date something like: myTable id INT date DATE lat NUMBER lng NUMBER geom GEOMETRY(POINT) now I need a table where all ...
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2answers
822 views

Merging polygons that intersect by more than a specified amount

I am working with a dataset that contains a subset of property boundaries in a local government area, thus my dataset is made up of several thousand properties but not all are touching. Since it is a ...
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2k views

PostGIS Error: type “geography” does not exist

I just upgraded my development machine to Windows 7 and am therefore reinstalling PostgreSQL and PostGIS. I used the Postgres Plus installer, as recommended on the Postgres website, and followed this ...
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1answer
76 views

Get points along a line at defined distance

I was reading a lot of similar questions here but no one ask about postgis (or I didn't find it). I have a line in postgis and I want to get the point along the line at defined distance. It is ...
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0answers
236 views

TileMill Exports Failing

I'm having trouble exporting my map in TileMill (v0.10.1). I'm using OSM Bright with a PostGIS database connection to import OpenStreetMap data. When exporting an SVG or PDF through the user interface ...
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1answer
165 views

Update postgres/postgis point data attribute from another enclosed polygon shapefile in QGIS

I have a placename point table in postgis with 'district' column. a districts polygon shapefile with district name in 'Name' column. See the image below. I would like to update the 'district' ...
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262 views

How do I catch PostGIS/PostgreSQL RAISE messages in QGIS?

I have a trigger set up in PostGIS/PostgreSQL which will show a RAISE WARNING when an inserted or updated polygon is within a certain distance of some predefined planning constraints. I want this ...
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1answer
138 views

PostGIS Raster: Outputting raster into GDAL supported file?

I have import a raster into my postGIS database via raster2pgsql. My raster tiled to 100x100. Now I'm trying to export (output) the raster to GDAL supported file (for example: PNG). Following the ...
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1answer
63 views

Compare features in PostGIS with updating attributes

I have two polygonal layers: "existing" and "modified". Attribute table of "existing" and "modified" layers have same column "feature_id" - number of feature. Please help me create query which write ...
2
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1answer
475 views

How to merge connected lines with same direction (PostGis)

I am looking for a way to join all lines that are connected, have the same direction, i.e. start point of one is end point of the other, and share some common attributes. In fact, I want to connect ...
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1answer
1k views

PostGIS, create line from points

I have a PostGIS table with position data of numerous vehicles and want to create lines from these points. Data can be selected by vehicle id and ordered by timestamp but how to create lines from the ...
2
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1answer
609 views

Get the lines between all points of a polygon in PostGis : avoid nested loop?

I am trying to get all the lines between the points of a polygon, by writing PostGreSQL functions. I have written the two following functions that do the job fine : the first function to get all the ...
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1answer
368 views

ST_Equals Postgis problems

I am trying to find overlapping lines using ST_EQUALS on two tables This query returns 0 rows: SELECT * FROM geom1 c, geom2 h WHERE st_equals(c.simple_geom, h.simple_geom); This query runs ...
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681 views

Create CMS system using Cartaro

The main objective for our project is to create a portal website in Drupal. On this website, people must be able to upload their geographical datasets (mostly shape files, but also xml files that ...
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2answers
518 views

How fill length and feature count in PostGIS table for each polygons

I'am new to PostGIS/PostgreSql. I have a database which containts two shape-files : polygonal layer towns and linear layer of roads To calculate the length and feature count of 'Streets' inside ...
2
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1answer
874 views

Access PostGIS Raster layer through mapserver

I am trying to use a cgi script calling mapserver to display a raster layer that is stored in a PostGIS database. However, only a blank white image is returned and I don't know where the problem is. ...
2
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1answer
596 views

How can I get the corners of a polygon in latitude and longitude?

How can I get the corners of a polygon -a square/rectangle, to be precise- in latitude-longitude format by using its geom value -or some other way, perhaps-? Thanks.
2
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1answer
546 views

PostGIS: ST_Transform function conversion problem

I'm inserting map data from a GML file with srid EPSG:27700 into a PostGIS database table with srid EPSG:4326. I'm using the ST_Transform function as in this snippet: ...
2
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1answer
960 views

geoserver wfs insert error

I keep getting an insert error from geoserver when trying to save a point, poly etc etc to my postgis table. any ideas, my code is below var Projection = new OpenLayers.Projection("EPSG:4326"); ...
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1answer
647 views

Routing Application in Windows

I am making an routing web application similar to Google Maps 'Get Direction' feature. But because of the limited control and data on GMaps, I decided to use OpenStreetMap instead. This also made me ...
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1answer
104 views

PyQGIS - load PostGIS layer as editable

I can load a PostGIS layer on QGIS' map canvas but "Toggle Editing" button comes "inactive". How can I load vector layer as editable? The code given below loads PostGIS layer on map canvas & ...
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0answers
87 views

GeoDjango: AttributeError: function 'GDALAllRegister' not found [closed]

Im trying to get started with GeoDjango. I am using this https://docs.djangoproject.com/en/1.8/ref/contrib/gis/tutorial/ tutorial. When I run "python manage.py migrate" This error occur: ...
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2answers
99 views

QGIS opening file - Very slow on POSTGIS databse with many layers

When opening a qgis file with many layers (20 or so) it takes +5 minutes to load. All the layers come from a single PostGis database. When looking into the server logs, i see that there are many ...
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2answers
993 views

How to add Geoserver WFS to Leaflet JS Application

I have a PostGIS database and have successfully consumed a table into GeoServer and published a WFS. Are there REST endpoints available for these WFS' akin to ESRI's feature services? How are ...
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1answer
178 views

How to calculate the optimum bus route using pgrouting?

My setup for my web page is OpenLayers, Postgresql/postgis and pgrouting. What I do not understand is how I am going to do the routing.I have read many tutorials but I don't understand what my next ...
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1answer
371 views

Configuring SFCGAL to PostGIS Db

I was using PostgreSQL with PostGIS and Pgrouting. Recently I needed to install SFCGAL for some extra functions for my PostGIS db. After installing SFCGAL, now I don't know how to update my PostGIS db ...
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97 views

How to compute a line intersection point in a street layer in postgis 1.4?

I have a street layer downloaded from osm. I need to calculated intersection point as we do in qgis from vector menu -> Analysis tool -> Line intersections. I am new to postgis/postgres. any how i ...
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1answer
169 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 ...
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3answers
186 views

Query to find the Intersection coordinates of multiple Polyon

I am using the below Query to find out the intersection coordinates of 2 Polygon and its working fine,but how to use or modify the query to find the intersection area coordinates for multiple(or N ...
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5answers
3k views

Unable to install the PostGIS extension to PostgreSQL on Ubuntu 12.04 LTS

I just installed Linux Ubuntu 12.04 LTS (on a virtual machine). I then successfully installed the PostgreSQL 8.4 database management system. I am now trying to install PostGIS, which is an extension ...
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1answer
693 views

From a trajectory of GPS points to a multiline segment

Given a trajectory as a sequence of GPS points I would like to create a smooth linestring representing a path where a car drove. The data is stored in postgresql: the input trajectory in a table, ...
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1answer
1k views

How to create shortest route and multiple routes service using openlayers?

I created a digital database of many important features and locations of my city. and I want to create a web application in which shortest distance between two locations can be calculated and ...