Django is a high-level Python Web framework that encourages rapid development and clean, pragmatic design.

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GeoDjango / PostGIS - Cut geometry by bounding box

I am looking for a solution to retrieve the geometry(ies) from a polygon/multipolygon within a bounding box in a GeoDjango application. The application I am developing has a requirement to serve out ...
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52 views

OpenStreetMap layer in OSMGeoAdmin reverse coordinates

In my django application I have a map displayed when I'm in the admin thanks to the class OSMGeoAdmin (from django.contrib.gis.admin) the only problem is that this map kind of reverse the GPS ...
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1answer
133 views

How do I use polygon centroids within a GeoQuerySet?

I have two models: neighbourhoods and boroughs, each containing a polygon field. I am trying to construct a QuerySet that will give me the neighbourhoods within a given borough. I expected to use ...
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26 views

Mapserver mapscript map inset

What is the recommended way to produce a map similar to the one in http://www.nexusenergy.com.au/6468050/nexus-energy-oil-gas-exploration-and-productio.htm I would like to dynamically create the ...
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4answers
473 views

How to use PostGIS to handle complex geoprocessing workflows?

Our organization is considering moving our geoprocessing workflow to PostGIS. We are currently using ArcGIS, with a plethora of custom Python tools used in ModelBuilder. We're moving most of our data ...
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2answers
239 views

Shapefile postgis database to be queried by GeoDjango

I would like to create a Postgres database (postgreslq-9.1 and postgis-2.0.2) storing several shapefiles but I am uncertain on how to implement it so I'm searching for some advices. I have already ...
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1answer
156 views

Geodjango InspectDB Fails on Postgis Raster_Columns View

I am trying to generate models for an existing Postgresql database using the Django InspectDB command. Models are produced but a failure occurs on the raster_columns view. The error is: Exception: ...
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189 views

Is there a Python WMS client (thin client analogue of OpenLayers)?

I'm making a geoportal based on (Geo)Django 1.5, PostgreSQL 9.1 + PostGIS 2.0, QGIS MapServer and OpenStreet Map or Google Maps WMS services for the base layer. It seems like there is no problem, but ...
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2answers
896 views

DatabaseError: Coordinate values are out of range [-180 -90, 180 90] for GEOGRAHY type

I am using Django 1.3, PostGIS 2.0 , Postgresql 9.0 and GeoDjango. I had a database with a table for places. This table had latitude and longitude for places in the US. I enabled this database with ...
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1answer
78 views

Should states/provinces be stored as geographic or geometric data types?

While reading the GeoDjango documentation, they advise using geometric rather than the geographic data type when storing values that are on a continental scale. The Canadian province of Ontario, for ...
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1answer
79 views

What are lazy geometries

What are "Lazy Geometries"? How are they different from other types of geometries? I'm an experienced Python/Django developer but am very new to the world of GIS, and understand that this is a ...
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1answer
84 views

Anyone recognize this (reference-system related?) pattern of distortion?

I'm new to GIS and was making some progress until getting rather stumped on this one. I've imported what I believe to be lat/lon data based on US FIPS county codes in weather alerts (NOAA SPC). When ...
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1answer
164 views

GeoDjango - How to secure tile map services?

I use geodjango to create and serve tiles that I usually display into OpenLayers as openLayers.Layer.TMS I am worried that anybody could grab the tms URL and plug it into their own map without asking ...
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1answer
189 views

Save longitude and latitude in Django

I had plotted a Javascript gMap.Using the marker,the values of latitude and longitude are displayed.I need to get that values and save it to database.What is the best way to do this and ,How to ...
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1answer
124 views

Geodjango - User's uploaded shapefiles and model creation

I have a big interrogation about how it could be possible to have a GeoDjango app that can store in database the uploaded shapefiles (or other geospatial files) from users. When you load shapefiles in ...
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1answer
240 views

Mapnik - Weird tiles rendering when used with spatialite

I use Mapnik in an GeoDjango App with Spatialite 4.0 as backend. There is something weird with the tiles that I suspect might be related with a bad handling of mbr with spatialite. If you look at ...
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4answers
259 views

Coordinates conversion doubt

In QGIS do I have a EPSG:4326 shapefile that shows the coordinates "-7148300 -3688500" and I need them in the format -64º -31º for further processing in a geodjango app. However using ogrinfo I get ...
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60 views

django floppy forms geospatial widgets error

I'm trying to define a view that lets the user edit the data in the database, I'm using floppyforms, because of its geodjango widgets which is part of the form that i would want the user to use for ...
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1answer
1k views

Pros and cons of using Ruby/Rails/RGeo or Python/GeoDjango for a web based GIS

We're at the investigation phase of creating a web based GIS. We're assessing options for an ORM to use in all of our backend import/export and processing routines. From my research, GeoDjango appears ...
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187 views

mapnik error - fatal flex scanner internal error--end of buffer missed

I am using Mapnik 2.0.1rc0 on a Windows 7 with python 2.7 32bits inside a GeoDjango App. I often got this error: fatal flex scanner internal error--end of buffer missed that makes python to crash ...
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1answer
86 views

GeoDjango - Use GDAL python binding in the shell

I would like to use the GDAL python binding in my GeoDjango site. The aim of this is to use ogr2ogr capabilities in a script. I am on windows 7 so I have installed GDAL-1.9.2.win32-py2.7 downloaded ...
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140 views

GeoDjango - DatabaseError: no such table: spatial_ref_sys with Spatialite

Im going through the GeoDjango Tutorial. I have loaded the WorldBorders shapefile into Spatialite. I can do spatial queries such contains, intersects, but I have a DatabaseError: no such table: ...
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111 views

Problems combining (union) Multipolygons in geodjango

I'm using geodjango and postgis (1.x), What is the best way to combine (union) a list of multipolygons. in what i assume is rather inefficient i'm looping trough like this combined = multipolygon ...
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2answers
110 views

Spatialite as a DBMS-server with GeoDjango?

I would like to add a spatial component to my Django application. I turned out to GeoDjango immediatly. I am wondering now if spatialite could be used as DBMS-server for an application in Prod. Grosso ...
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325 views

Get the distance between 2 WGS84 GEOSGeometries

I currently want to check if 2 given GEOSGeometry objects of type Point are within 100m of each other. (length flexible) Looking at previous asked questions on this topic, most of the answers were ...
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1k views

Can Polygons be generalized to MultiPolygons in GeoDjango?

I set up a model with models.PolygonField in geodjango, using postgres as database. I try to import shp into postgres. The problem is, shp (compiled with QGIS) mixes polygon and multipolygon, hence it ...
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1answer
159 views

How to configure and install psycogpg2 - beginner?

I need to install psycogpg2 for working with 'django'. I read the instructions but I dont understand whether to run the commands in command prompt or in python command line. I am lot used to the GUI ...
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105 views

Missing tiles when django application is hosted on an apache server

I'm building a GIS application using Django as my web framework and OpenLayers to implement a slippy map interface. I was initially using the django runserver for development and everything was ...
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1answer
133 views

Get Lat & Lng from GeoDjango OSMGeoAdmin

Django OSMGeoAdmin with PointField uses OpenLayers and it's hard to use. I want to add 2 new input elements which are lat and lng. Using jQuery, when values of the input elements are change, I want ...
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2answers
443 views

Checking if a point is in a circle

I'm using shapely to check if a point is in a polygon, but I also need to check if a point is in a circle. Checking the docs, I don't see how do that... Maybe I could create a circle? circle = ...
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1answer
492 views

GeoDjango Changing My Coordinates

I'm running into a problem when saving a coordinate into one of my models in (Geo)Django. My point field is setup as: location = PointField(blank=True, null = True) So while running some tests in ...
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1answer
291 views

GeoDjango admin: how to use a WMS background other than the default OSM or VMAP0

The standard GeoDjango admin has a basic VMAP0 background. OsmGeoAdmin adds an OSM background. How do I replace the background map with another WMS? In the source code of the admin OpenLayers ...
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2answers
956 views

General GeoDjango Opinion

I'm forced to crawl out of my intranet and create a public GIS site with quite an extensive dataset. All of my data is contained within PostGIS. I started dabbling with Geoserver/Postgis/OpenLayers ...
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1answer
504 views

How to set up GeoDjango with PostGIS 2.0?

I would like to run GeoDjango (Django 1.4) with Postgis 2.0. Whenever I try to run syncdb I get the following error for geographic fields: Failed to install index for stores.Store model: operator ...
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3answers
280 views

How to import an Access database to GeoDjango?

I'm a I've just inherited a pile of institutional geodata that's stored in an MS Access database. I need to pull that data out into a format that I can work with in GeoDjango--so I'm OK with ...
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1answer
248 views

How to mix coordinate systems in GeoDjango?

This is a beginner question about working with different coordinate systems in GeoDjango. I've got a GeoDjango object with a polygon field, stored as OSGB coordinates: class Region(models.Model): ...
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4answers
362 views

How to compute geodesic area in GeoDjango?

I have some polygons which can be anywhere in the world. I would like to compute their areas. The GeoDjango docs for GEOSGeometry.area don't specify whether it is geometric or geodesic area, but ...
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1answer
799 views

Django client install postgresql/postgis on Ubuntu 12.04

Does anyone know what apt packages one should install for a postgres(8.4)/postgis(1.5) django (1.4) client on ubuntu 12.04? All recipes seem to assume that I want to install the full ...
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2answers
137 views

Why are the results different for the same point using GEOS Point.transform and Postgis ST_Transform?

I'm trying to define a default point setting for OSM layers in my application and I want users to be able to define the default latitude and longitude in EPSG:4326. What I'm doing right now is to use ...
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2answers
560 views

GeoDjango Order by distance for Model that is linked to User who has a location on their user profile

I need to order my query model by distance, however the point field in question is not on the model class but on the user profile and the i am getting an error when attempting the following. g = ...
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2answers
327 views

Geodjango - using projected coordinates with olwidget

I have a database in GeoDjango containing data based on the Australian MGA54 coordinate system (SRID 28354). I have the srid set in the model definintions and when using the standard GeoModelAdmin ...
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2answers
918 views

Django PolygonField: how to display on map?

Extremely beginner question. I have a GeoDjango model with a MultiPolygonField. How do I retrieve the value of this field and display it as a polygon on a map? class county(models.Model): cd = ...
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2answers
510 views

Usage of GeoDjango

We are creating a website that displays geographic data on map (currently using Google Maps js API). We are currently using postgres + postGIS + php. It has been recommended that I look into usage ...
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2answers
297 views

Invoke PostGIS functions outside of the database? Need to force 3D in GeoDjango

I'm looking to ensure that all geometries saved to the database are three-dimensional. It's easy enough to do with a call to the database, select ST_Force_3D( ST_GeomFromText( blah blah ) ) ...but ...
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1answer
193 views

Optimize GEOSGeometry's spatial operations by avoiding thread-safety checks

A ranking algorithm I'm developing for a Django webapp requires performing spatial operations (within, intersections, sym_difference, etc.) using a query against large number of geometry objects. ...
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1answer
232 views

geodjango slowness and debugging

I'm using geodjango + postgres to display polygons from tigerline on a map. Pretty simple stuff so far. My issue is that when I use the GPolygon object: django.contrib.gis.maps.google.GPolygon there ...
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2answers
799 views

Generating GeoJSON tiles from GeoDjango - basic overview?

I'm working with the glorious PolyMaps and I want to build a map similar to the population example. I understand that this needs GeoJSON tiles. I have a GeoDjango database, with a bunch of County ...
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4answers
2k views

Geodjango- get the distance between 2 points

Sorry to be asking yet another geodjango newbie question. What I want to do is quite simple, I have 2 locations defined by gps coords, lat / long like returned by google maps: ...
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1answer
1k 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 model with id,latitude,longitude and placename. All the places are in USA. My requirement is following - User ...
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1answer
1k views

How to verify a PostGIS installation on OS X?

I am trying to set up GeoDjango and installing PostGIS on my mac and when I am trying to ./configure I am getting this error checking PostgreSQL version... PostgreSQL 8.4.9 checking libpq-fe.h ...