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

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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 ...
2
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2answers
888 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
1k 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
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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0answers
21 views

Unable to create spatial database for geodjango [duplicate]

Possible Duplicate: How to verify a PostGIS installation on OS X? I am trying to install PostGIS for MacOS X and uptil now this is what i got PostGIS is now configured for ...
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0answers
85 views

Install PostGIS from beginning [duplicate]

Possible Duplicate: How to verify a PostGIS installation on OS X? Ok, so i tried installing PostGIS for MacOS X from HomeBrew. Once i started installing, brew install postgis It ...
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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 ...
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1answer
281 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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1answer
781 views

Wrap GEOS functionality into python

I've been looking on how to get GEOSExtractLine available in python. I looked into Shapely source to if it was available for it, but it's not. I'm trying to wrap this funcionality into Django, much ...
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2answers
348 views

How to handle updates to pgRouting network in webmapping environment?

I'm building an application for a client of mine that will need to create routes in a PostgreSQL database. So far so good, but I need to support edits and changes to my network and I need to support ...
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3answers
447 views

which map projection should I use to calculate distance in Poland

I'm using/learning geodjango + postgis, and I'm trying to calculate distance between 2 cities in Poland. First using WGS84/4326 I define 2 points, and then after transforming this points into ...
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4answers
3k views

Geodjango- get the distance between 2 points

What I want to do is quite simple, I have 2 locations defined by gps coords, lat / long like returned by google maps: http://gmaps-samples.googlecode.com/svn/trunk/geocoder/singlegeocode.html I need ...
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1answer
385 views

What are some good resources related to Geodjango?

I am trying to learn Geodjango. Has anyone used it in their own project? The documentation on the official site is sparse. Can someone point out the best resources helpful in learning it other than ...
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1answer
131 views

GeoPortal Managing Tool [closed]

i know in this site everybody more or less have been setup a geoportal for showing their basemaps and analysis on local or net for their workers or conserned people in the net. it is obvious that in ...
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2answers
3k views

Using OpenLayers (with OpenStreetMaps) and PostGis for rendering data acquired from GPS tracking device?

I'm researching and planing to acquire data from GPS device and store them in postGIS database, then use geodjango to process/work them out and finally chart them on a map with OpenLayers. Will these ...
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1answer
233 views

GeoDjango 'NoneType' error when using 'distance' function

I have a site that's working on our staging server but after copying it to the live server I am getting the following error when trying to perform a distance() call (code cut down to minimum) ...
3
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2answers
475 views

How to fix this spatial query in GeoDjango?

I am new to Geodjango. and I am following the steps given in https://docs.djangoproject.com/en/dev/ref/contrib/gis/tutorial/# and the steps i followed before ...
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0answers
248 views

How to Modify Polygons in GeoDjango?

Just getting acquainted with GeoDjango. Have Basic Tutorial app created with sample world data. In trying out the admin, I appreciate seeing the polygon on the map and a couple basic tools for adding ...
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3answers
309 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
207 views

Best way to exclude 0,0 from geography results (PostGIS, GeoDjango)

Using PostGis and GeoDjango with a model having a Geography field I'm trying to exclude results where the location is 0,0. I get the error PostGIS geography does not support the "exact" lookup. The ...
5
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1answer
1k views

Geodjango distance between two points appears incorrect

I want to show you something. I am using django+postgis and I am experiencing wrong distance values between two points. This is my model: class Location(models.Model): name = ...
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1answer
1k views

Using a geodjango PointField with geography=True, my distance calculations are wrong

Here's my model: class ExchangeArea(models.Model): """ An Exchange Service Area, calculated from a phone exchange and surrounding census tracts. """ coordinates = ...
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1answer
3k views

Why is PostGIS query not using spatial index?

I am having an issue with a spatial query that is not making use of indexes. My schema is: CREATE TABLE geoplanet_place ( woeid integer NOT NULL, "name" character varying(300) NOT NULL, ...
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1answer
602 views

How do I query for all polygons within a distance from a point?

Call me stupid, but somehow I couldn't figure out how to do the following. I've got a testing shapefile with 18 features, which I successfully imported into GeoDjango (1.3, running on Spatialite). As ...
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3answers
2k 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 ...
6
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2answers
968 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 ...
3
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1answer
296 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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1answer
602 views

How to segmentize/sample a LineString using geodjango (postgis/geos) and/or openlayers?

I'm trying to sample points along a linestring. The goal is to have the distance between 2 consecutive points to be at most X (eg. 50m). I'm drawing linestring in openlayers and sending it to a ...
7
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3answers
1k views

Use Esri Geoservices REST as backend for Python web framework (Django?)

I would like to know if it's feasible to use an existing Python web framework such as Django/GeoDjango as a frontend to work with Esri's Geoservices REST API? I envision developing a database engine ...
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2answers
588 views

PostGIS + pgRouting: Adding dummy links to a road network and performing routing analysis

I'm a beginner when it comes to postgis and pgrouting development. For a project I'm working on and a bit of the algorithm: I have a polygon layer that represents zones I have a line layer that ...
7
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1answer
212 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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2answers
1k views

Is it possible to do server-side (WMS) rendering / caching of vector data

I have to develop a webapp that will have to display a large number of polygons on a webpage, with complex filtering options. The source data never changes (I will simply reload a new version of the ...
2
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1answer
910 views

Area units for GEOS area property?

I'm working with GeoDjango and have a polygon in the WGS84 projection. I need to find its area in square meters. When I call polygon.area, I get some float out and I have no idea what the units of ...
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2answers
710 views

PostGIS - certain MultiPolygons cause “BOOM! Could not generate outside point!”

I've just posted this at StackOverflow and someone suggested I try here. Original: http://stackoverflow.com/q/5863859/246265 I'm trying to represent a rectangular area which crosses 180 degrees ...
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1answer
392 views

Is there a GeoDjango tutorial for GeoRSSFeeds?

I'm going through GeoDjango basics right now. Ideally, I'd like to publish a GeoRSS from a set of data I have that is already in Django's database. I know how to get a regular Feed working, but when I ...
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1answer
961 views

Best GeoDjango MySQL workaround for distance queries

I'm using mysql 5.1.50, so the distance QuerySet method is not available to me. Here is my model: class Location(models.Model): name = models.CharField(max_length='100') point = ...
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1answer
700 views

GeoDjango: Order by distance for model that has a ForeignKey relation to another model that has a PointField

Model A has a ForeignKey relation to Model B. Model B has a PointField. Is there a way to order Model A objects by distance from a POINT?
4
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1answer
335 views

Monster Spatial database server suggestions

I'm going to setup a open Mapserver w/ Openlayers, Geojango, Postgis using Postgresql. And I need some suggestions from people that have been shopping for what I need longer than I have. What would ...
4
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1answer
1k views

GeoDjango: order PointField by distance?

I've got a GeoDjango model as follows: class City(models.Model): id = models.IntegerField(primary_key=True) county = models.ForeignKey(County) location = models.PointField(null=True, ...
5
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2answers
1k 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 = ...
4
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1answer
474 views

Geodjango insert statement: psycopg2.IntegrityError: violates check constraint

Why is the following INSERT statement throwing this error? INSERT INTO domes_place (placeid, structidx, oscode) VALUES ('10', '1', 'POINT(51.121282945772 1.3138398501222)'); psycopg2.IntegrityError: ...
2
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2answers
1k views

Error adding data to Geodjango database: parse error… within geometry

I'm trying to insert some values into a Geodjango database, but getting errors. This is the table: class Place(models.Model): placeid = models.IntegerField(primary_key=True) structidx = ...
2
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3answers
322 views

UK National Grid references and GeoDjango

Newbie question. I'm trying to insert some UK National Grid references into a Django PointField defined as follows: oscode = models.PointField(srid=27700, null=True, blank=True) My question is ...
6
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1answer
642 views

Help simplifying multipolygons in geodjango

I have a few multipolygons that have several hundred points in them. I'm looking to create less complex "thumbnails" polygons. Naturally I'm attempting to use the simplify method, which is supposed ...
2
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4answers
4k views

struggling with GeoDjango install: ERROR: could not access file “$libdir/postgis-1.5”: No such file

I'm installing GeoDjango on Mac OSX. I've followed the official Mac install instructions, which all went smoothly, and am now creating a spatial database template for PostGIS. However, when I try to ...
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5answers
764 views

Getting a square mile bounding box anchored by coordinates?

Let's say I have a lat/lng coordinate pair. I want to determine the coordinates that would create a square mile box. The existing coordintae pair would be the top left of the box, and the coordinate ...