Django is a high-level Python Web framework that encourages rapid development and clean, pragmatic design.
4
votes
1answer
395 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 ...
2
votes
3answers
274 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 ...
6
votes
1answer
336 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 ...
6
votes
1answer
242 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 ...
-1
votes
1answer
110 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 ...
3
votes
2answers
2k 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 ...
1
vote
1answer
135 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
votes
2answers
299 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 ...
1
vote
0answers
196 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 ...
1
vote
1answer
699 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 = ...
1
vote
1answer
149 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 ...
4
votes
1answer
524 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 = ...
3
votes
1answer
1k views
Why is my PostGIS query not using a 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,
...
2
votes
1answer
355 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 ...
1
vote
1answer
434 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
votes
3answers
655 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 ...
3
votes
1answer
346 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 ...
2
votes
2answers
828 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
votes
1answer
485 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 ...
1
vote
2answers
510 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 ...
4
votes
1answer
605 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 = ...
5
votes
5answers
606 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 ...
4
votes
1answer
518 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
votes
1answer
299 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
votes
1answer
880 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, ...
4
votes
1answer
314 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: ...
1
vote
2answers
404 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
votes
3answers
300 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 ...
5
votes
1answer
446 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 ...
