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

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Clustering the WGS84 point features (projection transformation aspects)

My question is quite trivial and was discussed many times before (like here) but in our case it has the confounding extra requirements... The list of sparsely distributed 2d point features is stored ...
2
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1answer
512 views

how to convert kml to wkt using geodjango or python?

in geodjango i found that i can use WKT to insert geometry such as: pnt = GEOSGeometry('POINT(5 23)') but it doesn't show how to do it if the data is KML, as my data is in kml format, so my plan is ...
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0answers
59 views

GeoDjango WebMapping Application Update

According to the below GIS.SE questions, GeoDjango was the preferred framework for creating simple and quick webmap applications. But these questions are now all 2-3 years old. Can we verify whether ...
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0answers
137 views

Adding marker on a leaflet map

I'm very new to GIS and for learning I started with building a simple web app with GeoDjango. I am using dango-leaflet. Since I have a very limited knowledge I am facing many challenges. I'm trying to ...
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1answer
1k views

Geodjango - trying to get points within a polygon

I'm going through the Geodjango tutorial and trying to implement in my own project - I have loaded data from a shapefile into my model/database and I have a separate model that has a PointField. I am ...
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1answer
272 views

40k+ points from Shapefile, clustering them and populating on Google Maps/Webapp

I just started a new Python/Django webapp job related to GIS (and i'm totally new to GIS). Here is my task and what i have found so far, and i am stuck as to finding out what's the best way or the ...
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0answers
170 views

GeoDjango order_by('distance') not working as expected?

Using GeoDjango, I am trying to sort a list of users based on the distance from a point. It does generate a list, but its not ordered by distance, though I specify that in my query. This is the query ...
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0answers
224 views

GDAL Installation help in windows

I'm trying to build a GIS application in Django Framework. I completed the GeoDjango installtion (postresql, spatial libraries). I installed OSgeo4W in my C drive. I also setup environment ...
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2answers
493 views

Python library or algorithm to generate arc geometry from three coordinate pairs?

I'm trying to write code to generate fixtures for a django/geodjango project. I need to generate geometry for arcs (line string) given three lat/long pairs; start of arc, end of arc and centre of arc. ...
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0answers
124 views

Geodjango transform introduces large errors

Apologies for the possibly naive question. I'm trying to understand how Geodjango (running on PostGIS) deals with coordinate transformations, and am experiencing some unusual behaviour. Let's say I ...
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1answer
108 views

Data interoperability json refresh

I am using ArcGIS 10.2.2 with the data interoperability extension. I am also building a web app using python, django and django-rest-framework. I'm building a json api that i can add to arcmap using ...
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2answers
150 views

Can't get SRS from PostGIS using Proj4 text

I'm having a problem transforming a point from the Australian MGA UTM datum (eg MGA Zone 51 http://spatialreference.org/ref/epsg/28351/) to WGS84 using GeoDjango. I've narrowed that down to a problem ...
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1answer
2k views

GeoDjango Admin: Adding PointField latitude and longitude to other fields

I've been redesigning my application to allow users to set markers more easily. One thing I need to include for backwards compatibility purposes is that the new model must have a latitude and ...
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1answer
234 views

Nokia HERE maps SRID

I'm just beginning with GeoDjango and just came across with term SRID. What I've understood so far is that I'd need to know a little something about the map projection to for example calculate ...
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1answer
2k views

How to use Google Maps projection with GeoDjango/PostGIS

I am building a web service with GeoDjango which involves user submitted events including a location. I created a model field for my location using django.contrib.gis.db: location = ...
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1answer
189 views

GeoDjango error: Only numeric values of degree units are allowed on geographic DWithin queries

I'm trying to get N points within 5000 meters of a certain point. My database is Postgres(PostGIS). I have a model like this: class Theatre(models.Model): geom = models.PointField(srid=4326, ...
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1answer
537 views

GeoDjango: transform() not working?

I have a point: pnt = GEOSGeometry('POINT({0} {1})'.format(lon, lat)), and tried pnt.transform(900913), and it gives error: GEOSException: Calling transform() with no SRID set is not supported Then ...
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1answer
2k views

Getting “Points of LinearRing do not form a closed linestring”

I downloaded the data provided here as KML, exported to ESRI Shapefile format, checked it on QGIS and everything looked fine. Upon trying to use the layermapping utility of Geodjango I am getting ...
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3answers
472 views

Geodjango read raster files

I am developing a web app in geodjango (django) framework but I need to import raster files. Is it possible a geodjango app read raster files from a directory? Thanks
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1answer
61 views

GeoDjango Scale/Layers issue?

I've been having issues visualising data from a shapefile in GeoDjango using OpenStreetMaps. I believe it's some sort of a scale issue because of how it appears(as you can see in the screenshot of the ...
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0answers
164 views

Adding GIS feature into an existing postgis table using django 1.6

i am using Django 1.6 on my web map. the problem i got is that i cannot import shapefile with features about 200. . the console has given me this traceback. . Saved: 162-05-0001-005-31 Saved: ...
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1answer
78 views

geodjango + OL bbox strategy

I managed to learn the fundamentals of Django, GeoDjango and know OpenLayers for a while. Now I realize a project with a lot of objects with point geometries. To make the user map fast and responsive, ...
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0answers
263 views

django---error in displaying data and displaying it on the map

. i am trying to display a feature queried from postgis. . i also designed a user input field to enter the id of the desired feature to be displayed. . i have already queried the attributes first ...
2
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1answer
320 views

Cache geodjango query with bounding box filter

Im using geodjango (postgis) to retrieve points contained inside a bounding box (made by leafletjs), it works so nice, but now I want to cache this query. A tipical query is one like this: ...
2
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1answer
2k views

Transform projection from EPSG:4326 into EPSG:900913

. i've got this problem about projection. .i just wanted to know what am i missing. . i already displayed map base layer using openlayers through base_layer = new OpenLayers.Layer.WMS( "OpenLayers ...
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1answer
550 views

overlay my shapefiles stored in database to the web/browser [duplicate]

I am very much strrugling on how to display my shapefiles stored in postgis database to the browser or to the web.. is there anyone there knows how to do it.? I am using geodjango framework in ...
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1answer
235 views

Retrieving polygon shapes from postgis database and display it to the browser

I have a codes that will convert polygon shapes that is stored in the database into kml format and count all the rows in it and display it to the browser. models.py #my model in creating fields in my ...
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1answer
199 views

retrieving polygon shapes from postgis in geodjango [closed]

Can anyone explain how to extract polygon shapes that are stored in a PostGIS database and display it in the browser? I am using geodjango framework in python. I would like a step by step guide on ...
3
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2answers
437 views

Distance between Paris and San Francisco with PostGis (out of range coordinates?)

SELECT ST_Distance(gg1, gg2) As spheroid_dist, ST_Distance(gg1, gg2, false) As sphere_dist FROM (SELECT ST_GeographyFromText('SRID=4326;POINT(37 -122)') As gg1, ...
3
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1answer
313 views

GeoDjango: read geometry column in geography field

I have a Django application that needs to work with an existent PostGIS database, apart from its own database. I've configured multidatabase support, created a database router, created models for the ...
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1answer
243 views

Geodjango render_to_kml Multipolygons - Can be fast or faster as WMS?

I am learning now geodjango. I made basic web app with postgis database. With openlayers iam displaying basic wms map and I want to add other layers from my postgis database. I use render_to_kml ...
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1answer
195 views

How could I generate a CRS field inside the GeoJSON object created by Leaflet layer.toGeoJSON?

I'm using Leaflet to transform some drawn polygons to GeoJSON and send them to a backend. But the GeoJSON objects generated by layer.toGeoJSON are like this: { "type":"Feature", "properties":{}, ...
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0answers
50 views

Most efficient way of passing values from OGRGeometry to ModelField in geodjango

I am writing a custom parser that maps shapefile data to a geodjango model in a Django 1.6 project. To read the shapefile I use the DataSource object from django.contrib.gis.gdal, which provides ...
2
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1answer
398 views

GeoDjango - return SRID of geometry in GeoQuerySet

I'm wondering if there is a function in GeoDjango which would allow me to determine the SRID of a geometry column in a GeoQuerySet. I know I could do it with a raw SQL query (I'm using PostGIS) but I ...
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3answers
283 views

How should I implement a many-to-many relationship in a web mapping application?

Scenario: I am given a layer of point locations called "problems." These will be displayed on a web map. Users will then use the web map interface to create and populate field information for a point ...
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0answers
289 views

GeoDjango with MongoDB

Has anyone had experience successfully deploying GeoDjango with MongoDB? Is it possible? If so, how is it as simple as as installing the non-relational fork of Django and setting MongoDB as the ...
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1answer
260 views

Load partial shapefile into Postgis / GeoDjango project

I have a shapefile with Canadian postal codes, but am only looking to load a small subset of the data. I can load the entire data file and use SQL or Django queries to prune the data, but the load ...
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1answer
1k views

Geodjango: Using Lat / Lon to Buffer from Point

I want to have a radius based distance search. To do this, I want to create a buffer around a point object so that I can filter objects that are inside this buffer, a method that I learned based on a ...
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1answer
447 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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0answers
34 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 ...
3
votes
1answer
576 views

How to configure tilecache on nginx

I am running a geodjango application with mapnik and tilecache. Currently tilecache is run on another server to decrease the load on the application server. The application server has nginx as the ...
9
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4answers
955 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 ...
3
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0answers
355 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 ...
0
votes
3answers
866 views

OpenLayers + GeoJSON from a django server does not display features

I'm having trouble with the vector layer for my little project, here's the snippet of the javascript block var map; function init(){ map = new OpenLayers.Map('map', { ...
3
votes
1answer
95 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 ...
5
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1answer
96 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
86 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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3answers
2k views

OpenLayers dynamic map width inside Bootstrap tabs

I have the following layout, produced with Django and Bootsrap frameworks: some tabs with inside each one of them other 3 sub-tabs. In every first sub-tab I have an OpenLayers-2.13 map. This is what ...
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1answer
266 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 ...
0
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1answer
278 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 ...