geodjango

问题 Assume that I have the following model: class Person: id = models.BigAutoField(primary_key=True) name = models.CharField(max_length=150) location = models.PointField() How would I go by obtaining the k nearest neighbors (KNN) by location using geodjango? Would I have to write custom SQL for that? I am using PostgreSQL with PostGIS. 回答1: You can use a raw() sql query to utilize postgis order_by operators: <-> which gets the nearest neighbor using the centers of the bounding boxes to calculate

问题 Assume that I have the following model: class Person: id = models.BigAutoField(primary_key=True) name = models.CharField(max_length=150) location = models.PointField() How would I go by obtaining the k nearest neighbors (KNN) by location using geodjango? Would I have to write custom SQL for that? I am using PostgreSQL with PostGIS. 回答1: You can use a raw() sql query to utilize postgis order_by operators: <-> which gets the nearest neighbor using the centers of the bounding boxes to calculate

问题 Assume that I have the following model: class Person: id = models.BigAutoField(primary_key=True) name = models.CharField(max_length=150) location = models.PointField() How would I go by obtaining the k nearest neighbors (KNN) by location using geodjango? Would I have to write custom SQL for that? I am using PostgreSQL with PostGIS. 回答1: You can use a raw() sql query to utilize postgis order_by operators: <-> which gets the nearest neighbor using the centers of the bounding boxes to calculate

问题 I have searched long and far for a solution that is up to date and specific to my problem but have yet not found a solution or a clear documentation on what I really need to do in order to flatten a relationship to become geojson compliant. This question is almost identical to mine, however the solutions or answers does not solve the problem and still produces invalid GeoJSON. django-rest-framework-gis related field Related Set serializer geo_field as PointField from another model - Django

来源： https://stackoverflow.com/questions/48839817/cannot-find-the-geomanager-in-module-django-contrib-gis-db-models-in-django-2-0

问题 I am just learning the geo-django. I can find out the distance of all places from a point. But when I use .values method to the annotated distance field, I am getting TypeError: Object of type 'Distance' is not JSON serializable Here is my code snippets #models.py import uuid from django.contrib.gis.db import models from django.contrib.gis.db.models.functions import Distance from django.contrib.gis.geos import Point class PlaceManager(models.GeoManager): def get_queryset(self): qs = super

问题 I want to store my users location using longitude and latitude, at the moment this comes from Google Maps, but I will be using GeoDango and some point to work out distances between to points also. However, my first confusion is which field in Django I should be using to store the longitude and latitude values? The information I'm getting is conflicting. The official documentation uses a FloatField https://docs.djangoproject.com/en/dev/ref/contrib/gis/tutorial/#geographic-models lon = models

问题 I'm building a website with Django and I need to have a GPS coordinate attribute in my User model. I will be using GeoDjango, which needs PostgreSQL and, since my website is already working with the sqlite3 default database, I need to install a PostgreSQL database to the project in order to create a Coordinates model in it and link it to the User model of the SQLite database. I found lots of tutorials on the internet about "how to use multiple databases" but they are all very basics. Since I

问题 I'm building a website with Django and I need to have a GPS coordinate attribute in my User model. I will be using GeoDjango, which needs PostgreSQL and, since my website is already working with the sqlite3 default database, I need to install a PostgreSQL database to the project in order to create a Coordinates model in it and link it to the User model of the SQLite database. I found lots of tutorials on the internet about "how to use multiple databases" but they are all very basics. Since I

问题 I have 2 model in django a zone and a shop, models are like this: from django.contrib.gis.db import models from django.contrib.gis.geos import Point from django.contrib.gis.measure import D from location_field.models.spatial import LocationField class Zone(models.Model): name = models.CharField(max_length=200) location_point = LocationField(based_fields=['city'], zoom=7, default=Point(51.67, 32.65)) radius = models.IntegerField(default=1000) # radius in meters class Shop(models.Model): name =