We would use below stack...

• Python
• Django
• Django Rest Framework
• Postgres (with postgis extension)

...a small caveat

• Longitude is x
• Latitude is y
• ...not the other way around

(30,15)

Geometry Types

• Point
• LineString
• Polygon

Simple Types

Collection Types

• MultiPoint
• MultiLineString
• MultiPolygon
• GeometryCollection

Point as GeoJson

Linestring as GeoJson

Polygon as GeoJson

Our System Architecture

Geos API

• GEOS stands for Geometry Engine - Open Source
• GeoDjango has its own implementation of the GEOS library.
• The geometries are defined in django.contrib.gis.geos module. e.g.

  • Point(5, 23)
    

  • LineString((0, 0), (0, 50), (50, 50), (50, 0), (0, 0))
    

  • Polygon( ((0.0, 0.0), (0.0, 50.0), (50.0, 50.0), (50.0, 0.0), (0.0, 0.0)) )
    

GEOS Predicate Functions

.contains

• It checks if a geometry is inside another geometry.
• Invoked as geometry1.contains(geometry2)

GEOS Predicate Functions

...others

• .covers(geom)
• .intersects(geom)
• .touches(geom)

GEOS methods & properties

.distance

• Returns the distance between the closest point in this geometry and the other geometry
• Invoked as geometry1.distance(geometry2)

...others

GEOS methods & properties

• .area
• .extent
• .length
• .transform(900913, clone=True)

GIS ORM (QuerySet) API

contains

Factory.objects.filter(geofence__contains=geom)

intersects

GIS ORM (QuerySet) API

Factory.objects.filter(geofence__intersects=geom)

GIS ORM (QuerySet) API

...others

• overlaps

• bboverlaps

• bbcontains

• etc.

Thank You