Django空间字段类型之间的区别

Question

我将在我的项目中使用Spatial fields之一，但我不知道所有这些之间的区别，Django documentation有两个示例（PolygonField和RasterField）

模型：

from django.contrib.gis.db import models

class Zipcode(models.Model):
    code = models.CharField(max_length=5)
    poly = models.PolygonField()

class Elevation(models.Model):
    name = models.CharField(max_length=100)
    rast = models.RasterField()

数据库api示例：

>>> from zipcode.models import Zipcode
>>> z = Zipcode(code=77096, poly='POLYGON(( 10 10, 10 20, 20 20, 20 15, 10 10))')
>>> z.save()

>>> from elevation.models import Elevation
>>> dem = Elevation(name='Volcano', rast='/path/to/raster/volcano.tif')
>>> dem.save()

我想要other fields的示例代码来理解它们：

    GeometryField
    PointField
    LineStringField
    MultiPointField
    MultiLineStringField
    MultiPolygonField
    GeometryCollectionField