GeoDjango provides some specialized form fields and widgets in order to visually\ndisplay and edit geolocalized data on a map. By default, they use\nOpenLayers-powered maps, with a base WMS layer provided by NASA.
\nIn addition to the regular form field arguments,\nGeoDjango form fields take the following optional arguments.
\nsridLink to this heading#This is the SRID code that the field value should be transformed to. For\nexample, if the map widget SRID is different from the SRID more generally\nused by your application or database, the field will automatically convert\ninput values into that SRID.
\ngeom_typeLink to this heading#You generally shouldn't have to set or change that attribute which should\nbe setup depending on the field class. It matches the OpenGIS standard\ngeometry name.
\nGeometryFieldLink to this heading#PointFieldLink to this heading#LineStringFieldLink to this heading#PolygonFieldLink to this heading#MultiPointFieldLink to this heading#MultiLineStringFieldLink to this heading#MultiPolygonFieldLink to this heading#GeometryCollectionFieldLink to this heading#GeoDjango form widgets allow you to display and edit geographic data on a\nvisual map.\nNote that none of the currently available widgets supports 3D geometries, hence\ngeometry fields will fallback using a Textarea widget for such data.
GeoDjango widgets are template-based, so their attributes are mostly different\nfrom other Django widget attributes.
\nThe OpenGIS geometry type, generally set by the form field.
\nHeight and width of the widget map (default is 400x600).
\nSRID code used by the map (default is 4326).
\nBoolean value specifying if a textarea input showing the serialized\nrepresentation of the current geometry is visible, mainly for debugging\npurposes (default is False).
Indicates if the widget supports edition of 3D data (default is False).
The template used to render the map widget.
\nYou can pass widget attributes in the same manner that for any other Django\nwidget. For example:
\nfrom django.contrib.gis import forms\n\nclass MyGeoForm(forms.Form):\n point = forms.PointField(widget=\n forms.OSMWidget(attrs={'map_width': 800, 'map_height': 500}))\nBaseGeometryWidget
This is an abstract base widget containing the logic needed by subclasses.\nYou cannot directly use this widget for a geometry field.\nNote that the rendering of GeoDjango widgets is based on a template,\nidentified by the template_name class attribute.
OpenLayersWidget
This is the default widget used by all GeoDjango form fields.\ntemplate_name is gis/openlayers.html.
OpenLayersWidget and OSMWidget use the openlayers.js file\nhosted on the cdnjs.cloudflare.com content-delivery network. You can\nsubclass these widgets in order to specify your own version of the\nOpenLayers.js file in the js property of the inner Media class\n(see 资源作为静态定义).
OSMWidget
This widget uses an OpenStreetMap base layer to display geographic objects\non. Attributes are:
\ngis/openlayers-osm.html
The default center latitude and longitude are 47 and 5,\nrespectively, which is a location in eastern France.
The default map zoom is 12.
The OpenLayersWidget note about JavaScript file hosting above also\napplies here. See also this FAQ answer about https access to map\ntiles.