GeoJson format-ApsaraDB for HBase(Hbase)-阿里云帮助中心

The HBase Ganos REST API uses the GeoJson format to describe spatio-temporal data.

A typical spatio-temporal point, such as a trajectory point, uses the following format:

{
  "type": "Feature",
  "geometry": {
    "type": "Point",
    "coordinates": [125.6, 10.1]
  },
  "properties": {
    "name": "Dinagat Islands",
    "dtg": 1536041936000,
    "id":  "1"
  }
}

The data has three parts:

Temporal data: Stored in properties.dtg. The example shows a timestamp in milliseconds, represented as a 13-digit integer.
Spatial data: The geometry.type indicates that the data is a point. The geometry.coordinates provides the longitude and latitude of the point.
Other properties: Stored in the properties object. These describe the attributes of the point, such as properties.name and properties.id.

GeoJson libraries

You can use the following GeoJson libraries to generate GeoJson strings.

For Java, you can use the geojson-jackson library. For basic usage, see the following example:

FeatureCollection featureCollection = new FeatureCollection();
featureCollection.add(new Feature());

String json= new ObjectMapper().writeValueAsString(featureCollection);

Python

To install the geojson package, run the following command:

    pip install geojson

Basic usage:


    point_feature = Feature(id="1",geometry=Point((1.6432, -19.123)),properties={"id":"1","dtg":1536041936000,"name": "Dinagat Islands"})

    polygon_feature = Feature(id="my_feature2",geometry=Polygon([(0,0),(0,1),(1,1),(1,0),(0,0)]),properties={"id":"2","dtg":1536041936000,"name": "Dinagat Islands"})

    feature_collection = FeatureCollection([point_feature,polygon_feature])

Note For more information, see the GEOJSON RFC.