What are the types of geometry in GeoJSON?
The geometry of the first feature is of type Point; that of the second is of type LineString; and that of the third is of type Polygon . You can use SQL/JSON query functions and conditions to examine GeoJSON data or to project parts of it as non-JSON data, including as Oracle Spatial and Graph SDO_GEOMETRY object-type instances.
How to create GeoJSON Index on array data?
Create an on-statement, refreshable materialized view of the array data, and place that view in memory . Create a spatial index on the array data. This is shown in Example 22-6 and Example 22-7. You can convert Oracle Spatial and Graph SDO_GEOMETRY object-type instances to GeoJSON objects and GeoJSON objects to SDO_GEOMETRY instances.
How to use JSON to select field geometry?
This example uses SQL/JSON function json_value to select the value of field geometry from the first element of array features. The value is returned as Oracle Spatial and Graph data, not as JSON data, that is, as an instance of PL/SQL object type SDO_GEOMETRY, not as a SQL string or LOB instance.
How to find the GeoJSON coordinates of a document?
This example selects the documents (there is only one in this table) for which the geometry field of the first features element is within 100 kilometers of a given point. The point is provided literally here (its coordinates are the longitude and latitude of San Francisco, California).
GeoJSON supports the following geometry types: Point, LineString, Polygon, MultiPoint, MultiLineString, MultiPolygon, and GeometryCollection. Features in GeoJSON contain a Geometry object and additional properties, and a FeatureCollection contains a list of Features.
How are features and featurecollections used in GeoJSON?
Features in GeoJSON contain a Geometry object and additional properties, and a FeatureCollection contains a list of Features. Leaflet supports all of the GeoJSON types above, but Features and FeatureCollections work best as they allow you to describe features with a set of properties.
Which is the best type of GeoJSON for leaflet?
Leaflet supports all of the GeoJSON types above, but Features and FeatureCollections work best as they allow you to describe features with a set of properties. We can even use these properties to style our Leaflet vectors.
What can a GeoJSON object represent in JavaScript?
A GeoJSON object may represent a region of space (a Geometry), a spatially bounded entity (a Feature), or a list of Features (a FeatureCollection).