equals (Function)

Two available sets of parameters:

• First set returns true if the incoming geo.json.geometry event equals the given geo.json.geometryFence.
• Second set returns true if the location pointed by longitude and latitude equals the given geo.json.geometryFence.

Syntax

<BOOL> geo:equals(<DOUBLE> longitude, <DOUBLE> latitude, <STRING> geo.json.geometry.fence)
<BOOL> geo:equals(<STRING> geo.json.geometry, <STRING> geo.json.geometry.fence)

Query Parameters

Name	Description	Possible Data Types	Optional	Dynamic
longitude	Longitude of the geo location.	DOUBLE	Yes	Yes
latitude	Latitude of the geo location.	DOUBLE	Yes	Yes
geo.json.geometry	String that contains geometry type and coordinates for a GeoJSON geometry.	String	Yes	Yes
geo.json.geometry.fence	String that contains geometry type and coordinates for a GeoJSON geometry fence.	String	No	Yes

Example 1

geo:equals( 
    {'type':'Polygon','coordinates':[[[0.5, 0.5],[0.5, 1.5],[1.5, 1.5],[1.5, 0.5],[0.5, 0.5]]]} , 
    {'type':'Polygon','coordinates':[[[10, 10],[10, 11],[11, 11],[11, 10],[10, 10]]]}
)

The geo:equals() function in this query is used to compare two GeoJSON geometries to check if they are equal. In this specific case, it compares two polygons. The first polygon is defined by the coordinates [[0.5, 0.5],[0.5, 1.5],[1.5, 1.5],[1.5, 0.5],[0.5, 0.5]] and the second one is defined by [[10, 10],[10, 11],[11, 11],[11, 10],[10, 10]]. The function returns false because these two polygons do not have the same coordinates, hence they are not equal.

Example 2

geo:equals(10.5, 20.5, {'type':'Polygon','coordinates':[[[0, 0],[0, 1],[1, 1],[1, 0],[0, 0]]]})

This query uses the geo:equals() function to compare a point specified by its coordinates (10.5, 20.5) with a GeoJSON polygon defined by the coordinates [[0, 0],[0, 1],[1, 1],[1, 0],[0, 0]]. The function checks if the point and the polygon are equal, which in this case they are not, as they don't share the same type (point vs polygon) and identical coordinates, hence the function returns false.

Example 3

CREATE STREAM GeoStream (geometry1 string, geometry2 string);
CREATE SINK STREAM EqualsStream (isEqual bool);

@info(name = 'CheckGeometryEquality')
INSERT INTO EqualsStream
SELECT geo:equals(geometry1, geometry2) AS isEqual
FROM GeoStream;

This stream worker example has two streams: GeoStream for input and EqualsStream for output. The GeoStream is set to receive pairs of GeoJSON geometries.

The 'CheckGeometryEquality' query operates on the GeoStream. For each event in this stream, the geo:equals(geometry1, geometry2) function compares the two provided GeoJSON geometries to see if they are equal. The result of this comparison, a boolean value indicating whether the geometries are equal, is then inserted into the EqualsStream.

This stream worker can be used for continuous real-time comparisons of GeoJSON geometries received in the GeoStream.