Calculating the Distance Between Two Locations

Purpose

This example demonstrates how to calculate the distance between two locations via the siddhi-gpl-execution-geo extension.

Before you begin:

1. Download the siddhi-gpl-execution-geo-x.x.x.jar and place it in the <SI_HOME>/lib directory.
   
2. Save this sample in WSO2 Integrator: SI.

Executing the Sample

To execute the sample open the saved Siddhi application in WSO2 Integrator: SI, and start it by clicking the Start button (shown below) or by clicking Run > Run.

If the Siddhi application starts successfully, the following message appears in the console.

GeoDistanceCalculation.siddhi - Started Successfully!

Testing the Sample

To test the sample application, simulate a single event for it as follows:

1. To open the Event Simulator, click the Event Simulator icon.

   

   This opens the event simulation panel.

2. To simulate events for the LocationPointsStream stream of the GeoDistanceCalculation Siddhi application, enter information in the Single Simulation tab of the event simulation panel as follows.

   Field	Value
   Siddhi App Name	GeoDistanceCalculation
   StreamName	LocationPointsStream

   

   As a result, the attributes of the GeoDistanceCalculation stream appear in the panel.

3. Enter attribute values as follows.

.

Attribute	Value
latitude	8.116553
longitude	77.523679
prevLatitude	9.850047
prevLongitude	98.597177

1. Send the event.

Viewing the Results

The following output is logged in the WSO2 Integrator: SI console for the single event you simulated.

INFO {io.siddhi.core.query.processor.stream.LogStreamProcessor} - GeoDistanceCalculation: Event :, StreamEvent{ timestamp=1513616078228, beforeWindowData=null, onAfterWindowData=null, outputData=[2322119.848252557], type=CURRENT, next=null}

Click here to view the sample Siddhi application.

@App:name("GeoDistanceCalculation")

@App:description('This will demonstrate the distance between two locations')

define stream LocationPointsStream (latitude double, longitude double, prevLatitude double, prevLongitude double);

@sink(type='log')
define stream DistanceStream (distance double);

@info(name = 'query1')
from LocationPointsStream
select geo:distance(latitude, longitude, prevLatitude, prevLongitude) as distance
insert into DistanceStream;

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Last update: May 14, 2026