Node-RED block in Snap4City Microservice library node-red-contrib-snap4city-user is "distance-from-coordinates">
    <p>It allows to calculate the distance in meter from two GPS Coordinates</p>

    <h3>Inputs</h3>
    A JSON with these parameters:

    <dl class="message-properties">
        <dt>sourcelatitude
            <span class="property-type">number</span>
        </dt>
        <dd> latitude of a GPS position</dd>
        <dt>sourcelongitude
            <span class="property-type">number</span>
        </dt>
        <dd> longitude of a GPS position</dd>
        <dt>destinationlatitude
            <span class="property-type">number</span>
        </dt>
        <dd> latitude of a GPS position</dd>
        <dt>destinationlongitude
            <span class="property-type">number</span>
        </dt>
        <dd> longitude of a GPS position</dd>
    </dl>

    <h3>Outputs</h3>
        Distance
            <dl class="message-properties">
                <dd> Returns the value (in meters) of the distance calculated between the two point inserted</dd>
            </dl>


    <h3>Details</h3>
    <p>The node can receive a JSON with the parameters described in the Inputs section and with them generate the output JSON.
        If the values are not present in the input JSON, these are read by those in the configuration. If they are not present
        in either part, an error is generated for the necessary parameters.</p>