Node-RED block in Snap4City Microservice library node-red-contrib-snap4city-user is "point-within-polygon">
    <p>It allows to check if a given point is inside a predetermined polygon.</p>

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

    <dl class="message-properties">
        <dt>polygon
            <span class="property-type">string</span>
        </dt>
        <dd> “&lt;WKT_string>” for a geographic path described as Well Known Text</dd>
        <dt>pointlatitude
            <span class="property-type">string</span>
        </dt>
        <dd> latitude of the point to check</dd>
        <dt>pointlongitude
            <span class="property-type">number</span>
        </dt>
        <dd> longitude of the point to check</dd>
    </dl>

    <h3>Outputs</h3>
        true if the point is inside the polygon area, false otherwise

    <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>