Geo-fencing in Quick Report App

KE

I'm trying to limit the Quick Report app so that points can only be collected if they are within a certain geographic area.

I have defined my limiting polygon within the mapView:

            ServiceFeatureTable {
                id: countyBoundary
                url: "https://hangis.hanoverva.gov/arcgis/rest/services/county_boundary/MapServer"
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

I added a geometry check within the nextPage function so it will not allow the user to proceed if the point is not within the polygon:

    function nextPage(){
        positionSource.active = false;
        app.theNewPoint = mapView.currentViewpointCenter.center;

        var withinCounty = GeometryEngine.within(app.theNewPoint, countyBoundary)
        console.log("withinCounty", withinCounty)

        if(withinCounty === true) {
            next("");
        }
        else {
            invalidGeometryAlertBox.text = qsTr("Invalid geometry. Point not within Hanover County.")
            invalidGeometryAlertBox.visible = true;
        }
    }‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

The problem is I keep getting false for withinCounty, even when the point is within the county boundary.

nakulmanocha

Hi Kristen,

There are couple of issues here

1) You need to end the url with "/0" for the ServiceFeatureTable where 0 represents the layer id

 ServiceFeatureTable {
                id: countyBoundary
                url: "https://hangis.hanoverva.gov/arcgis/rest/services/county_boundary/MapServer/0"
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

 2) GeometryEngine compares two geometries for the within operation . The countyBoundary is a layerid but you need a feature geometry within the first layer of the countyBoundary.

There are two ways to get this resolved

Faster approach (but not perfect) - Use the extent of the layer. Since your layer has only one feature you could do that. Remember extent is a rectangular envelope surrounding the actual feature geometry

GeometryEngine.within(app.theNewPoint, countyBoundary.extent)

Second approach (should give perfect results) - Is to get the first feature of the layer. From the feature you get the geometry which you should use for the GeometryEngine. In order to get the first feature you need to perform query (set where clause as "1=1" ). The result will have the Featureset and from that you can get the first feature. For more help on how to get the feature please see our FeatureLayer query sample . If you still need help with this please create a support issue and they will be able to help you further.

Thanks,

Nakul