Populate Road Name Arcade Expression

SNyquist

I'd like to use an Arcade Function to populate the Road Name for a Work Zone Layer based off an underlying Road layer. The issue that I'm running into is that the expression is pulling the name from an intersecting road and not from the main line that I'm digitizing along.

 

// Create a feature set using the 'All Roads' layer in the map
var roads = FeatureSetByName($map, 'All Roadways', ['MAP_LBL'])

// Intersect the current location with the road and
// get the first road
var road = First(Intersects($feature, roads))

// If the current location does intersect a feature,
// return the name of the road. Otherwise, return null
if (!IsEmpty(road)) {
return road['MAP_LBL']
} else {
return null
}

 

 

SNyquist

@ZachBodenner @gis_KIWI4 

By using the assistance of Microsoft Copilot I was able to come up with a solution. I took your solutions and applied a Buffer function to find the largest overlap. Thanks!

// 1. Access the Roads layer (with geometry)
var roadsFS = FeatureSetByName($map, 'All Roadways', ['MAP_LBL'], true);

// If no roads found in the layer, exit
if (Count(roadsFS) == 0) {
    return "No roads found in 'Roads' layer.";
}

// Define the geometry of the current feature
var featureGeometry = Geometry($feature);

// 2. Create a buffer around the current feature
var featureBuffer = Buffer(featureGeometry, 10); // Adjust buffer distance as needed

// 3. Identify all roads that intersect with the buffer
var intersectingRoads = Intersects(roadsFS, featureBuffer);

// If no roads intersect, return message
if (Count(intersectingRoads) == 0) {
    return "No intersecting roads.";
}

// 4. Find the road with the largest overlap
var maxOverlapLength = 0;
var bestRoadName = "";

// Loop through each intersecting road
for (var road in intersectingRoads) {
    // Define the geometry of the road
    var roadGeometry = Geometry(road);
    
    // Create a buffer around the road
    var roadBuffer = Buffer(roadGeometry, 10); // Adjust buffer distance as needed
    
    // Intersection returns the shared geometry
    var sharedGeom = Intersection(featureBuffer, roadBuffer);
    
    // Length of that shared geometry
    var overlapLength = Length(sharedGeom);
    
    // Update the maximum overlap road
    if (overlapLength > maxOverlapLength) {
        maxOverlapLength = overlapLength;
        bestRoadName = road['MAP_LBL'];
    }
}

// 5. Return the best matching road name
if (maxOverlapLength > 0) {
    return bestRoadName;
} else {
    // If all overlaps are basically points (e.g. T-junction), 
    // then the overlap length is 0
    return "Road overlaps only at a point (T-junction).";
}