Get length of roads in a polygon using Arcade

Question

Dear All,

Is it possible, to get the Length of Roads in a polygon layer using Arcade. I tried something below:

var fs = FeatureSetByName($map, 'Roads')
//Clip(geometry, envelope)
var roadsLength = Clip(fs, $feature)

Length(roads, 'kilometers')‍‍‍‍‍‍‍‍‍‍

How can I achieve this.

Regards,

Krish

PaulDoherty2 · Answer

Thank you for posting this @XanderBakker  this is exactly what we were looking for in our Urban Search and Rescue search segment planning tool. You rock!

XanderBakker · Answer

Hi krishnavsav , See below what you can do. This code is not optimized to enhance readability, however, depending the amount of lines you have in a polygon, this could result in a performance hit, since there will be multiple requests to the server. // get the lines feature set: var lines = FeatureSetByName($map,"Tubería Acero"); // select only the lines that intersect with the polygon var relevantlines = Intersects($feature, lines); // count the overlapping lines var cnt = Count(relevantlines); // set the initial total length to 0 var totlength = 0; if (cnt > 0) { // there are overlapping lines, loop through each line for (var line in relevantlines) { // intersect the line with the polygon var lineint = Intersection(line, $feature); // add the length to the total totlength += LengthGeodetic(lineint, 'm'); } } return totlength;‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍