topic Re: Get length of roads in a polygon using Arcade in Developers Questions

Get length of roads in a polygon using Arcade

KrishV — Sun, 12 Dec 2021 03:11:26 GMT

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

Re: Get length of roads in a polygon using Arcade

XanderBakker — Sun, 12 Dec 2021 03:11:28 GMT

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;‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Re: Get length of roads in a polygon using Arcade

PaulDoherty2 — Thu, 29 Aug 2024 18:04:12 GMT

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!