topic Re: Get route m-value at point-clicked using Arcade? in ArcGIS Pro Questions

Get route m-value at point-clicked using Arcade?

NickHarvey — Sat, 11 Dec 2021 23:30:03 GMT

Hi All - I see that it is possible to access x,y,z, & m values for a custom pop-up using Arcade. The code below appears to be working in ArcGIS Pro 2.5.0 per my route layer:

var line = Geometry($feature)
var paths = line.paths;
var startingpoint = paths[0][0];
return text(startingpoint)‍‍‍‍‍‍‍‍‍‍‍‍

However, I'm not yet understanding how to return the m-value for any point along the route that was clicked, rather than the centroid or endpoints. The m-value I'm looking for appears in the pop-up panel at lower right in ArcGIS Pro 2.5.0 (see pic below).

Any assistance appreciated!

Re: Get route m-value at point-clicked using Arcade?

BenTurrell — Thu, 05 Mar 2020 23:19:54 GMT

Hey Nick Harvey‌,

Try this:

var line = Geometry($feature)
var paths = line.paths;
var startingpoint = paths[0][0]["x"];
return text(startingpoint)

Thanks,

Ben

If this answer has helpful please mark it as helpful. If this answer solved your question please mark it as the answer to help others who have the same question.

Re: Get route m-value at point-clicked using Arcade?

NickHarvey — Mon, 09 Mar 2020 13:39:27 GMT

Thanks for chiming in Ben - You're right...I can get to the m-value for the starting point of the route by replacing "x" with "m" for example...But I'm chasing the m-value for any point along the route, as it appears at the bottom of the pop-up panel at 2.5.0 where the route is clicked. My idea was to build a calculation(expression) in the pop-up which uses this m-value as a variable. The m-value is being populated at the bottom of the pop-up panel. I'm not understanding how to reference it into the pop-up body though (?).

Re: Get route m-value at point-clicked using Arcade?

Anonymous User — Wed, 13 May 2020 10:51:48 GMT

Hi Nick,
Did you make any progress with this?
I'm writing the same expression for start, end and current m values.

var line = Geometry($feature)
var paths = line.paths;
var firstpoint = paths[0][0]["m"];
var lastpoint = paths[0][Count(paths[0])-1]["m"];
var currentpoint = paths
["m"]
return text(currentpoint)

But have no idea what to put in place of the * shown above.
Is this even the correct approach to using M-values in pop-ups?

Re: Get route m-value at point-clicked using Arcade?

NickHarvey — Wed, 13 May 2020 18:36:07 GMT

Hey thanks for responding Nicholas - No progress sorry to say...Yeah, my guess is that it is not the right approach for retrieving m-values dynamically along the line because our Arcade expressions above each refer to a specific vertex (?). As my picture above depicts - m-values do show up in the standard popup though (at bottom right)...I wonder about SDK (?)

Re: Get route m-value at point-clicked using Arcade?

XanderBakker — Fri, 15 May 2020 13:37:01 GMT

Hi Nicholas Flett and nickharvey

The limitation with Arcade is that you start off with the geometry you clicked on (you M-enabled line) and not the point location of where you clicked. Therefore, it is not possible to determine at which location of the line feature you clicked when using Arcade. The SDK should allow you to do this, although the complexity of the implementation will increase.

Re: Get route m-value at point-clicked using Arcade?

DISIG — Thu, 24 Feb 2022 08:24:42 GMT

Hello Nick,

Hello everybody. I am trying to do the same dynamically in Argis Online.(my point geometry change, my m value change in the map context windows)

I want to use the cut function to get the left length of an intersecting (or nearest) line with M value in a field.

I will write more after testing all that.

i have got to 90° rotate the result of a clip between the buffer of my point and the line.

not easy...

it quite works...

/*
récupérer le cumul par intersection du point avec l'arc.
*/
var CurDep = $feature.ROUTE
var CurBuffGeom =Extent(Buffer($feature, 2, 'meters'))
var CurArcGeom = Back(Filter(FeatureSetById($map, /* tests_arcade - Test li */ "17f27378b8d-layer-3"),'route=@CurDep'))
var CUTTER = rotate(Clip(CurArcGeom,CurBuffGeom),90)
return LengthGeodetic(first(Cut(CurArcGeom, CUTTER)))

note : replaced first with back (when i flip the cutter, 90° the left part is the end part of the line.)

Re: Get route m-value at point-clicked using Arcade?

BartvanderWolf — Thu, 12 Oct 2023 19:01:38 GMT

Hi All,
Working on the same sort of workflow. I guess what would be handy is a "$clickedlocation" profile variabele. We could create the geometry object for that location and hopefully extract M and Z-values from "$feature"..

I try to create a popup for route segments exposing some route statistics. Id also would like to show the progress (M) and elevation (Z) of the clicked location. Only way I can think of to achieve this, is to convert vertices to points and do the popup on that layer.

Re: Get route m-value at point-clicked using Arcade?

DISIG — Mon, 16 Oct 2023 06:29:51 GMT

this final code work fine for me.

i pre calculate the "M" value.

// CALCUL DU CUMUL POUR UNE LIGNE

// version 1.0 2023-03-16

// variables utilisateur

var CAS = 0 ;//mettre 0 pour point de début et -1 point de fin

console("cas choisis : "+ CAS )

var SearchingLayer = FeatureSetByName($map,"ROUTE");

var TOLERANCE = 20 ;// la variable TOLERANCE de capture fixée à 5 mètres peut être ajustée si nécessaire

console("tolérance choisie : "+TOLERANCE)

// 1 - Extraction du point de calcul et recherche

var myPoint = Point({x: Geometry($feature)['paths'][CAS][CAS]['x'],y: Geometry($feature)['paths'][CAS][CAS]['y'],spatialReference: { wkid: 102100 }})

console("coordonnées de mon point : "+ myPoint)

var buff = Extent(bufferGeodetic(myPoint,TOLERANCE,'meters'));

var myGeom = myPoint;

var MySearch = Intersects(BufferGeodetic(myGeom, TOLERANCE, "meters"),SearchingLayer);

// le calcul renvoit -1 pour signifier absence de rd à proximité

if(isempty(Mysearch)){return -1}

// dans les autres cas on calcul pour le cas choisi.

if(count(Mysearch)==1){

console("cas une seule rd")

var Arc = first(Mysearch)

}

else{

console("cas plusieurs rd")

var EvDistance = Infinity;

var MyNearest;

for (var listing in MySearch){

var DynDistance = Distance(listing,myGeom, "meters");

if(DynDistance < EvDistance){

EvDistance = DynDistance;

MyNearest = listing;

var Arc = MyNearest

}

var longueur = 0;

var p = 0;

var newLine = Dictionary(text(Geometry(Arc)));

var reste = Round(LengthGeodetic(First(Cut(Arc,Rotate(clip(Arc,buff),90)))));

var cutter = Rotate(clip(Arc,buff),90);

for (p in newLine.paths){

var segment = Polyline({paths: [newLine.paths[p]],spatialReference:{latestWkid:3857,wkid:102100}})

var segLongueur = lengthGeodetic(segment,'meters')

if (intersects(segment,cutter)==true)

{return round(longueur+reste)}

else

{longueur += segLongueur;}

Re: Get route m-value at point-clicked using Arcade?

JosephJordan — Mon, 04 Nov 2024 18:35:04 GMT

This is FINALLY possible, with the addition of the $userInput profile variable! Try this:

var geom=Geometry($feature)
var densegeom=Densify(geom, 1)
var PTC=PointToCoordinate(densegeom, $userInput)
var SegNum=PTC.segmentID
var paths=densegeom.paths
var POI = paths[0][SegNum];
return round(POI.m,4)

https://www.youtube.com/watch?v=dddZTpsOjY0

Re: Get route m-value at point-clicked using Arcade?

KatyLewis — Thu, 10 Jul 2025 13:49:53 GMT

This is gold!!! Thank you so much. Now users can click along a line and get the nearest m value.

Re: Get route m-value at point-clicked using Arcade?

JosephJordan — Thu, 10 Jul 2025 16:59:46 GMT

Right??! You bet! I think ESRI has made experience widgets that work if you have Roads & Highways too....but this is nice because you don't have to click a special widget....can just make the Road ID and M value show in the regular pop up.

Re: Get route m-value at point-clicked using Arcade?

AyanPalit — Thu, 10 Jul 2025 17:12:40 GMT

Updating this old thread for tracking and community documentation. Get route m-value at point-clicked is out of the box Pro function and doesn't require any custom code.

At ArcGIS Pro 2.4, the Navigation > Explore tool included this enhancement. You can view m-values in a pop-up for a feature that contains measured values (m-values) in their geometries. The coordinate display at the bottom of the pop-up includes the m-value closest to the clicked location in the map or scene. For linear geometries, the value is calculated by interpolating between the nearest vertices.

Pop-ups for M-aware features

Re: Get route m-value at point-clicked using Arcade?

DISIG — Tue, 12 Aug 2025 12:11:09 GMT

Now that the m value is exposed in arcade the code is a bit more easy 🙂

the video show how to dynamically get a distance relative to a landmark.

// https://www.youtube.com/watch?v=dddZTpsOjY0

var click = $userinput

// step2 : get cumul from segment

var geom = Geometry($feature)

var RD = $feature.route

var densegeom = Densify(geom, 1)

var XClickGeom = intersection(densegeom,buffer(click,10,'meters'))

var PTC = PointToCoordinate(XClickGeom, click)

var POIM = round(XClickGeom.paths[PTC.partID][PTC.segmentID].m)

// step3 : get PR from cumul

var prevBorne = first(orderby(Filter(FeatureSetByName($map,"BORNES"),'G_cumul_3857_geod<=@POIM AND ROUTE=@RD'),'G_cumul_3857_geod DESC'));

if(isempty(prevBorne)){return '0 + '+ POIM}

var diff = POIM-prevBorne.G_cumul_3857_geod

var pr = prevBorne.PR + ' + ' + diff

return pr

Re: Get route m-value at point-clicked using Arcade?

NickHarvey — Thu, 16 Oct 2025 12:43:24 GMT

I'm with Katy - Thanks for posting this Joseph! So, this question/post (as titled) was about using Arcade to get the m value and this appears to work well. I am leaving all three marked solutions on the thread as valid bits of information, but yours wins 'Author's Choice'. In 2020, Xander Bakker's response was accurate, so thanks for updating this thread and for sharing your other solutions too.

Cheers,

-Nick