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create point from center of line using arcade

NathanMcKinley3

Does anyone know if you can create point symbology from the center coordinate of a line feature using arcade?

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Bud

I'm not sure if this will be helpful or not, but I'll post it anyway:

In similar situations where we don't have a Midpoint() function, such as in the St_Geometry spatial type in EGDBs, we've used the following hack:

Buffer the line and get the centroid of the resulting polygon. It's kind of like a "poor man's midpoint".

If I recall, that works ok. But I think I remember the point not being the exact midpoint of the line. I forget what the specific issue was. It's probably good enough for most use cases though...

XanderBakker

Hi @Amanda__Huber ,

So in the symbology profile, Arcade could return a geometry, but this is not something that is valid and that can be used to draw those features. Can you elaborate a bit more on what you have and what you want to get (and explain the why in this a bit more)?

Amanda.Huber@threeriversparks.org_trpd

@XanderBakker,

In theory, if you use feature sets with this workflow could you use arcade on a separate point layer to represent the centroid of this line layer?

We're looking to do the same thing, but curious on your thoughts as we get started.

Thanks!

XanderBakker

I don't think you can use Arcade to visualize polylines as points. The error message seems to refer to the spatial reference. I did a simple test on a hosted feature that I published using the same spatial reference as the base map and it returned the point:

var geom = Geometry($feature);
Console('\ngeom:' + geom);

var line = Polyline(geom);
Console('\nline:' + line);

var cent = Centroid(line);
Console('\ncent:' + cent);

var pnt = Point(cent);
Console('\npnt:' + pnt);‍‍‍‍‍‍‍‍‍‍‍

return pnt;<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

Which yields:

geom:{"paths":[[[-8414259.482734734,697445.4680427602],[-8414258.288406167,697445.4680427602],[-8414258.288406167,697457.4113284288]]],"spatialReference":{"wkid":102100,"latestWkid":3857}}

line:{"paths":[[[-8414259.482734734,697445.4680427602],[-8414258.288406167,697445.4680427602],[-8414258.288406167,697457.4113284288]]],"spatialReference":{"wkid":102100,"latestWkid":3857}}

cent:{"x":-8414259.482734734,"y":697445.4680427602,"spatialReference":{"wkid":102100,"latestWkid":3857}}

pnt:{"x":-8414259.482734734,"y":697445.4680427602,"spatialReference":{"wkid":102100,"latestWkid":3857}}
<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

So it returns the point, but the symbology will no be what you want (they will remain lines, and you will have an object for your symbology that you cannot actually use):

DanielHuneycutt

I'm currently working on this for polygon features.

Using:

POINT (Centroid(Geometry($feature)))<SPAN class="line-numbers-rows"><SPAN>‍</SPAN></SPAN>

But getting this error:

Execution Error:Cannot create Geometry in this SpatialReference. Engine is using a different spatial reference.<SPAN class="line-numbers-rows"><SPAN>‍</SPAN></SPAN>

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