Is It Possible to Utilize Velocity to Detect Attribute Change/Edit?

ArmstKP

I was wondering if it is possible to utilize ArcGIS Velocity to detect an attribute change/edit, to trigger another action, like sending a text message or email?  Has anybody done this?

JeffEismanGIS

@ArmstKP  yes it is possible to detect a attribute change in real time. One way to do this is to use Track functions - TrackFieldWindow

https://developers.arcgis.com/arcade/function-reference/track_functions/#trackfieldwindow

Track Functions can be use in the Calculate Field and Map Field tool arcade expressions:

Here is a sample workflow using a simple AVL feed tracking snow plows with a driver name attribute that could change as time passes.

 

 

Using DriverName and the TrackFieldWindow to send a notification when the change is detected.

 

 

TrackFieldWindow ( fieldName , startIndex , endIndex )

fieldName = driverName accessed as 'driverName'

startIndex = Past Feature (-1) accessed using TrackFieldWindow(-1,0)[0]

endIndex = Current Feature (0) accessed using $feature.driverName

 

// Get the prior observation value for the field using TrackFieldWindow
var priorValueArray = TrackFieldWindow('driverName', -1, 0)[0];

// Get the current feature observation value for the currentValue field
var currentValue = $feature.driverName;

// Handle the case where the first value does not have a prior feature
// If there is a prior value, determine if the value changed
if(count(priorValueArray) < 1){
return false;
} else {
return IIf(priorValueArray[0] != currentValue, true, false);
}

 

Then if the past feature and current feature are the same it returns - False

If past feature and current feature are different is returns - True   indicating a attribute change.

 

 

 

Once you have that set you can leverage the filter tool to detect that change the send out a notification.

This is just one example but this workflow can be modified to reflect other use cases