Hello Cassidy --
I've replied to your comments on field enrichment of multiple attributes based on a spatial query?
If I understand the question you are asking here, you want to detect when at least two assets are within a work area and update a feature attribute which allows that area to be displayed as "cleared". For this case, I would recommend taking a look at a scenario / demo illustrated in one of our technical workshops. Here's the URL:
GeoEvent Server: Applying Real-Time Analytics - YouTube
Jump forward to minute 27:05 ... the scenario I'm fast forwarding to suggests that if you were to ingest the GPS event records from your assets and broadcast those via a stream service, you could synchronize a set of dynamic (point) geofences. You could then periodically poll the (polygon) feature service in which you were maintaining your work area features to process *those* event records separately and use a GeoTagger to detect spatial coincidence with one or more positions of tracked assets. The scenario goes on to show how you could use a Field Calculator expression to count the number of asset positions (geofences) which intersect the polled work area feature record.
I would probably recommend using a Field Mapper to strip unwanted fields from a polled work area feature record, so that I had only a asset_count attribute and a unique identifier of the work area. I would allow the GeoTagger to create a field -- which coincidentally exists as an attribute field in the work area feature records -- then use a Field Calculator to write a count of the asset identifiers found inside the area to the asset_count. You can use an add/update output to update just the assets_list and the asset_count in the feature class ... and filters to discover if there are "less than two" or "two or more" assets working the area, and update a feature overlay accordingly.
-- RJ
