Changes between Version 16 and Version 17 of TrafficModelATMSOverview

Timestamp:

02/26/2019 05:37:40 PM (7 years ago)

Author:

jdalbey

Comment:

Update "Station" to be VDS.

TrafficModelATMSOverview

@@ -74 +74 @@
 
 ==== Traffic Model Classes ==== #trafficmodelclasses
-The Highways and Highway classes were developed to give developers an abstraction of the traffic network that was feasible to work with. A Highway is undirected, meaning it does not have an associated (N/S/W/E) direction and represents traffic in both directions on the highway. A Highway is an aggregation of all of the Stations on a highway, sorted by postmile value. Stations do have an associated direction. Stations may or may not have Loop Detectors associated with the specified station direction, or the opposite specified direction. Hence, the undirected Highway abstraction.  Diagram: [attachment:PeMS_data_sources.png PeMS data sources].
+The Highways and Highway classes were developed to give developers an abstraction of the traffic network that was feasible to work with. A Highway is undirected, meaning it does not have an associated (N/S/W/E) direction and represents traffic in both directions on the highway. A Highway is an aggregation of all of the Stations on a highway, sorted by postmile value. Stations do have an associated direction. Stations may or may not have Loop Detectors associated with the specified station direction, or the opposite specified direction. Hence, the undirected Highway abstraction. 
+
+''Update: ''As of r280 on Feb 26, 2019, "Station" now represents a Vehicle Detection Station, which is a logical grouping of all loop detectors for one direction.  So it DOES have an associated direction and all the loop detectors it monitors are going that direction.  Please refer to this diagram: [attachment:PeMS_data_sources.png PeMS data sources].
 
 The Highways, Highway, and Station classes are all immutable. None of them contain dynamic data. The only class in the Highways model that contains dynamic values is the !LoopDetector class. The dynamic values in the !LoopDetector class are volume and occupancy. The volume field is an int, and the occupancy field is a float in the [0,1] range. The DOTCOLOR enum (specified in the !LoopDetector class) represents the colors shown on the ATMS Client (!Green/Yellow/Red). This enum supplies the necessary volume and occupancy values to achieve the desired display color for a Loop Detector.