Stops4POIProcess Description

This process computes the stops around a point of interest (POI) within a certain radius around the point. Tracks with stops are simply identified by a maximum speed threshold value.

Algorithm Description

The different steps are as follows:

• buffer is computed around POI
• track measurements are queried for buffer
• iterate over measurements:
  • check, if trackID is already stored in tracksWithStop list; if yes, go to next measurement, if no:
    • if measurement.speed<maxSpeed, store trackID
• total number of stops is length of tracksWithStop list, total number of tracks is length of list of all track IDs

Process Parameters

Identifier

org.envirocar.wps.Stops4POIProcess

Inputs

• pointOfInterest
  • Type: WKT
  • Description: Point of interest
• maxSpeed
  • Type: Double
  • Description: maximum speed value to consider a measured speed value as a stop
• bufferSize:
  • Type: Double
  • Description: size of buffer that is created around POI to determine nearby tracks
• temporalFilter (TODO):
  • Type: String; formatted according to description of EnviroCar server
  • Description: temporal filter; can be used to specify temporal window for which stops should be computed

Outputs

• pointOfInterest:
  • Type: GeoJSON
  • Description: GeoJSON feature that contains the POI geometry as well as total number of stops, the total number of tracks and the percentage of stops.