DCESZonalCache

Description: Describes attributes of Scaled Grid Zonal Caches (which store average travel time between zones based on street routing). Used by DCES as an alternate method for estimating distance and travel times. Not exclusive to PASS.

Field	Documentation
ZonalCacheId	Unique identifier of a Scaled Grid Zonal Cache.
recordStatus	Status of the record (A = active, D = deleted, N = under construction).
Created	When this comment was created.
EffectiveDate	Travel date used for computing the averages for this cache.
WeeklyTemplate	Indicates which days of the week the cache is applicable to
ValidityCRC	Internal use only (Checksum value).
DistanceMethod	Hard-coded value for the type of calculation used to generate the data (e.g., Triangulation or Direct Distance).
MapOriginLon	Map origin point (longitude) to which the MapCoverage fields apply. Used with MapOriginLat.
MapOriginLat	Map origin point (latitude) to which the MapCoverage fields apply. Used with MapOriginLon.
MapCoverageTop	Map region covered by this zonal cache as meters above the map origin point.
MapCoverageLeft	Map region covered by this zonal cache as meters to the left of the map origin point.
MapCoverageBottom	Map region covered by this zonal cache as meters below the map origin point.
MapCoverageRight	Map region covered by this zonal cache as meters to the right of map origin point.
BaseZoneSize	Width of zone for base grid in meters.
MaxExtent	Maximum number of zones away from the origin zone for which this cache will contain distance and travel times in any given cache grid.
MaxZoneSize	Maximum width of a zone in the grid with the largest zones. Creates an upper limit for the number of scaled grids.
TimePeriods	Number of time periods a day is divided into (starting at 0:00, ending at 24:00)
NumGrids	Number of grids used by this ZonalCacheId.
ComputePoints	Number of points used in each zone for computing average travel times to other zones in the grid.
ComputeReverse	Defines which travel times are used in calculations (1 = zonal cache includes travel times based on specified arrive times, 2 = zonal cache only include travel times based on specific departure times).
VarTimePeriods	Variable size time periods as a CSV list of start times.