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Statistics Archive Generation Help
AP Statistics can provide an abundance of statistical data. Counts, average
speeds, occupancy, median speeds and speed and length histograms for a
specified time interval can easily be created for a specified lane and access point. Statistical information can
be returned in multiple file types such as excel, comma separated value files, plots, and HTML.
Access Point ID and Time Zone
Using the pull down menu, select the Access Point of interest. Each Access Point
has a unique ID, and a short description about the installation location.
The time zone will be automatically set.
Start Time / End Time and Duration
The Start Time is required, and the Duration takes precedence over the End Time.
If any field in the End Time is left unset, the application will use the Start Time
and Duration as the time indices.
Reporting Interval
Statistical information will be computed over the specified interval.
Subtotal Interval
Counts and bin-counts will be totaled over the specific interval and a grand total will appear
at the end of the report. Occupance and speeds will be averaged.
File Type
The four currently available file types are: Excel Spreadsheet, Comma Separated Values File,
Html, and Statistical GNU plots. A user may select different file types after the initial
processing as well.
Timestamp Represents
Timestamps may represent the beginning, middle, or end of the Reporting Interval.
Report Speed Averages
At least two sensors per lane must be available to calculate ANY speed related data.
Advanced Options
Speed Edge
This option allows the user to choose what data is used for speed calculation.
Leading edge, trailing edge, or an average of leading and trailing edges can be chosen for
speed calculations.
Speed and Length Histograms
Histograms of Speed and Length can be provided with predefined bin
sizes using the pull down menu.
Diagnostic Options
When more then one sensor is installed in a lane, a combination of data from the
sensors is used for the calculation of counts, speeds, occupancy, etc. If a sensor temporarily fails
or reports inaccurate data and Diagnostic Options is enabled, the invalid data will be removed from
the statistical calculations. The Diagnostic Options printout will increment the Diag_opt field by one
for each failed sensor over the reporting interval. If the sensor fails over an interval and then
returns, it is automatically incorporated back into the system.
Reporting Filter
On - Report only vehicles that have calculable speeds and lengths.
Off - Report all vehicles regardless of available speed or length.
Valid Threshold
This value is used for filtering bad speed calculations that result from vehicle
lane changes. It sets the allowable deviation between the length calculations of the 2 sensors in a
speed pair. If the lengths deviate more than this percentage, the speed is dropped.
Adaptive Holdover
Using the entered length in feet, adaptive holdover calculates the amount of time the
count/speed/occupancy algorithms need to holdover based on the average of the last 5 speeds calculated.
Normally holdover is a time value, but adaptive holdover is a length. Time is derived from the length,
using the average speed. By default, Adaptive holdover is 10 feet.
Clock Offset
Is the number of seconds, plus or minus, that the event times will be moved before
being processed. For example, if set to 300, an event at 12am would be interpreted as an event at 12:05am.