Common use of GPS Data Clause in Contracts

GPS Data. GPS data were logged by the GeoStats In-Vehicle GeoLoggerTM system installed on transit coaches. GeoLogger can track up to 12 satellites and update data every second, with a position accuracy of 15 meters in root-mean-square (RMS). Thirteen GeoLoggers were installed on the test coaches. All the GeoLoggers were preset to record data every second when the vehicle speed exceeded 1.15 miles per hour. The following is an example of logged GPS data: The first field showed the working status of GPS. If the status was okay, the GeoLogger recorded an “A.” The next four fields were the coordinates of vehicle position shown in longitude and latitude. The fifth field showed time in the “hhmmss” format. The sixth field represented the date in the “ddmmyy” format. The seventh filed was the speed in miles per hour. The eighth field was the heading of the vehicle in degrees. The last two fields related to the satellite signal quality, showing Horizontal Dilution of Precision (HDOP) and number of satellites, respectively. To analyze position data more conveniently, we wrote a piece of MATLABTM code to transfer the positions from the longitude and latitude coordinate system into the ▇▇▇▇▇▇ coordinate system, defined for North American Datum (NAD) 1927 State Plane Washington North FIPS 4601.