Abstract: A system and method is disclosed for updating the universal time within a GPS enable device in real-time and utilizing that corrected time to improve upon pseudorange calculations in the GPS devices. A time shim is introduced to correct outlier time values and provide improved pseudorange calculations to the device operating system, as well as draw upon various predictive smoothing methods of timestamp and position data to improve GPS location values. The improved GPS data is then provided to a location services process running on the device in an expected format and timing such that the operating system is unaware that the prior application interface of the system has been circumvented.

Abstract: The current invention is a system and method for certifying GPS locations on a land tract using consumer devices having standard GPS chipsets. The system takes a plurality of readings from at least four satellites into one or more sample sets. A smoothing function is used to remove outlier GPS values and a circular plot of spatial positions made. A center location of the plot is then calculated and recorded. The process is repeated and then compared to the first center calculation. If the difference is less than a predetermined certification value, the position can be certified as accurate. Various features in a land tract can be certified to the predetermined accuracy. For example, using the process to certify or correct errors in a shapefile representing the land tract, physical markers placed on the land tract, or environmental features of a land tract to lessen environmental impact during development.