One of the goals of geodesy is to determine the distance between the geoid and the ellipsoid for GPS use. The need for a more accurate geoid is expressed in the Ten-year Plan of the National Geodetic Survey (NOAA 2008). The plan predicts that a 1-cm geoid is achievable and will be used by 2018 (NOAA 2008). The specific equation that greatly aids in defining the geoid is Stokes' formula which utilizes worldwide gravity data to predict the geoid surface.
SaLIS is a scientific journal devoted to reporting research and new work conducted to advance geodetic surveying, land surveying, large-scale mapping, and geographic information systems designed to advance the development and management of the cadastral parcel data layer and other land information applications. SaLIS publishes research articles, technical papers, technical notes, papers on the current state of surveying education, surveying history, book reviews, and current literature reviews. Every four years, the journal publishes the U.S. Report to the International Federation of Surveyors (FIG). The Proceedings of the Surveying Teachers Conference are published bi-annually.