A professional organization of global positioning experts from the petroleum industry. Site offers advice and information about GPS, geodetic datums, map projection, and other aspects of location technology.

American Society of Photogrammetry and Remote Sensing: The imaging and geospatial information society.

Professional association for the "discipline aimed at managing geographic data by means of the science and technology used to acquire, store, process, display and distribute them."

Official website with society news, information, proprietor list and meeting schedule.