Mapping the Underworld: Testing GPS and GSM in Urban Canyons Mar 1, 2007 By: Jean-Philippe Montillet, Ahmad Taha, Xiaolin Meng, Gethin W. Roberts

Beneath the streets lie thousands of kilometers of cables and pipes. Buried decades ago, their exact location remains a mystery. At the University of Nottingham, researchers tested GPS and a system that pairs GPS with Global System for Mobile Communication (GSM) algorithms. Their goal: find a solution for mapping buried assets, which in turn will increase the efficiency of streetworks projects.

Drive-By DTM GPS and GSM Power Cost-Effective Terrain Modeling Apr 1, 2006 By: Adam Ciecko, Bartlomiej Oszczak, Stanislaw Oszczak

A data teletransmission system for quick and efficient creation of digital terrain models (DTMs) forms the backbone of experimental work in the transmission of differential GPS and real-time kinematic (RTK) corrections. A roving vehicle carries the system and collects data for a precise DTM.

Hurricane Hunters GPS Dropsondes Trace Katrina's Course Oct 1, 2005 By: Marty Whitford

GPS dropsondes released into the Katrina's eyewall tracked and predicted wind strength, speed, and direction.

Time-Invariant Sea-Floor Depths Using the Ellipsoid As Zero-Reference Surface Sep 1, 2005 By: Muneendra Kumar, George A. Maul

A GPS survey combined with acoustic soundings can determine highly accurate sea-floor depths. Using the ellipsoid as the zero-reference surface then allows navigators, while underway, to determine both keel and overhead obstruction clearance independent of the stage of the tide and the draft of the ship and freeboard.