Mapping 

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Articles

Mapping the Underworld: Testing GPS and GSM in Urban Canyons

 Mapping the Underworld: Testing GPS and GSM in...

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.

2007-03-01
Drive-By DTM

 Drive-By DTM

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.

2006-04-01
Hurricane Hunters

 Hurricane Hunters

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

2005-10-01
Time-Invariant Sea-Floor Depths

 Time-Invariant Sea-Floor Depths

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.

2005-09-01