ED GARVIN The rapid growth of interest in such websites as Google Earth and Virtual Earth has been an overall benefit to the spatial industry. However, there has been much discussion regarding the use of the spatial information from these websites. It is centred around the value that they add, the value that they imply […]
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The Future of GNSS
WILLIAM GIBBS At least one possible future for the delivery of high-accuracy services from global navigation satellite systems is becoming clearer as time passes. A large number of networks will be available. They will be operated by private enterprise. Surveyors and others in need of centimetre-level positioning have much to look forward to, although it […]
Satellite-Based Augmentation Systems
ROBERT LORIMER America has the wide area augmentation system (WAAS), Europe the European GNSS overlay system (EGNOS), Japan the multifunction satellite augmentation system (MSAS) and India is launching its GPS-aided Geo-augmented navigation (GAGAN) system. They are all satellite-based augmentation systems (SBAS) and are already delivering improved accuracy and integrity for GPS users over much of […]
Mapping the Sydney Underground
JON FAIRALL Tough new penalties await contractors who interrupt electricity and gas supplies in Sydney. The legislation, which allows for five-year jail terms, has passed through the New South Wales Parliament and is now awaiting Royal Assent. It follows a series of power failures in Sydney’s central business district in March. The legislation is a […]
