Survey Scene

Survey Perspectives – August 2007

August 28, 2007By

I, along with John Flick, co-authored a fairly in-depth piece on GNSS in the April 2006 issue of Geospatial Solutions. The basics of that article are still applicable, but here´s an update on GNSS events that have transpired since then ? with a bit of speculation and guesstimation thrown in. read more

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Survey Perspectives – September 2007

August 28, 2007By

I thought this would be a timely subject, since I´m heading off for two days of CGSIC/NAVCEN presentations before the ION GNSS 2007 conference starts on September 25. I´ll also be staying for the conference, and reporting back to you on what I hear there. read more

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Survey Perspectives – July 2007

July 30, 2007By

The European Geostationary Navigation Overlay Service (EGNOS) is Europe´s version of the U.S. Wide Area Augmentation System (WAAS) with essentially the same mission. It offers GPS users in Europe more accurate and reliably GPS positioning. Like WAAS, EGNOS focuses on improving the integrity and accuracy of autonomous GPS positioning primarily by modeling refraction caused by the ionosphere. Also, EGNOS was designed to be compatible with WAAS so your WAAS-enabled receiver will work with EGNOS just fine. read more

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Survey Perspectives – June 2007

June 27, 2007By

It´s been about a year since I´ve touched on WAAS (Wide Area Augmentation System) with any depth, and a lot of things are happening on that front so I´d thought I&acite;d give an update. Also, look for a column on EGNOS (Europe´s version of WAAS) in the next month or two. read more

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Survey Perspectives – May 2007

May 17, 2007By

Whether you live in London, Lagos, Lisbon, or Los Angeles, when you are looking to buy a survey instrument, most likely you have a preferred instrument distributor in mind. Maybe it´s the local Topcon dealer. Perhaps your Leica dealer has served you well. Or you might prefer the Trimble dealer in your area. All of the manufacturers have distributors signed up around the world. Some operate on a regional basis, serving several countries, while others serve one specific country. I raise this point because of recent, significant changes in the U.S. distribution of survey instruments. read more

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Survey Perspectives – April 2007

April 19, 2007By

Ok, this column is supposed to be about high-precision GNSS, right? Well, who would have ever thought I?d be inclined to write about consumer GPS receivers? Certainly not me. Sometimes, I even speak rather condescendingly about those Wal-Mart GPS units because they seem to be mis-used so often in the survey/construction business read more

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DIRECTIONS 2007: Survey & Construction

December 1, 2006By

While 2006 saw two IIR-M satellite launches, look for double that in 2007. Even if new launches don?t improve the PDOP spikes, we?ll have more reliable hardware in orbit. The Big Mo is rolling. read more

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Expert Advice – Managing the GPS Constellation for Today’s Needs

September 1, 2006By

For many, GPS is at its best performance ever, with 29 satellites in orbit and user range errors at their lowest levels in years. Yet for others, GPS performance falls short of expectations. read more

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