About Amerisurv| Contact    
Magazine | Newsletter    
Flickr Photos | Advertise    
HomeNewsNewsletterAmerisurv DirectoryJobsStoreAuthorsHistoryArchivesBlogVideosEvents
Register to receive the Amerisurv Newsletter | Also See Our LiDAR News Newsletter | RSS Feed  

Sponsored By

Software Reviews
Continuing Series
An RTN expert provides everything you need to know about network-corrected real-time GNSS observations.
Click Here to begin the series,
or view the Article PDF's Here
76-PageFlip Compilation
of the entire series
Test Yourself

Got Answers?
Test your knowledge with NCEES-level questions.
  Start HERE
Meet the Authors
Check out our fine lineup of writers. Each an expert in his or her field.
Wow Factor
Sponsored By

Product Reviews
Partner Sites







Spatial Media LLC properties




  The American Surveyor     

GPS Reveals Hurricane Wind Speeds Print E-mail
Written by Brian Clark Howard, National Geographic Magazine   
Thursday, 18 July 2013

An article in National Geographic Magazine reveals that GPS signals can be used to estimate wind speeds in a hurricane. According to Stephen Katzberg, a distinguished research associate at the NASA Langley Research Center in Hampton, Virginia, improved wind speed measurements could help meteorologists better understand and predict storms.

According to Katzberg, when GPS signals strike the surface of the ocean, about 60 percent of the signal bounces off. The more wind that pushes across water, the rougher the surface of the sea gets. Bigger, more chaotic waves break up the GPS radio waves more as they reflect off the surface. A receiver can compare that disruption to the GPS signal coming from any particular satellite, and then use software to estimate the surface wind speed based on past data and calibration.

The system works best over large expanses of water, Katzberg said. It cannot measure wind speed over land because it requires a change in the roughness of the surface, and that doesn't happen on a measurable scale as wind blows over the land. GPS can be used to measure whether something is ice or water, however, because there is a big difference between those two states of matter in terms of how they reflect signals.

But to Katzberg, even though inexpensive GPS receivers are all that are required, the holy grail would be using signals that are stronger than GPS, like those used to transmit satellite radio and television. The Sirius or XM satellite radio signal is 10,000 times more powerful than a GPS signal, he said. With stronger signals, scientists can get much better performance and resolution of what they are studying, he said.

Read more HERE 

< Prev   Next >


Amerisurv Exclusive Online-only Article ticker
Featured Amerisurv Events
List Your Event Here
contact Amerisurv


JAVAD Intros
Spoofer Buster

press [at] amerisurv.com
Online Internet Content


News Feeds

Subscribe to Amerisurv news & updates via RSS or get our Feedburn
xml feed

Need Help? See this RSS Tutorial

Historic Maps

post a job
Reach our audience of Professional land surveyors and Geo-Technology professionals with your GeoJobs career ad. Feel free to contact us if you need additional information.


Social Bookmarks

Amerisurv on Facebook 

Amerisurv LinkedIn Group 

Amerisurv Flickr Photos 

Amerisurv videos on YouTube 



The American Surveyor © All rights reserved / Privacy Statement
Spatial Media LLC
905 W 7th St #331
Frederick MD 21701
301-695-1538 - fax