Survey Scene

RTK on a Smartphone Running AutoCAD: I Did It Last Week

April 10, 2014By
20140327_161552

Last week was spring break (for high school and college) for my kids. We decided to drive to San Francisco and the surrounding area to do a little sightseeing. It’s a beautiful place. This is a view from our 3rd floor room in the hotel, looking over the bay. Here’s a view from the Marin Headlands overlooking San Francisco Bay and... read more

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Do You Know OPUS Can Do This?

March 7, 2014By
GNSS Choke-ring antenna used

I recently was involved in a project outside of the United States. Part of the project involved setting up a couple of RTK base stations. Of course, I wanted the antenna surveyed with reasonable accuracy with respect to ITRF. Even though supporting OPUS outside of the U.S. is out of the scope of the NGS mission (I assume), it works... read more

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Centimeter-Level RTK Accuracy More and More Available — for Less and Less

February 4, 2014By
Eric Gakstatter

Last month, I started off 2014 with a bang by listing all the public RTK bases available in the United States, most of them being free. I received a lot of positive feedback and some enlightenment. For example, I didn’t know that in California, there are more than 330 RTK public base stations accessible by anyone for free via the... read more

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Finally, A List of Public RTK Base Stations in the U.S.

January 7, 2014By

First of all, let me wish a Happy New Year to all my friends around the world and a prosperous 2014. I’m as excited as I’ve ever been about GNSS technology. If I may ask for forgiveness from you if you live outside of the United States, I’d like to start out answering a question I’ve been asked about for... read more

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Reflecting on 2013, from Your Perspective

December 5, 2013By

As the end of the year approaches, I'd like to reflect on 2013. One of the new features of the GPS World website allows me to access webpage statistics so I can understand which articles and news items were “hot.” Following is a list of GPS World magazine's hot topics for 2013 with some commentary from me. read more

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Drone Moans and Satellite Woes

November 14, 2013By

As some of you may know, I also write a monthly column for Geospatial Solutions, which is all about geospatial technology encompassing GIS, surveying, engineering, and anything regarding geospatial technology. On occasion, I write something that fits very well with both my Survey Scene newletter and Geospatial Solutions Monthly newsletter. This is one of those months. Drones, UAVs, UAS…whatever you... read more

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Seven Free Alternatives to OPUS GPS Post-Processing During U.S. Federal Government Shutdown

October 2, 2013By
NGSShutdownScreen-250

On October 1, 2013, the U.S. federal government shut down and furloughed 800,000 non-essential workers. While services considered essential remained active, those considered non-essential services, like the National Geodetic Survey’s Online Positioning User Service (OPUS), were shutdown. OPUS is a free, online GPS post-processing service. If you try to access www.ngs.noaa.gov, the following screen will be displayed: For those of... read more

Letters to the Editor

October 1, 2013By
Constellation snapshot for a specific date/time: GPS week 1749 (725) and GPS seconds 86400 = July 15, 2013, at midnight GPS Time.

Orbital Planes, Nightmares, Pioneers Good morning, Dr. Langley, I have a seven-year-old drawing of GPS satellites in their orbital planes that I found (can’t recall where) some years ago, either on a website or from a colleague who attended some GPS forum. Would you know of a site where I can find current information on GPS satellite locations, which ones... read more

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