TAG: Survey Scene

More, More, More. Accuracy, Accuracy, Accuracy.

September 2, 2015By
How accurate is good enough for the majority of this sector?

Reliable, consistent positioning accuracy has always driven new product development in the survey and mapping sector of the GPS/GNSS market. It’s remarkable how quickly the provided accuracy in successive new survey products over the years has increased the required accuracy from users and customers in the field, and consequently the desired accuracy in a feedback loop to the product developers.... read more

Establishing Orthometric Heights Using GNSS — Part 2

August 5, 2015By
Figure 2. NAD 83 (2011) Network Design for Stations EA0873 and EA0875. [Note: GNSS Vectors for GNSS projects GPS 1588 and GPS 2057 were provided by NGS].

GNSS-derived ellipsoid heights are the basis for GNSS-derived orthometric heights, so it makes sense to make these ellipsoid heights as close to error free as possible. This article will discuss guidelines for detecting, reducing andr eliminating error sources in ellipsoid heights. It will focus on guidelines for establishing accurate ellipsoid heights in a local geodetic network. (Part 2 of a series) read more

Establishing Orthometric Heights Using GNSS — Part 1

June 3, 2015By
David B. Zilkoski

Editor’s Note: This month, we introduce a column by David B. Zilkoski, one of our two new Survey Scene editors. Zilkoski has worked in the fields of geodesy and surveying for more than 40 years, including serving as director of the National Geodetic Survey. See his full bio at the end of this article. He is joined by coeditor David Doyle, who contributed the May column. The Three Types of... read more

Down in the Flood with GPS

March 31, 2015By

Surveyors, prepare to get your feet wet. Global warming is about to hit you in the job list. By 2050, a majority of U.S. coastal areas are likely to be threatened by 30 or more days of flooding each year. This according to a December report in Earth's Future, a journal of the American Geophysical Union. read more

What Exactly Is GPS NMEA Data?

February 4, 2015By

You may have heard about “NMEA data” with respect to GPS. NMEA existed well before GPS was invented, and today is a standard supported by all GPS manufacturers. NMEA gives equipment users the ability to mix and match hardware and software, and makes it easier for software developers to write software for a wide variety of GPS receivers. What makes NMEA confusing is that there are quite a few NMEA messages, not just one. This month, I break down the mysterious NMEA code. read more

This article is tagged with , and posted in Opinions, Survey

GNSS: The New GPS

January 7, 2015By
BDS coverage area

First of all, on behalf of all of us here at GPS World magazine, allow me to welcome you to 2015. We wish you a healthy and prosperous new year! I’d like to start out the new year stating the obvious for some of you, maybe most of you…perhaps all of you: GNSS is the new GPS. In the high-precision... read more

This article is tagged with and posted in Opinions, Survey

What Happened to Piksi, the $995 RTK GNSS Receiver on Kickstarter?

December 3, 2014By
Piksi

A little more than a year ago, Swift Navigation started a Kickstarter campaign for a $995 RTK GNSS receiver named Piksi. The goal was to raise $14,000 for the project. By the time the Kickstarter campaign was ended, Swift raised $166,097 from 303 backers. I wrote an article about the Swift’s Kickstarter campaign in September 2013, a few days before... read more

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