All posts by Dave Doyle

The Shutdown and Geodetic Services

Editor’s Note:  We find ourselves in another government shutdown that has affected services from the National Geodetic Survey (NGS)—like the automated online post-processing user system (OPUS) that surveyors have become increasingly reliant on. Several readers asked us to re-post the following from the retired NGS chief geodetic surveyor Dave Doyle, as relevant as it was...

Fundamentals of Geodesy

Part 1: An Introduction Editor’s note: With this article we start an overview of GeoLearn courses offered by Dave Doyle, former chief geodetic surveyor for the National Geodetic Survey and geodesy editor of xyHt.  GeoLearn (geo-learn.com) is an online education business helping professionals reach mandatory continuing education requirements and sort through everyday work issues. Dave’s...

The deputy director told xyHt that NGA wanted to have a bigger role.

NGA’s Involvement With Our World

Above: The deputy director says that NGA wants to have a bigger role. Editor’s Note: On July 23, xyHt editors Gavin Schrock and Dave Doyle were invited to address an audience of professionals at the headquarters of the federal government’s National Geospatial-Intelligence Agency (NGA) in Springfield, Virginia. While this was a closed-door session held to...

Discussion of Senate Bill 804, SB 804

Editor’s Desk: Silent Sea Changes Two events in the past month are possibly among the most important things to happen to this community in a long time.  Both have come almost unnoticed.   On Friday, March 22, I learned that the governor of Virginia was on the verge of signing Senate Bill 804, SB 804...

Surveyors and Surveying: Fit for Purpose

“Fit for purpose” is a phrase I’m hearing about with increasing frequency. I’d strongly suggest that you, my fellow surveyors, begin to pay attention to it. Here’s why.In the May issue I wrote about a recent situation that occurred in Virginia where two counties had decided to define their common boundary through a “GIS map”...

Feature: A New Datum

Finally: the rationale for a new geometric geodetic reference frame to replace the North American Datum of 1983. In 2008, the NGS released the publication of a ten-year operating plan that, among other things, called for efforts to replace NAD 83 and NAVD 88, the official horizontal and vertical geodetic datums of the United States.  (Note...