Tag Archives: geodesy

xyHt Weekly News Links: 10/16/2020

How UAVs Make a Difference in Modern ForestryNew Topcon Robotic Total StationEarth Define Maps U.S. TreesNASA to Study Trees Impact on Remote SensingHxGN Content Program delivers airborne DSM to the Federal Agency for Cartography and Geodesy (BKG)Ronda Schrenk to Serve as USGIF Foundation CEO

Dr. Gladys B. West

Dr. Gladys B. West: The Autobiography of a GPS Pioneer

The inspiring and touching memoir of a pioneering mathematician, Dr. Gladys B. West, who has been recognized and honored for her key contributions to the development of GPS. Gladys Mae Brown Recently published, “It Began with a Dream” chronicles an extraordinary life and is a celebration of perseverance, hard work, faith, and family. Authored by...

GEOID18: Make Your Mark and Improve Your Heights

As a community, we have the unique opportunity to contribute to the densification and improvement of our national geoid model and vertical transformation tools in support of the ongoing modernization of the National Spatial Reference System (NSRS). While the geoid model is a national level product, the impacts of this work are directly felt within...

xyht 2022

2022: Monumental Changes, Part 1

The National Geodetic Survey of the U.S. responds to surveyors’ questions on how legacy physical geodetic monuments will be affected by the planned 2022 reference framework modernization. Editor’s note: A recent article in xyHt’s online newsletter, Field Notes, prompted a discussion among surveyors on the pending 2022 modernization of the National Spatial Reference System (NSRS) for...

xyHt August

xyHt Magazine August 2017 Issue

To view this issue as it appears in full in print, click the cover: Below are featured articles from the issue on our website: Editorial Fire, Ice, and Latitude in Ecuador Nicholls State University Geomatics Program Photogrammetric Engineering at The National Polytechnic Institute Drones and Surveying Flood Zones Controlling the Future with Training Women in...

Equations 1-5, Charles Ghiliani, Error Ellipses, xyHt July 2017

Error Ellipses

Part 2: Components and Increasing Probability In the previous article (April 2017) I discuss the correlation of the coordinate values for a station and how an error ellipse is used to determine the direction of the largest error at a station. In this article I review the components of an error ellipse, the process that...