PSLS Webinars

PSLS has scheduled live webinars for the third Wednesday of each month at noon. Sessions last one hour unless noted otherwise and many offer one Professional Development Hour. Check back for updates and to register for the latest webinar. 

Members of professional organizations in the geospatial or related fields (NSPS, AAGS, GLIS, PSPE) may receive a discount equal to the PSLS member discount. Please contact PSLS at 717-540-6811.

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Webinar Wednesday: Geodetic Reference Frames Supporting GPS

Presented by: Dave Doyle

Date: July 15, 2015

Time: 12:00 PM


  • PSLS Members: $35
  • Non-Members: $50
  • Member of  Other  Professional Organization: $35

CE Credits: 1 PDH


Description: While use of the Global Positioning System (GPS) has revolutionized everyone’s professional and personal positioning capability there is still considerable confusion about the understanding and relationship of the several geodetic coordinate systems involved.  How does the national geometric coordinate system of the United States, the North American Datum of 1983 (NAD 83) related to the default system used by GPS, the World Geodetic System 1984 (WGS 84)? How do both of these relate to the international positioning standard called the International Terrestrial Reference Frame (ITRF)?  Are they the same or are they different and if so by how much and how do we get from one to the other?  This presentation will attempt to highlight the definitions of these systems, their differences and how coordinates should be expressed in professional use and a tool that can be used to transform between them.  

Presenter: Dave Doyle joined the National Geodetic Survey in 1972, and held the position of chief geodetic surveyor for twelve years prior to his retirement in January 2013. He was responsible for the development, technical design and management of plans and programs that enhanced the United States National Spatial Reference System. During his career with NGS his experiences included all phases of geodetic triangulation, astronomic positioning, leveling, GPS data collection, data analysis, datum transformations, network adjustments, data publication and outreach in the form of seminars, workshops and webinars. His efforts also included extensive activities to direct and coordinate the modernization of national geodetic reference frames in countries in Africa, Central, Caribbean and South America, Eastern Europe and the Pacific.

Mr. Doyle is a Past President of the American Association for Geodetic Surveying, a Fellow member of the American Congress on Surveying and Mapping, and has served on the U.S. delegation to the International Federation of Surveyors.

Note: Members of other Professional societies such as PSPE, NSPS, ACSM, or other state surveying societies may register at the discounted price. In order to receive the necessary code, registrants must contact PSLS with proof of members

Future Webinars

August 19, 2015 - Low Impact Development
Presented by Paul DeBarry

September 16, 2015 - Precise Point Positioning
Presented by Ryan White

  2015 Webinar Sponsor

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