Webinar Wednesday - What is the Effect of the Number of Ground Control Points on the Accuracy of sUAS Surveys?

  • 21 Nov 2018
  • 12:00 PM - 1:00 PM
  • Online


  • Member of PSLS
  • Not a member of PSLS
  • Member of a professional organization in the Geospatial industry such as NSPS, PSPE, PCPG, etc. Contact bpollihan@wannerassoc.com for code.


Wednesday Webinar 

What is the Effect of the Number of Ground Control Points on the Accuracy of sUAS Surveys?

Presented by: Dimitrios Bolkas, PhD, PEng

Date: November 21, 2018

Time: 12:00 PM


  • PSLS Members: $40
  • Non-Members: $60
  • Member of  Other  Professional Organization: $40

CE Credits: 1 PDH

Course Description:

Ground control points (GCPs) are important in surveys conducted using small unmanned aerial systems (sUAS), as they are used for geo-referencing of captured images and camera self-calibration. However, the geo-referencing and self-calibration accuracy, and consequently the accuracy of derived point-clouds, can vary based on the number and location of GCPs. In addition, some sUASs carry survey-grade GNSS units, which aids the geo-referencing process. This webinar will demonstrate how the number of GCPs can affect the accuracy of sUAS point-clouds and provide guidelines for practitioners. Two cases will be examined, namely: (a) sUAS surveys that rely solely on GCPs, and (b) sUAS surveys that utilize survey-grade GNSS positioning. This webinar uses data collected at the Pennsylvania State University, Wilkes-Barre campus, which are compared with reference elevations derived from terrestrial laser scanning. 


Dimitrios Bolkas, Ph.D., is currently an Assistant Professor of Surveying Engineering at the Pennsylvania State University, Wilkes-Barre Campus. He is experienced with several 3D data-acquisition methods such as terrestrial, mobile, and airborne laser scanning, small unmanned aerial systems, and GNSS. In addition, he has experience with digital elevation models, geoid and gravity-field modeling. His main research interests include the quality assessment and refinement of 3D spatial data and models, as well as the exploration of the synergies that exist in them. His work has appeared in several peer-reviewed academic journals and presented in various national and international scientific meetings. Furthermore, he has been a professional engineer in Greece since 2011. 

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 membership. Please email Barb Pollihan at bpollihan@wannerassoc.com or call 717-441-6057, ext. 130.

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