Date of Graduation
7-2021
Document Type
Thesis
Degree Name
Master of Science in Geography (MS)
Degree Level
Graduate
Department
Geosciences
Advisor/Mentor
Tullis, Jason A.
Committee Member
Limp, Fredrick W. Jr.
Second Committee Member
Shaw, John
Keywords
Contour maps; Drone mapping; Drones; Geodesy; Geography; Geolocation
Abstract
Groundwater monitoring wells are commonly installed on a property as part of an environmental investigation to observe hydrological subsurface conditions, facilitate the collection of groundwater samples, and predict the flow of groundwater across a site. In addition to their installation, monitoring wells should be surveyed or mapped as accurately as possible. Traditional surveying techniques have employed the use of global navigation satellite systems (GNSS) technologies or other surveying equipment. A common surveying approach is to use real-time kinematic (RTK) GNSS to accurately measure the coordinates of each monitoring well on the site.In recent years, drones, or small unmanned aircraft systems (sUAS), have been used in geographic mapping as an alternative to traditional ground surveying. In this study, five mock monitoring wells were surveyed/geolocated using RTK GNSS. In addition, these wells were mapped using sUAS and commercial photogrammetric image processing software. This study compared the accuracy of monitoring well coordinates obtained from sUAS mapping techniques to well coordinates collected via traditional RTK GNSS equipment. The most accurate monitoring well coordinates were obtained from a single grid, 20 degrees off-nadir, flight pattern. The differences between this flight and RTK GNSS measurements was, on average, approximately 7.9 centimeters (cm) for horizontal (northing and easting) and approximately 4.8 cm for vertical (orthometric height). While not as accurate as coordinate measurements collected with RTK GNSS, data obtained from sUAS mapping techniques was accurate enough to geolocate monitoring wells for the construction of useful and meaningful topographic and groundwater contour maps. Future work may include the comparison of data collected using RTK sUAS (drones carrying an onboard GNSS RTK receiver) without ground control points (GCPs) to data collected by the methods discussed in this study.
Citation
DeYoung, J. (2021). Geolocation of Monitoring Wells Using Small Unmanned Aircraft Systems. Graduate Theses and Dissertations Retrieved from https://scholarworks.uark.edu/etd/4141
Included in
Geographic Information Sciences Commons, Hydrology Commons, Nature and Society Relations Commons, Physical and Environmental Geography Commons, Remote Sensing Commons