Abstract
The National Park Service (NPS) Submerged Resources Center (SRC) documented the East Key Construction Wreck in Dry Tortugas National Park using Structure from Motion photogrammetry, traditional archaeological hand mapping, and real time kinematic GPS (Global Positioning System) survey to test the accuracy of and establish a baseline “worst case scenario” for 3D models created with NPS SRC’s tri-camera photogrammetry system, SeaArray. The data sets were compared using statistical analysis to determine accuracy and precision. Additionally, the team evaluated the amount of time and resources necessary to produce an acceptably accurate photogrammetry model that can be used for a variety of archaeological functions, including site monitoring and interpretation. Through statistical analysis, the team determined that, in the worst case scenario, in its current iteration, photogrammetry models created with SeaArray have a margin of error of 5.29 cm at a site over 84 m in length and 65 m in width. This paper discusses the design of the survey, acquisition and processing of data, analysis, issues encountered, and plans to improve the accuracy of the SeaArray photogrammetry system.
Highlights
In recent years, the use of photogrammetry to record submerged archaeological sites has developed into a standard documentation tool [1,2,3,4,5,6,7,8,9,10,11,12,13]
National Park Service (NPS) Submerged Resources Center (SRC) documented the East Key Construction Wreck in Dry Tortugas National Park using Structure from Motion (SfM) photogrammetry, traditional hand mapping, and Real Time Kinematic (RTK) survey to test and establish a baseline “worst case scenario” of accuracy for 3D models created with SeaArray, as well as to evaluate the amount of time and resources necessary to capture an acceptably accurate photogrammetry model of a submerged archaeological site
This study sought to determine the accuracy of 3D models created with the SeaArray platform by comparing measurements from an uncalibrated “worst case scenario” configuration to those derived from a state of the art RTK GPS survey of the same site, as well as to evaluate the amount of time and resources necessary to capture an acceptably accurate photogrammetry model of a submerged archaeological site
Summary
The use of photogrammetry to record submerged archaeological sites has developed into a standard documentation tool [1,2,3,4,5,6,7,8,9,10,11,12,13]. NPS SRC documented the East Key Construction Wreck in Dry Tortugas National Park using Structure from Motion (SfM) photogrammetry, traditional hand mapping, and Real Time Kinematic (RTK) survey to test and establish a baseline “worst case scenario” of accuracy for 3D models created with SeaArray, as well as to evaluate the amount of time and resources necessary to capture an acceptably accurate photogrammetry model of a submerged archaeological site. AA bbaassee ssttaattiioonn aanntteennnnaa//rreecceeiivveerr wwaass sseett uupp oovveerr aa kknnoowwnn ccoonnttrrooll ppooiinntt aatt FFoorrtt JJeeffffeerrssoonn ((aass sseeeenn iinn FFiigguurree 44bb)) wwhhiicchh ggeenneerraatteedd ccoorrrreeccttiioonnaall iinnffoorrmmaattiioonn ttoo bbrrooaaddccaasstt vviiaaaaTTrriimmbblleeTTDDLL445500UUHHFFrardadioiototothteherorvoevreornotnhethseitsei.tTe.heTehqeueipqumiepnmt eunstedusfeodr tfhoer bthaesebawseaswaasTariTmrbimlebNleeNtRe9tRr9ecreeicveeivr ecrocnonnencetecdtedtotoa aZZepephhyyr r33GGNNSSSS ((GGlloobbaall NNaavviiggaattiioonn SSaatteelllliittee SSyysstteemm)) aanntteennnnaa.
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