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MetalMapper Survey, Fort Rucker, AL
[Technical Report, Other]
BLACK TUSK GEOPHYSICS INC VANCOUVER (CANADA)
Pagination or Media Count:
This report describes advanced classification processing of MetalMapper Classic time-domain electromagnetic data collected at Fort Rucker, Alabama. The objective of this work was to test a primarily automated library-based classification approach at the Fort Rucker Site. Black Tusk Geophysics BTG processed 402 cued interrogations to recover estimates of intrinsic dipole polarizabilities for detected sources. Estimated polarizabilities were used to identify potential novel TOI at the site via cluster analysis and comparison with a comprehensive polarizability library. As ground truth information was made available via training or analyst calibration digs, the polarizability library was supplemented with new polarizabilities. The Fort Rucker classification presented significant challenges for the library-based classification approach. The polarizabilities of TOI on site exhibited a high level of variability due to the range of physical condition and state of the TOI encountered. There were several non-TOI items with polarizabilities that were similar to those in the library. In SERDP project MR-2226, a dataset degree of difficulty was defined that provides an objective measure of the likely difficulty of classification. The measure of difficulty for Fort Rucker indicates it is essentially the most challenging ESTCP live site of those that were performed between 2011 and 2013 and processed by BTG. The main source of difficulty is the overlap in size-decay space of the majority of non-TOI features with some of the TOI features. i.e., much of the scrap at Fort Rucker has polarizabilities that look like TOI particularly, rocket motors.
[A, Approved For Public Release]