Measuring (subglacial) bedform orientation, length, and longitudinal asymmetry – Method assessment

Marco G Jorge and Tracy A Brennand

PLOS ONE, 2017, vol. 12, issue 3, 1-17

Abstract: Geospatial analysis software provides a range of tools that can be used to measure landform morphometry. Often, a metric can be computed with different techniques that may give different results. This study is an assessment of 5 different methods for measuring longitudinal, or streamlined, subglacial bedform morphometry: orientation, length and longitudinal asymmetry, all of which require defining a longitudinal axis. The methods use the standard deviational ellipse (not previously applied in this context), the longest straight line fitting inside the bedform footprint (2 approaches), the minimum-size footprint-bounding rectangle, and Euler’s approximation. We assess how well these methods replicate morphometric data derived from a manually mapped (visually interpreted) longitudinal axis, which, though subjective, is the most typically used reference. A dataset of 100 subglacial bedforms covering the size and shape range of those in the Puget Lowland, Washington, USA is used. For bedforms with elongation > 5, deviations from the reference values are negligible for all methods but Euler’s approximation (length). For bedforms with elongation

Date: 2017
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Persistent link: https://EconPapers.repec.org/RePEc:plo:pone00:0174312

DOI: 10.1371/journal.pone.0174312

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