Journal article
Improving quantitative ventifact analysis for climate investigations using the Dyngjusandur sandsheet in Iceland as a planetary analogue
Journal of the Geological Society, Vol.182(3), jgs2024-173
05/05/2025
DOI: 10.1144/jgs2024-173
Appears in UI Libraries Support Open Access
Abstract
We use the Dyngjusandur sandsheet, Iceland, as a testbed to assess the type and number of measurements required to accurately represent ventifact orientations and extract paleowind information through a statistical evaluation of the differences between photogrammetric based and in situ measurements of ventifact feature orientations. Forty representative ventifacts were selected for in situ measurement, 20 of which were imaged for photogrammetric analysis to produce oriented and scaled virtual 3D models. An additional set of measurements were made on the “synthetic” models to allow for statistical assessment of erosional feature orientation. Despite the similarity between the photogrammetric (1145 measurements), and the in situ datasets (500 measurements), there are small, but significant differences in mean feature orientation that become more pronounced as sample size is reduced. Results indicate that in situ and photogrammetric methods of measuring feature orientation are comparable (to within 2° ± 2° at 1σ [N = 20] for inferring paleowind directions), but photogrammetric analyses require less time for data acquisition (by a factor of 0.36–0.66) and yields over five times (5.16×) as many measurements per ventifact, with additional advantages of being able to examine digital objects under different illumination conditions, magnifications, and from angles that are otherwise not possible in the field.
Details
- Title: Subtitle
- Improving quantitative ventifact analysis for climate investigations using the Dyngjusandur sandsheet in Iceland as a planetary analogue
- Creators
- Samuel X. Hudziak - University of IowaIngrid Ukstins - University of AucklandDavid Peate - University of IowaPatrick Whelley - University of Maryland, College ParkStephen Scheidt - University of Maryland, College ParkChristopher W. Hamilton - University of Arizona
- Resource Type
- Journal article
- Publication Details
- Journal of the Geological Society, Vol.182(3), jgs2024-173
- DOI
- 10.1144/jgs2024-173
- ISSN
- 0016-7649
- eISSN
- 2041-479X
- Publisher
- The Geological Society of London
- Grant note
- 3726349 / Royal Society New Zealand Catalyst Seeding grant 80GSFC17M0002 / Goddard Space Flight Center (http://dx.doi.org/10.13039/100006198) 80GSFC21M0002 / Goddard Space Flight Center (http://dx.doi.org/10.13039/100006198) 14-SSW14_2-0101 / Nasa Solar System Working grant
- Language
- English
- Electronic publication date
- 02/21/2025
- Date published
- 05/05/2025
- Academic Unit
- Earth and Environmental Sciences; Honors Program
- Record Identifier
- 9984790995802771
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