High resolution digital outcrop model of faults and fractures in caprock shales, Konusdalen West, central Spitsbergen
Structure-from-motion (SfM) photogrammetry has become an important tool for quantitative characterisation of outcrops. Digital outcrop models (DOMs) allow for the mapping of stratigraphy and discontinuous structures like folds, faults and fractures from cm to km scale and provide solutions that are...
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ftcopernicus:oai:publications.copernicus.org:essdd102842 2023-05-15T15:14:37+02:00 High resolution digital outcrop model of faults and fractures in caprock shales, Konusdalen West, central Spitsbergen Betlem, Peter Birchall, Thomas Lord, Gareth Oldfield, Simon Nakken, Lise Ogata, Kei Senger, Kim 2022-08-26 application/pdf https://doi.org/10.5194/essd-2022-143 https://essd.copernicus.org/preprints/essd-2022-143/ eng eng doi:10.5194/essd-2022-143 https://essd.copernicus.org/preprints/essd-2022-143/ eISSN: 1866-3516 Text 2022 ftcopernicus https://doi.org/10.5194/essd-2022-143 2022-08-29T16:22:54Z Structure-from-motion (SfM) photogrammetry has become an important tool for quantitative characterisation of outcrops. Digital outcrop models (DOMs) allow for the mapping of stratigraphy and discontinuous structures like folds, faults and fractures from cm to km scale and provide solutions that are difficult to constrain through subsurface data alone. With pristine, treeless exposures, the outcropping strata in Svalbard, Arctic Norway, hold exceptional potential for analogue studies and are ideally suited for the acquisition of high-resolution DOMs. We here present the acquisition, processing and integration of the Konusdalen West digital model data set, comprising both DOM and derived digital terrain model (DTM) data. Dronebased image acquisition took place over two weeks in July and August 2020. Fifteen differential GNSS control points were used to georeference and quality assure the model, five of which functioning as reference checkpoints. SfM processing of 5512 acquired images resulted in high-confidence, cm-scale resolution point clouds, textured mesh (DOM), tiled model, orthomosaics, and a DTM. The confidence-filtered dense cloud features a median inter-point distance of 1.57 cm and has an average point density of 3824.9 points m -2 . For the five checkpoints, the dense cloud features root mean square errors of 2.0 cm in X, 1.3 cm in Y, 5.2 cm in Z, and 5.7 cm in XYZ. Drops in point confidence and point density are mainly found in areas with reduced image densities, and on the backside of boulders. Increased confidences and densities are present along the western flank of the Konusdalen West outcrop, where a fault-fracture network in mudstone-dominated stata is best exposed and photographed most extensively. The Konusdalen West DOM and DTM cover a 0.12 km 2 area and span a 170 m elevation difference. The mean of the altitude of the checkpoints versus elevation of the dense cloud-derived DTM differed by less than a cm. The dense cloud-derived DTM closely matches an existing lower-resolution reference DTM ... Text Arctic Svalbard Spitsbergen Copernicus Publications: E-Journals Arctic Konusdalen ENVELOPE(15.917,15.917,78.333,78.333) Norway Resolution Point ENVELOPE(-27.117,-27.117,-59.433,-59.433) Svalbard |
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Open Polar |
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Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
Structure-from-motion (SfM) photogrammetry has become an important tool for quantitative characterisation of outcrops. Digital outcrop models (DOMs) allow for the mapping of stratigraphy and discontinuous structures like folds, faults and fractures from cm to km scale and provide solutions that are difficult to constrain through subsurface data alone. With pristine, treeless exposures, the outcropping strata in Svalbard, Arctic Norway, hold exceptional potential for analogue studies and are ideally suited for the acquisition of high-resolution DOMs. We here present the acquisition, processing and integration of the Konusdalen West digital model data set, comprising both DOM and derived digital terrain model (DTM) data. Dronebased image acquisition took place over two weeks in July and August 2020. Fifteen differential GNSS control points were used to georeference and quality assure the model, five of which functioning as reference checkpoints. SfM processing of 5512 acquired images resulted in high-confidence, cm-scale resolution point clouds, textured mesh (DOM), tiled model, orthomosaics, and a DTM. The confidence-filtered dense cloud features a median inter-point distance of 1.57 cm and has an average point density of 3824.9 points m -2 . For the five checkpoints, the dense cloud features root mean square errors of 2.0 cm in X, 1.3 cm in Y, 5.2 cm in Z, and 5.7 cm in XYZ. Drops in point confidence and point density are mainly found in areas with reduced image densities, and on the backside of boulders. Increased confidences and densities are present along the western flank of the Konusdalen West outcrop, where a fault-fracture network in mudstone-dominated stata is best exposed and photographed most extensively. The Konusdalen West DOM and DTM cover a 0.12 km 2 area and span a 170 m elevation difference. The mean of the altitude of the checkpoints versus elevation of the dense cloud-derived DTM differed by less than a cm. The dense cloud-derived DTM closely matches an existing lower-resolution reference DTM ... |
format |
Text |
author |
Betlem, Peter Birchall, Thomas Lord, Gareth Oldfield, Simon Nakken, Lise Ogata, Kei Senger, Kim |
spellingShingle |
Betlem, Peter Birchall, Thomas Lord, Gareth Oldfield, Simon Nakken, Lise Ogata, Kei Senger, Kim High resolution digital outcrop model of faults and fractures in caprock shales, Konusdalen West, central Spitsbergen |
author_facet |
Betlem, Peter Birchall, Thomas Lord, Gareth Oldfield, Simon Nakken, Lise Ogata, Kei Senger, Kim |
author_sort |
Betlem, Peter |
title |
High resolution digital outcrop model of faults and fractures in caprock shales, Konusdalen West, central Spitsbergen |
title_short |
High resolution digital outcrop model of faults and fractures in caprock shales, Konusdalen West, central Spitsbergen |
title_full |
High resolution digital outcrop model of faults and fractures in caprock shales, Konusdalen West, central Spitsbergen |
title_fullStr |
High resolution digital outcrop model of faults and fractures in caprock shales, Konusdalen West, central Spitsbergen |
title_full_unstemmed |
High resolution digital outcrop model of faults and fractures in caprock shales, Konusdalen West, central Spitsbergen |
title_sort |
high resolution digital outcrop model of faults and fractures in caprock shales, konusdalen west, central spitsbergen |
publishDate |
2022 |
url |
https://doi.org/10.5194/essd-2022-143 https://essd.copernicus.org/preprints/essd-2022-143/ |
long_lat |
ENVELOPE(15.917,15.917,78.333,78.333) ENVELOPE(-27.117,-27.117,-59.433,-59.433) |
geographic |
Arctic Konusdalen Norway Resolution Point Svalbard |
geographic_facet |
Arctic Konusdalen Norway Resolution Point Svalbard |
genre |
Arctic Svalbard Spitsbergen |
genre_facet |
Arctic Svalbard Spitsbergen |
op_source |
eISSN: 1866-3516 |
op_relation |
doi:10.5194/essd-2022-143 https://essd.copernicus.org/preprints/essd-2022-143/ |
op_doi |
https://doi.org/10.5194/essd-2022-143 |
_version_ |
1766345057359626240 |