Investigating Sand Dune Location, Orientation and Geomorphometry Through GEOBIA-Based Mapping: A Case Study in Northern Sweden
Climate change has repeatedly been framed as the defining issue of the Anthropocene and with the Arctic changing at unpreceded speed need is high for a profound understanding of the Northern Swedish landscape. Northern Swedish aeolian sand dunes have been impacted by climatic changes throughout time...
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Uppsala universitet, Institutionen för geovetenskaper
2020
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ftuppsalauniv:oai:DiVA.org:uu-424975 2023-05-15T15:17:35+02:00 Investigating Sand Dune Location, Orientation and Geomorphometry Through GEOBIA-Based Mapping: A Case Study in Northern Sweden En undersökning av rumslig förekomst, orientering och morfometri hos fossila sanddyner genom GEOBIA-baserad kartläggning: en fallstudie i norra Sverige Stammler, Melanie 2020 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-424975 eng eng Uppsala universitet, Institutionen för geovetenskaper http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-424975 info:eu-repo/semantics/openAccess sand dunes geomorphological mapping object-based image analysis landscape development sanddyner geomorfologisk kartläggning geografisk objektbaserad bildanalys landskapsutveckling Physical Geography Naturgeografi Student thesis info:eu-repo/semantics/bachelorThesis text 2020 ftuppsalauniv 2023-02-23T21:53:53Z Climate change has repeatedly been framed as the defining issue of the Anthropocene and with the Arctic changing at unpreceded speed need is high for a profound understanding of the Northern Swedish landscape. Northern Swedish aeolian sand dunes have been impacted by climatic changes throughout time. Their location, orientation and geomorphometry can therefore be used to explore past wind patterns and dune activity. By systematically and spatially mapping the dunes, patterns in location can be illustrated, dune orientations investigated, the dunes’ geomorphometry characterised and sediment sources determined. Based on this knowledge, insight in landscape development along with a better understanding of long-term landscape (in)stability in Northern Sweden can be gained. This M. Sc. thesis sets out to summarize useful concepts to understand the formation of Northern Swedish aeolian sand dunes and to derive its implications for understanding landscape development. Based thereon, it deduces the strong need to systematically and spatially analyse aeolian sand dunes in Northern Sweden. The use of geographic object-based image analysis (GEOBIA) allows for the detection of potential dune locations over a large area and provides defined and reproducible mapping boundaries. Polygons are created by segmenting a residual-relief separated digital elevation model (DEM) as well as slope and curvature data. The multi-resolution segmentation provides best results with a scale parameter of 15 and a homogeneity criterion of 0.1 for the shape criterion, as well as 0.5 for the compactness criterion. A rule-based classification with empirically derived parameters accepts on average 2.5 % of the segmented image objects as potential dune sites. Subsequent expert-decision confirms on average 25 % of the classified image objects as identified dune locations. The rule-based classification provides best results when targeting a smaller area as this allows for less variability within the dune characteristics. The investigation of ... Bachelor Thesis Arctic Climate change Norra Sverige Northern Sweden Uppsala University: Publications (DiVA) Arctic |
institution |
Open Polar |
collection |
Uppsala University: Publications (DiVA) |
op_collection_id |
ftuppsalauniv |
language |
English |
topic |
sand dunes geomorphological mapping object-based image analysis landscape development sanddyner geomorfologisk kartläggning geografisk objektbaserad bildanalys landskapsutveckling Physical Geography Naturgeografi |
spellingShingle |
sand dunes geomorphological mapping object-based image analysis landscape development sanddyner geomorfologisk kartläggning geografisk objektbaserad bildanalys landskapsutveckling Physical Geography Naturgeografi Stammler, Melanie Investigating Sand Dune Location, Orientation and Geomorphometry Through GEOBIA-Based Mapping: A Case Study in Northern Sweden |
topic_facet |
sand dunes geomorphological mapping object-based image analysis landscape development sanddyner geomorfologisk kartläggning geografisk objektbaserad bildanalys landskapsutveckling Physical Geography Naturgeografi |
description |
Climate change has repeatedly been framed as the defining issue of the Anthropocene and with the Arctic changing at unpreceded speed need is high for a profound understanding of the Northern Swedish landscape. Northern Swedish aeolian sand dunes have been impacted by climatic changes throughout time. Their location, orientation and geomorphometry can therefore be used to explore past wind patterns and dune activity. By systematically and spatially mapping the dunes, patterns in location can be illustrated, dune orientations investigated, the dunes’ geomorphometry characterised and sediment sources determined. Based on this knowledge, insight in landscape development along with a better understanding of long-term landscape (in)stability in Northern Sweden can be gained. This M. Sc. thesis sets out to summarize useful concepts to understand the formation of Northern Swedish aeolian sand dunes and to derive its implications for understanding landscape development. Based thereon, it deduces the strong need to systematically and spatially analyse aeolian sand dunes in Northern Sweden. The use of geographic object-based image analysis (GEOBIA) allows for the detection of potential dune locations over a large area and provides defined and reproducible mapping boundaries. Polygons are created by segmenting a residual-relief separated digital elevation model (DEM) as well as slope and curvature data. The multi-resolution segmentation provides best results with a scale parameter of 15 and a homogeneity criterion of 0.1 for the shape criterion, as well as 0.5 for the compactness criterion. A rule-based classification with empirically derived parameters accepts on average 2.5 % of the segmented image objects as potential dune sites. Subsequent expert-decision confirms on average 25 % of the classified image objects as identified dune locations. The rule-based classification provides best results when targeting a smaller area as this allows for less variability within the dune characteristics. The investigation of ... |
format |
Bachelor Thesis |
author |
Stammler, Melanie |
author_facet |
Stammler, Melanie |
author_sort |
Stammler, Melanie |
title |
Investigating Sand Dune Location, Orientation and Geomorphometry Through GEOBIA-Based Mapping: A Case Study in Northern Sweden |
title_short |
Investigating Sand Dune Location, Orientation and Geomorphometry Through GEOBIA-Based Mapping: A Case Study in Northern Sweden |
title_full |
Investigating Sand Dune Location, Orientation and Geomorphometry Through GEOBIA-Based Mapping: A Case Study in Northern Sweden |
title_fullStr |
Investigating Sand Dune Location, Orientation and Geomorphometry Through GEOBIA-Based Mapping: A Case Study in Northern Sweden |
title_full_unstemmed |
Investigating Sand Dune Location, Orientation and Geomorphometry Through GEOBIA-Based Mapping: A Case Study in Northern Sweden |
title_sort |
investigating sand dune location, orientation and geomorphometry through geobia-based mapping: a case study in northern sweden |
publisher |
Uppsala universitet, Institutionen för geovetenskaper |
publishDate |
2020 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-424975 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Climate change Norra Sverige Northern Sweden |
genre_facet |
Arctic Climate change Norra Sverige Northern Sweden |
op_relation |
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-424975 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766347830223437824 |