The potential of an unmanned aircraft system for surveying lake and river vegetation
Vegetation in and along aquatic systems has important regulatory and ecological functions. Aquatic vegetation is also frequently used as an indicator of environmental conditions. To enhance our knowledge of the complex natural processes in the littoral zone, i.e., the zone from the high water mark t...
Main Author: | |
---|---|
Format: | Master Thesis |
Language: | English |
Published: |
Luleå tekniska universitet, Geovetenskap och miljöteknik
2012
|
Subjects: | |
Online Access: | http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-18656 |
id |
ftluleatu:oai:DiVA.org:ltu-18656 |
---|---|
record_format |
openpolar |
spelling |
ftluleatu:oai:DiVA.org:ltu-18656 2023-05-15T17:45:08+02:00 The potential of an unmanned aircraft system for surveying lake and river vegetation Husson, Eva 2012 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-18656 eng eng Luleå tekniska universitet, Geovetenskap och miljöteknik Luleå Licentiate thesis / Luleå University of Technology, 1402-1757 http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-18656 urn:isbn:978-91-7439-523-5 Local 9a4b08af-9c05-4b64-9162-3cc9aba99f66 info:eu-repo/semantics/openAccess Ecology Ekologi Licentiate thesis, comprehensive summary info:eu-repo/semantics/masterThesis text 2012 ftluleatu 2022-10-25T20:50:54Z Vegetation in and along aquatic systems has important regulatory and ecological functions. Aquatic vegetation is also frequently used as an indicator of environmental conditions. To enhance our knowledge of the complex natural processes in the littoral zone, i.e., the zone from the high water mark to the lower limit of aquatic vegetation, it is critical to assess plant occurrence and abundance at the species level. This assessment is traditionally performed with labour-intensive field methods. Recently developed remote sensing systems with unmanned aircrafts that take aerial images at low flying height, offer new possibilities for surveying aquatic and riparian vegetation. Unmanned aerial systems (UASs) produce aerial images with sub-decimetre spatial resolution and high spatial accuracy at low cost and are highly flexible in time and space. The goal of this thesis was to evaluate the potential of an UAS for surveying non-submerged aquatic and riparian vegetation, including the identification of plants at the species level and vegetation mapping. Based on produced vegetation maps and field sampling, we also assessed the total biomass of entire riparian zones (320-m river stretches) and the biomass and trace metal content of dominant species along a pollution gradient. In total, the UAS was tested in four aquatic systems, two lakes and two rivers, in boreal northern Sweden. Generated orthoimages were interpreted visually. The spatial resolution varied from 5–5.6 cm. At two test sites we identified plant species with high accuracy (94.6 and 80.4% for aquatic and riparian vegetation, respectively). Prior knowledge on locally occurring species was necessary for correct species identification. The time needed for manual vegetation mapping increased with increasing vegetation complexity. At the test site for biomass assessment, biomass and trace element (Cu, Cd, and Zn) contents varied considerably between species. Salix sp. (willows) comprised only 3% of the total dominant-species biomass but contained 73% of all Cd ... Master Thesis Northern Sweden Luleå University of Technology Publications (DiVA) |
institution |
Open Polar |
collection |
Luleå University of Technology Publications (DiVA) |
op_collection_id |
ftluleatu |
language |
English |
topic |
Ecology Ekologi |
spellingShingle |
Ecology Ekologi Husson, Eva The potential of an unmanned aircraft system for surveying lake and river vegetation |
topic_facet |
Ecology Ekologi |
description |
Vegetation in and along aquatic systems has important regulatory and ecological functions. Aquatic vegetation is also frequently used as an indicator of environmental conditions. To enhance our knowledge of the complex natural processes in the littoral zone, i.e., the zone from the high water mark to the lower limit of aquatic vegetation, it is critical to assess plant occurrence and abundance at the species level. This assessment is traditionally performed with labour-intensive field methods. Recently developed remote sensing systems with unmanned aircrafts that take aerial images at low flying height, offer new possibilities for surveying aquatic and riparian vegetation. Unmanned aerial systems (UASs) produce aerial images with sub-decimetre spatial resolution and high spatial accuracy at low cost and are highly flexible in time and space. The goal of this thesis was to evaluate the potential of an UAS for surveying non-submerged aquatic and riparian vegetation, including the identification of plants at the species level and vegetation mapping. Based on produced vegetation maps and field sampling, we also assessed the total biomass of entire riparian zones (320-m river stretches) and the biomass and trace metal content of dominant species along a pollution gradient. In total, the UAS was tested in four aquatic systems, two lakes and two rivers, in boreal northern Sweden. Generated orthoimages were interpreted visually. The spatial resolution varied from 5–5.6 cm. At two test sites we identified plant species with high accuracy (94.6 and 80.4% for aquatic and riparian vegetation, respectively). Prior knowledge on locally occurring species was necessary for correct species identification. The time needed for manual vegetation mapping increased with increasing vegetation complexity. At the test site for biomass assessment, biomass and trace element (Cu, Cd, and Zn) contents varied considerably between species. Salix sp. (willows) comprised only 3% of the total dominant-species biomass but contained 73% of all Cd ... |
format |
Master Thesis |
author |
Husson, Eva |
author_facet |
Husson, Eva |
author_sort |
Husson, Eva |
title |
The potential of an unmanned aircraft system for surveying lake and river vegetation |
title_short |
The potential of an unmanned aircraft system for surveying lake and river vegetation |
title_full |
The potential of an unmanned aircraft system for surveying lake and river vegetation |
title_fullStr |
The potential of an unmanned aircraft system for surveying lake and river vegetation |
title_full_unstemmed |
The potential of an unmanned aircraft system for surveying lake and river vegetation |
title_sort |
potential of an unmanned aircraft system for surveying lake and river vegetation |
publisher |
Luleå tekniska universitet, Geovetenskap och miljöteknik |
publishDate |
2012 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-18656 |
genre |
Northern Sweden |
genre_facet |
Northern Sweden |
op_relation |
Licentiate thesis / Luleå University of Technology, 1402-1757 http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-18656 urn:isbn:978-91-7439-523-5 Local 9a4b08af-9c05-4b64-9162-3cc9aba99f66 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766147893193867264 |