OBJECT BASED CHANGE DETECTION OF HISTORICAL AERIAL PHOTOGRAPHS REVEALS ALTITUDINAL FOREST EXPANSION
Object based image classification is applied to assess the upward advance of tree species in Finnish Lapland caused by the current global warming. An automated Feature Extraction Module (Fx) implemented in ENVI is used to extract the tree crowns from a digitized panchromatic aerial photograph acquir...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.409.5732 2023-05-15T18:40:07+02:00 OBJECT BASED CHANGE DETECTION OF HISTORICAL AERIAL PHOTOGRAPHS REVEALS ALTITUDINAL FOREST EXPANSION M. Middleton A P. Närhi A M-l. Sutinen B R. Sutinen A The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.409.5732 http://www.isprs.org/proceedings/XXXVIII/4-C1/Sessions/Session4/6791_middleton_Proc_pap.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.409.5732 http://www.isprs.org/proceedings/XXXVIII/4-C1/Sessions/Session4/6791_middleton_Proc_pap.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.isprs.org/proceedings/XXXVIII/4-C1/Sessions/Session4/6791_middleton_Proc_pap.pdf KEY WORDS text ftciteseerx 2016-01-08T03:13:23Z Object based image classification is applied to assess the upward advance of tree species in Finnish Lapland caused by the current global warming. An automated Feature Extraction Module (Fx) implemented in ENVI is used to extract the tree crowns from a digitized panchromatic aerial photograph acquired in 1947 and a false colour aerial photograph from 2003 of an altitudinal foresttundra ecotone on Lommoltunturi fell (a mountain shaped by Pleistocene glaciations). The two step Fx process included segmentation and feature classification with support vector machines with textural, spatial and spectral channels as inputs. The change in the resulted relative crown areas of Norway spruce (Picea abies) and downy birch (Betula pubenscens) were then assessed in GIS analysis, and compared to forest inventory and age data of saplings and trees. Within the last 56 years, Norway spruce has expanded uphill, in terms of distance, approximately 100 m and birch 40 to 60 m. In accordance with the birch-pine-spruce succession concept, the downy birch dominated forest-tundra ecotone stands are now replaced by Norway spruce. The treeline of Scots pine (Pinus sylvestris) reach the fell top (557 m a.sl.). The spruce and birch treelines reach 510 m. We did not find water availability, soil temperature nor N to be limiting factors in expansion of spruce-birch forest but a surplus of Al relative to base cations may disfavour spruce on some sites in the tundra. Primarily, the harsh winter wind-climate and spatial variability in thickness of snow cover are presently restricting the regeneration of trees on the open tundra. 1. Text Tundra Lapland Unknown Lommoltunturi ENVELOPE(24.162,24.162,67.995,67.995) Norway |
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ftciteseerx |
language |
English |
topic |
KEY WORDS |
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KEY WORDS M. Middleton A P. Närhi A M-l. Sutinen B R. Sutinen A OBJECT BASED CHANGE DETECTION OF HISTORICAL AERIAL PHOTOGRAPHS REVEALS ALTITUDINAL FOREST EXPANSION |
topic_facet |
KEY WORDS |
description |
Object based image classification is applied to assess the upward advance of tree species in Finnish Lapland caused by the current global warming. An automated Feature Extraction Module (Fx) implemented in ENVI is used to extract the tree crowns from a digitized panchromatic aerial photograph acquired in 1947 and a false colour aerial photograph from 2003 of an altitudinal foresttundra ecotone on Lommoltunturi fell (a mountain shaped by Pleistocene glaciations). The two step Fx process included segmentation and feature classification with support vector machines with textural, spatial and spectral channels as inputs. The change in the resulted relative crown areas of Norway spruce (Picea abies) and downy birch (Betula pubenscens) were then assessed in GIS analysis, and compared to forest inventory and age data of saplings and trees. Within the last 56 years, Norway spruce has expanded uphill, in terms of distance, approximately 100 m and birch 40 to 60 m. In accordance with the birch-pine-spruce succession concept, the downy birch dominated forest-tundra ecotone stands are now replaced by Norway spruce. The treeline of Scots pine (Pinus sylvestris) reach the fell top (557 m a.sl.). The spruce and birch treelines reach 510 m. We did not find water availability, soil temperature nor N to be limiting factors in expansion of spruce-birch forest but a surplus of Al relative to base cations may disfavour spruce on some sites in the tundra. Primarily, the harsh winter wind-climate and spatial variability in thickness of snow cover are presently restricting the regeneration of trees on the open tundra. 1. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
M. Middleton A P. Närhi A M-l. Sutinen B R. Sutinen A |
author_facet |
M. Middleton A P. Närhi A M-l. Sutinen B R. Sutinen A |
author_sort |
M. Middleton A |
title |
OBJECT BASED CHANGE DETECTION OF HISTORICAL AERIAL PHOTOGRAPHS REVEALS ALTITUDINAL FOREST EXPANSION |
title_short |
OBJECT BASED CHANGE DETECTION OF HISTORICAL AERIAL PHOTOGRAPHS REVEALS ALTITUDINAL FOREST EXPANSION |
title_full |
OBJECT BASED CHANGE DETECTION OF HISTORICAL AERIAL PHOTOGRAPHS REVEALS ALTITUDINAL FOREST EXPANSION |
title_fullStr |
OBJECT BASED CHANGE DETECTION OF HISTORICAL AERIAL PHOTOGRAPHS REVEALS ALTITUDINAL FOREST EXPANSION |
title_full_unstemmed |
OBJECT BASED CHANGE DETECTION OF HISTORICAL AERIAL PHOTOGRAPHS REVEALS ALTITUDINAL FOREST EXPANSION |
title_sort |
object based change detection of historical aerial photographs reveals altitudinal forest expansion |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.409.5732 http://www.isprs.org/proceedings/XXXVIII/4-C1/Sessions/Session4/6791_middleton_Proc_pap.pdf |
long_lat |
ENVELOPE(24.162,24.162,67.995,67.995) |
geographic |
Lommoltunturi Norway |
geographic_facet |
Lommoltunturi Norway |
genre |
Tundra Lapland |
genre_facet |
Tundra Lapland |
op_source |
http://www.isprs.org/proceedings/XXXVIII/4-C1/Sessions/Session4/6791_middleton_Proc_pap.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.409.5732 http://www.isprs.org/proceedings/XXXVIII/4-C1/Sessions/Session4/6791_middleton_Proc_pap.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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