RP Armitage
Identification of the spectral characteristics of British semi-natural upland vegetation using direct ordination: a case study from Dartmoor, UK
Armitage, RP; Kent, M; Weaver, RE
Authors
M Kent
RE Weaver
Abstract
The direct ordination technique Canonical Correspondence Analysis (CCA) is applied to the examination of the relationships between the floristic composition of semi-natural vegetation and its spectral reflectance. Paired measurements of floristic and spectral characteristics, the latter being measured using a portable field spectrometer, were collected at ground level for a range of upland semi-natural vegetation within two study sites on Dartmoor, south-west England. The spectral data were converted to simulate a Compact Airborne Spectrographic Imager (CASI) bandset. Both floristic and spectral data sets were then jointly ordinated using CCA. A sequence of individual species changes along the first ordination axis was identified that showed a strong correspondence with variation in the simulated CASI wavebands covering the 736 nm to 870 nm wavelengths. A significant relationship between first axis CCA scores for quadrats and their estimated total percentage vegetation cover was also identified. Although UK National Vegetation Classification (NVC) categories corresponded to a general sequence of plant community types along the first CCA axis, with the possible exception of the U20 Pteridium aquilinum-dominated community, it proved impossible to demonstrate any close link between any specific plant community type and a distinct set of spectral characteristics because of the continuum nature of the vegetation. The second axis of the CCA showed no interpretable relationship with variation in floristic/spectral data and this was confirmed further by use of Detrended Canonical Correspondence Analysis (DCCA). Possibilities for further research into floristic/spectral data using CCA/DCCA are discussed.
Citation
Armitage, R., Kent, M., & Weaver, R. (2004). Identification of the spectral characteristics of British semi-natural upland vegetation using direct ordination: a case study from Dartmoor, UK. International Journal of Remote Sensing, 25(17), 3369-3388. https://doi.org/10.1080/01431160310001654464
Journal Article Type | Article |
---|---|
Publication Date | Sep 10, 2004 |
Deposit Date | Oct 8, 2007 |
Journal | International Journal of Remote Sensing |
Print ISSN | 0143-1161 |
Publisher | Taylor and Francis |
Peer Reviewed | Peer Reviewed |
Volume | 25 |
Issue | 17 |
Pages | 3369-3388 |
DOI | https://doi.org/10.1080/01431160310001654464 |
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