Spectral variability within species and its effects on savanna tree species discrimination

M.A. Cho, P. Debba, R. Mathieu, J. van Aardt, G.P. Asner, L. Naidoo, R. Main, A. Ramoelo, B. Majeke

Research output: Chapter in Book/Report/Conference proceedingConference paper

2 Citations (Scopus)

Abstract

Differences in within-species phenology and structure driven by factors including topography, edaphic properties, and climatic variables present important challenges for species differentiation with remote sensing in the Kruger National Park, South Africa. The objective of this study was to examine probable factors including intraspecies spectral variability and the spectral sample size that could affect remote sensing of Savanna tree species across a land-use gradient in the Kruger National park. Eighteen species were examined: Acacia gerradii, Acacia nigrescens, Combretum apiculatum, Combretum collinum, Combretum hereroense, Combretum imberbe, Combretum zeyheri, Dichrostachys cinerea, Euclea sp (E. divinurum and E. natalensis, Gymnosporia sp (G. buxifolia and G. senegalensis), Lonchocarpus capassa, Peltoforum africanum, Piliostigma thonningii, Pterocarpus rotundifolia, Sclerocarya birrea, Strychnos sp (S. madagascariensis, S. usambarensis), Terminalia sericea and Ziziphus mucronata. Discriminating species using the K-nearest neighbour (K = 1) classifier with spectral angle mapper (SAM) yielded a higher classification accuracy (48% overall accuracy) compared to 16% for the classification involving the mean spectra for each species as the training spectral set. Within-species spectral variability and the training sample size were identified as important factors affecting classification accuracy of the tree species. We recommend a non-parametric classifier such as K-nearest neighbour classifier for classifying and mapping tree species in a highly complex environment such as the savanna system of the Kruger National Park. ©2009 IEEE.
Original languageEnglish
Title of host publicationInternational Geoscience and Remote Sensing Symposium (IGARSS), Cape Town, South Africa, 12 - 17 July, 2009
PublisherInstitute of Electrical and Electronics Engineers
PagesII190-II193
Volume2
ISBN (Print)9781424433957
DOIs
Publication statusPublished - 2009
Event2009 IEEE International Geoscience and Remote Sensing Symposium, Cape Town, South Africa -
Duration: 12 Jul 200917 Jul 2009

Conference

Conference2009 IEEE International Geoscience and Remote Sensing Symposium, Cape Town, South Africa
Period12/07/0917/07/09

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Cho, M. A., Debba, P., Mathieu, R., van Aardt, J., Asner, G. P., Naidoo, L., ... Majeke, B. (2009). Spectral variability within species and its effects on savanna tree species discrimination. In International Geoscience and Remote Sensing Symposium (IGARSS), Cape Town, South Africa, 12 - 17 July, 2009 (Vol. 2, pp. II190-II193). Institute of Electrical and Electronics Engineers. https://doi.org/10.1109/IGARSS.2009.5418038