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Mapping of Welwitschia Mirabilis with high resolution satellite imagery in the Namib Desert


Kellenberger, T; Kneubühler, M (2009). Mapping of Welwitschia Mirabilis with high resolution satellite imagery in the Namib Desert. In: IEEE International Geoscience and Remote Sensing Symposium, Cape Town, ZA, 12 July 2009 - 17 July 2009, 4.

Abstract

This study is about a non-invasive mapping technique of
Welwitschia mirabilis in its habitat, the Namib-Naukluft
Park, based on spatially high resolved satellite images. First, two satellite data sets from IKONOS and Quickbird satelliteare geometrically corrected, including GPS ground control points and a digital elevation model. Second, Welwitschia individuals, bushes, sandy and rocky surroundings are successfully mapped with a supervised and object-oriented classification approach. GPS points, training samples and verification objects have been collected previously in a field survey. 49 of 55 (89%) Welwitschia individuals known in ground reference, were classified successfully in both data sets, despite the limited spectral and spatial resolution. Compared to a pixel-based classification of Welwitschia with IKONOS data also published on this conference, it was shown, that the object-oriented approach improves the mapping precision of Welwitschia species. The presented area wide mapping technique from space is effective and non-invasive, but limited by the spatial and spectral resolution of the input satellite data.

This study is about a non-invasive mapping technique of
Welwitschia mirabilis in its habitat, the Namib-Naukluft
Park, based on spatially high resolved satellite images. First, two satellite data sets from IKONOS and Quickbird satelliteare geometrically corrected, including GPS ground control points and a digital elevation model. Second, Welwitschia individuals, bushes, sandy and rocky surroundings are successfully mapped with a supervised and object-oriented classification approach. GPS points, training samples and verification objects have been collected previously in a field survey. 49 of 55 (89%) Welwitschia individuals known in ground reference, were classified successfully in both data sets, despite the limited spectral and spatial resolution. Compared to a pixel-based classification of Welwitschia with IKONOS data also published on this conference, it was shown, that the object-oriented approach improves the mapping precision of Welwitschia species. The presented area wide mapping technique from space is effective and non-invasive, but limited by the spatial and spectral resolution of the input satellite data.

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Additional indexing

Item Type:Conference or Workshop Item (Paper), not refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Geography
Dewey Decimal Classification:910 Geography & travel
Language:English
Event End Date:17 July 2009
Deposited On:01 Oct 2009 15:49
Last Modified:05 Apr 2016 13:21
Additional Information:Copyright 2009 IEEE. Published in the IEEE 2009 International Geoscience & Remote Sensing Symposium (IGARSS 2009), scheduled for July 13-17, 2009 in Cape Town, South Africa. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works, must be obtained from the IEEE. Contact: Manager, Copyrights and Permissions / IEEE Service Center / 445 Hoes Lane / P.O. Box 1331 / Piscataway, NJ 08855-1331, USA. Telephone: + Intl. 908-562-3966.
Publisher DOI:10.1109/IGARSS.2009.5417389
Official URL:http://www.igarss09.org/default.asp
Permanent URL: http://doi.org/10.5167/uzh-20801

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