alexa AVHRR NDVI Baseline for Natural Vegetation Ecosystems in Northern Canadian National Parks
ISSN: 2469-4134

Journal of Remote Sensing & GIS
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Research Article

AVHRR NDVI Baseline for Natural Vegetation Ecosystems in Northern Canadian National Parks

Yuhong He1*, Paul Dixon2, John F. Wilmshurst3 and Xulin Guo4
1Department of Geography, University of Toronto Mississauga, 3359 Mississauga North Road, Mississauga, ON L5L 1C6, Canada
2Western and Northern Service Center, Parks Canada, 145 McDermot Avenue, Winnipeg, MB, R3B 0R9, Canada
3Jasper National Park of Canada, P.O. Box 10, Jasper AB T0E 1E0, Canada
4Department of Geography, University of Saskatchewan, Room 110 Kirk Hall, 117 Science Place, Saskatoon SK S7N 5C8, Canada
Corresponding Author : Yuhong He
Department of Geography
University of Toronto Mississauga
3359 Mississauga North Road, Mississauga
ON L5L 1C6, Canada
Tel: 905-569-4679
Fax: 905-828-5273
E-mail: [email protected]
Received May 14, 2012; Accepted May 25, 2012; Published May 30, 2012
Citation: He Y, Dixon P, Wilmshurst JF, Guo X (2012) AVHRR NDVI Baseline for Natural Vegetation Ecosystems in Northern Canadian National Parks. J Geophys Remote Sensing 1:103. doi:10.4172/2169-0049.1000103
Copyright: © 2012 He Y, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Abstract

The establishment of a set of vegetation baseline values for the sub-arctic protected ecosystems would permit the identification of ecosystem change in the context of global change. A common satellite-based index, the Normalized Difference Vegetation Index (NDVI), has a long history of use and can be averaged to establish a “normal” vegetation condition in a given region for a given time. Based on an analysis of 23-year NDVI time series data derived from the Advanced Very High Resolution Radiometer (AVHRR) satellite imagery, this study investigated a simple method to establish a set of NDVI baseline for the sub-arctic natural ecosystems in the 12 Canadian northern National Parks. The key result of this study is that a set of annual and monthly NDVI baseline for each area of interest has been established. The NDVI baseline was further compared to a warm and a cool year to assess vegetation conditions. Comparison results indicated better vegetation conditions in warm years and worse vegetation conditions in cool year. The different deviation patterns over the years occurred in different parks, probably as the result of regional climatic properties, vegetation types, and elevations. The implication of this study is that newly-acquired NDVI values can be compared to this established baseline, both in a temporal and spatial dimension, to allow policy maker, land managers and other sub-arctic researchers to gauge the current conditions against those of previous years.

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