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Multisensor NDVI-Based Monitoring of the Tundra-Taiga Interface (Mealy Mountains, Labrador, Canada)
Department of Geography, Memorial University, St. John's, NL A1B 3X9, Canada
Stantec Consulting Ltd., 607 Torbay Road, St. John's, NL A1A 4Y6, Canada
* Author to whom correspondence should be addressed.
Received: 4 January 2013; in revised form: 26 February 2013 / Accepted: 26 February 2013 / Published: 1 March 2013
Abstract: The analysis of a series of five normalized difference vegetation index (NDVI) images produced information about a Labrador (Canada) portion of the tundra-taiga interface. The twenty-five year observation period ranges from 1983 to 2008. The series composed of Landsat, SPOT and ASTER images, provided insight into regional scale characteristics of the tundra-taiga interface that is usually monitored from coarse resolution images. The image set was analyzed by considering an ordinal classification of the NDVI to account for the cumulative effect of differences of near-infrared spectral resolutions, the temperature anomalies, and atmospheric conditions. An increasing trend of the median values in the low, intermediate and high NDVI classes is clearly marked while accounting for variations attributed to cross-sensor radiometry, phenology and atmospheric disturbances. An encroachment of the forest on the tundra for the whole study area was estimated at 0 to 60 m, depending on the period of observation, as calculated by the difference between the median retreat and advance of an estimated location of the tree line. In small sections, advances and retreats of up to 320 m are reported for the most recent four- and seven-year periods of observations.
Keywords: ASTER; Canada; Labrador; Landsat; multisensor; multitemporal; Normalized Difference Vegetation Index (NDVI); Subarctic; tree line; tundra-taiga interface; SPOT
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Simms, É.L.; Ward, H. Multisensor NDVI-Based Monitoring of the Tundra-Taiga Interface (Mealy Mountains, Labrador, Canada). Remote Sens. 2013, 5, 1066-1090.
Simms ÉL, Ward H. Multisensor NDVI-Based Monitoring of the Tundra-Taiga Interface (Mealy Mountains, Labrador, Canada). Remote Sensing. 2013; 5(3):1066-1090.
Simms, Élizabeth L.; Ward, Heather. 2013. "Multisensor NDVI-Based Monitoring of the Tundra-Taiga Interface (Mealy Mountains, Labrador, Canada)." Remote Sens. 5, no. 3: 1066-1090.