Provencher-Nolet, Laurence; Bernier, Monique; Lévesque, Esther
(2014).
Short term change detection in tundra vegetation near Umiujaq, Subarctic Quebec, Canada.
In: IEEE International Geoscience and Remote Sensing Symposium - IGARSS 2014, 13-18 juillet 2014, Québec, Canada.
Résumé
Local vegetation changes since the last 20 years are being
investigated at the transition zone between the subarctic and
the arctic region in Nunavik (Quebec, Canada). By using
high resolution aerial photographs acquired at the end of
summer 1994 and 2010 and image processing techniques,
we established the dominant vegetation changes and created
a « from-to » vegetation map. Results show a significant
increase in shrub dominated cover and a loss of lichen
dominated zones. Number and area of ponds have also
diminished over time. Moreover, according to the change
detection analysis, all major vegetation classes had the
largest shift in favour of the shrub class. Thus, the final
change map illustrates the general shrubification ongoing in
the region and pinpoints permafrost degradation zones as
principal areas affected by the expansion of shrubs.
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