E-mail : maria.dissanska@ete.inrs.ca 

Evaluation of the spatial structure (terrestrial versus aquatic components) of the LaGrande complex wetlands using satellite imagery
Supervisor : Monique Bernier, INRS-ETE
Co-supervisor : Serge Payette


Maria Dissanska.jpg

Peatlands are one of the most import ecosystems in the James Bay region, occupying about 12 % of the region’s area. A preliminary aerial inventory of the peatlands of the entire LaGrande complex suggest that several peatlands possess more aquatic than terrestrial surface. This change in the peatlands hydrological regime may be a consequence of the an aqualyzing process that transforms the surface of the peatland through a mechanism that expands peatland ponds and creates new ones in depressions with the end result being a more aquatic ecosystem. The objectives of the research are: i, to evaluate the area occupied by terrestrial components (hummocks and depressions) and aquatic components (ponds and small lakes) with the aid of high resolution Quickbird (61 cm) and IKONOS (1-4 m resolution) satellite images, and ii, to compare these results with those obtained by analyzing aerial photographs taken during the 1950s in order to better understand the evolution of the aquatic surfaces over the past 50 years.

Publication

Dissanska, M., Bernier, M., Payette, S. 2009. Object-based classification of very high resolution panchromatic images for evaluating recent changes in the structure of patterned peatlands. Canadian Journal of Remote Sensing, 35 : 189-215.