What to do in Saint-Tropez in September? Your holidays will be in the sun and more precisely in Saint-Tropez in September, good for you! You are one of the lucky ones for whom the start of the school year will be a matter of choice when it comes to stopping your leisure activities.
Canadian Wetland Inventory CWI started in spring and was first aimed to develop a method to map 5 wetland classes stratification, based on the Canadian Wetland Classification System, with a minimal mapping unit of 1 hectare.
The 5 wetlands classes for the CWI are: The Landsat-ETM images are acquired, when possible, in summer at a time when vegetation exhibit high level of activity and Radarsat images must be acquired during spring flood or during a period of high water in fall.
The mapping method, developed by the Canadian Wildlife Service CWS Quebec region, applies spectral, spatial and texture classification of satellite images using a top-down approach coarser to the finer spatial objects with a segmentation algorithm. The method was tested on 5 study sites: Theses sites provide a wide range of different wetland classes in varied environment which helped test the mapping method before applying it to large areas.
Following the top-down approach requires that spatial objects in the images be identified starting at the coarser level, and gradually to finer levels, according to the size of the objects of interest: Generally 3 segmentation levels are required: The coarse levels allow toidentify large spatial ensembles.
This level also allows to identify medium size wetlands. The smallest wetlands are identified at this level, but always keeping in mind the spatial objects must be larger than 1 ha to be compatible with the CWI minimum mapping unit.
Hierarchical classification optimizes wetland identification and reduces multi-class confusion. Sets of rules are assigned to each class based on membership functions using spatial and spectral attributes such as mean, ratio, texture, shape, neighbourhood, etc.
This time may be reduced with better contextual knowledge of landscape or with use of more specific membership functions. The spatial and temporal variability of wetland lead to a validation strategy using the best knowledge' approach instead of comparing the final classification with other map products or ground-based plots.
For the Wetlands vs Uplands map accuracy, the visual evaluation of the cells by a qualified interpreter allows detection of wetlands greater than 1 ha in upland. For the thematic and spatial accuracy of wetland polygons, the visual evaluation of the selected polygons is done by an interpreter who validates the wetland type and the spatial limit of the polygon.
The classification of satellite images using a top-down approach with a segmentation algorithm is adaptable and matches the CWI requirements for the Quebec region.
The multi-level segmentation allows wetland identification at levels that best fit variable wetland sizes. The 5 wetland classes at a regional scale are well suited to thematic mapping using satellite remote sensing.
The results demonstrate the efficiency of the proposed method leading to high accuracy map of wetlands in a wide range of environments.Juste deux mots pour vous remercier d'avoir sauvé ma saison.
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Plan your peaceful Christmas: maintaining your home during the holidays. The flat is clean brand new and fully furnished. Confortable, very good qualité brand new bed. Sheets, pillows with pillow cases, duvet, hand and bath towels, dish towels, washcloths are provided, so is the kitchen and all breakfast supplies.
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