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Defining extent of winter flooding using RADAR data - BD0212

Winter flooding of grassland is important for maintaining populations of wintering waterfowl and waders. Mapping extent of flooding has previously been attempted on the ground in combination with surveys of overwintering birds but has proved to be very problematic. This study will use radar imagery, as collected via the ERS-1 satellite, to delineate the limits of winter flooding in the Somerset Levels and Moors ESA in the winters of 1991/1992 and 1994/1995. The relationship between flooding and Tier III agreement land will also be determined using digital overlays. A series of images for the ESA for each of the winter periods will be obtained and classified, allowing delineation of the extend of flooding and change over the period. Time series images will allow separation of permanent and temporary water bodies, with images being available every 16 days. Classification and enhancement techniques that maximise the use of radar data will be evaluated, while ESA monitoring ground survey data will facilitate validation of results. Furthermore, location of the Tier III water level agreement areas will be superimposed over the interpreted imagery data using the GIS capability of the ERDAS Imagine system, allowing evaluation of flooded areas in relation to raised water level agreements.
Time-Scale and Cost
From: 1995

To: 1996

Cost: £21,000
Contractor / Funded Organisations
Fields of Study
Environmental Stewardship