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It is particularly important to remember where sand dunes are covered by large extents of scrub or woodland, as through the use of LIDAR DTM, slacks can be identified under scrub and tree vegetation; however this also gives the product unique advantages in considering vegetation recovery after scrub or tree clearance. \n\nGeographical coverage is incomplete because of limits in data available. It includes those areas where the Environment Agency, Natural England and the Regional Coastal Monitoring Programme have carried out sufficient aerial surveys. 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