If the class is not seen on site or samples are not collected for a class, it cannot be mapped. For a class to be mapped on site there must have been samples collected for it on site. A good spatial coverage of ground data around the site is recommended, although not always practically achievable. Some variations between the CASI data and situation on site at the time of ground data collection are possible. It has not been collected at the same time as CASI or LIDAR capture it is normally within a couple of months of CASI capture. The collection of ground data used in the classification has some limitations. In instances where datasets are not coincidentally captured there may be some errors brought about by seasonal, developmental or anthropological change in the habitat. CASI, LIDAR and OS-base mapping data), which may or may not have been captured coincidentally. Habitat maps generated by Geomatics are often derived using multiple data sources (e.g. These characteristics are then used to classify the remaining areas into one of the different habitats. We use ground data to identify the characteristics of the different habitats in the CASI and LIDAR data. The classification uses ground data from sites collected near to the time of CASI capture. The habitat map is derived from CASI multispectral data, LIDAR elevation data and other GIS products. It includes those areas where the Environment Agency, Natural England and the Regional Coastal Monitoring Programme have carried out sufficient aerial and ground surveys in England. Geographical coverage is incomplete because of limits in data available. The habitat map is a polygon shapefile showing site relevant habitat classes. A habitat map derived from airborne data, specifically CASI (Compact Airborne Spectrographic Imager) and LIDAR (Light Detection and Ranging) data. This record is for Approval for Access product AfA439.
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