EVALUATION OF SPOT DATA FOR TOPOGRAPHIC MAP REVISION AT THE NATIONAL LAND SURVEY OF SWEDEN

摘要

In a project carried out jointly by the National Land Survey (NLS) and the Swedish Space Corporation (SSC), SPOT data has been tested for map revision purposes. The main application focused on is a frequent revision of the new topographic map series at the scale of 1:50 000. The map features of current interest are roads, clearings and built-up areas. Comparison has been made with aerial photos. Results show no or minor differences in interpretations of roads and clearings from aerial photos, SPOT PAN or SPOT :xs regarding the different accuracy measures: completeness, shape and geometric accuracy. For urban areas, it is possible to interpret the delimitations of new areas for revision. The result also indicate that training is needed to fully take advantage of the multispectral images of SPOT. Costs and accessibility for SPOT data vs aerial photos are evaluated. Current work involves digital revision methods with SPOT data at NLS.