National land cover mapping for air pollution studies

A national land use map was produced in this project using IRS WiFS satellite data and supporting ancillary data. IRS WiFS satellite data only, without support from ancillary information, was found not to yield satisfactory accuracy given the classes required by the ASTA programme. When used integrated with county statistics on forest and agricultural areas, as well as digital maps, the results, however, reached an acceptable quality level. Accuracy assessment could not be carried out in all counties of Sweden, and therefore the data should be used with caution if the end users are interested in regional or local scales rather than the national perspective. This does however not mean that the data cannot be used for local applications. In most areas the accuracy is good also with aggregations of 0.5 km or 1 kilometre resolutions.

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