FYRISÅNS AVRINNINGSOMRÅDE KLASSAT FRÅN SATELLITDATA OCH DIGITAL KARTDATA / The Catchment Area of River Fyrisån Classified from Satellite Data and Digital Map Data
There are several ways to obtain information about land use and vegetation for an area. In this project we have used satellite images to calculate statistics for the drainage area of River Fyrisån in Uppland, Sweden. A Landsat TM (Thematic mapper) image registered on the 7th of July, 1989 was used. The spectral information in the TM channels 3, 4 and 5 was used for an unsupervised multispectral classification. Together with field work 13 classes of vegetation were extracted. This result was enhanced by using a digitally scanned map in the scale of 1:250,000. By using a digital map some problems and limitations with the multispectral classification was fixed and the result enhanced. In the final area calculations, 21 classes were used. A short description of those is given in the text. The digital form of the data made statistics and area measurement easy. Area measurements are otherwise usually a time consuming work, especially for areas of this size. “Complete abstract not presented.”