BERÄKNING AV KVÄVE- OCH FOSFORTRANSPORT MED HJÄLP AV SATELLITBILD OCH GIS Bornsjöns avrinningsområde / Calculation of Transports of Nitrogen and Phosphorus by Using Satellite Images and GIS Bornsjön Catchment Area
A literature study and a case study have been made to investigate the possibility to use GIS and remote sensing for calculating transportation of phosphorus and nitrogen in a catchment. To classify the land use a Spot image was used together with a map of urban areas. Other parameters such as land use, inclination, soil type, and distance from open watercourse have been used to calculate the transportation rate in the USLE-model (the Universal Soil Loss Equation). The results from these two models have been compared with manual calculations of land use from a map in scale 1: 10,000 and measurements of phosphorus and nitrogen directly in the watercourses.