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Catchment area division 1990Valuma-aluejako 1990

Valuma-aluejako 1990Catchment area division 1990

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This dataset, completed in the early 1990s, contains Finland's main watershed areas, catchment area divisions, and discharge points. Catchment boundaries were delineated based on topography and waterways on 1:50,000 scale paper maps, then digitized using the FINGIS program via blind digitizing. The data follows a hierarchical catchment area classification. It provides a foundational geographic reference for hydrological analysis and water resource management across Finland.1990-luvun alussa valmistunut aineisto sisältää Suomen päävesistöalueet, valuma-aluejaon sekä purkupisteet. Valuma-alueet on rajattu topografian ja vesistöjen perusteella 1:50 000 mittakaavaisille paperikartoille, joilta alueet on digitoitu FINGIS-ohjelmalla sokkodigitointina. Hierarkkinen valuma...