The Lagoon data was created from the orthoimagery and GIS analysis. Lagoons connected to the sea were identified from the aerial images provided by the National Land Survey of Finland and were digitized by utilizing the shoreline data from the chart. Selection criteria were e.g. enclosed nature. Unattached lagoons, gloe lakes, were bordered by using the lake data from the topographic database (National Land Survey of Finland) and contour lines. Water areas lower than 2,5 m asl were selected to add to the lagoon data. Lakes above 2,5 m have most probably been separate lagoons for a long time and therefore interpreted as gloe lakes that are not included into the final lagoon data.
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