Underlying data used were from the European Soil Database, the European Soil Bureau Network, and elevation data from the Shuttle Radar Topography Mission and the U.S. Geological Survey's GTOP030 data set.
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If ash recycling were considered on podzol areas, the suitability would be higher, especially in Finland and Sweden. The reduction in risk for compaction of soil when frozen during winter months has not been taken into account, which probably has resulted in underestimating the suitability in e.g. northern Finland.