The function converts a ud(stack) object to a SpatialLinesDataFrame.
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a DBBMM or DBBMMStack object, that includesa raster object
additional arguments that are passed on from other functions, most important being level which determines the contour level
The raster2contour function creates a SpatialLinesDataFrame from a given raster or DBBMM object. This allows to re-project the contours to different projections.
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