This data set gives a point set with altitudes, digitized from the 1:10,000 topographical map of the Netherlands.
This data frame contains the following columns:
a numeric vector; x-coordinate (m) in RDM (Dutch topographical map coordinates)
a numeric vector; y-coordinate (m) in RDM (Dutch topographical map coordinates)
altitude in m. above NAP (Dutch zero for sea level)
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