sample image		filename: v4_dcw_contour_lin formats: Shapefile (ascii) GIS data type: lines number of records: 92626 version note: New Projection V4, please use v4_dcw_contour_lin Derived from Digital Chart of the World (DCW) dataset. Includes elevation values (1000 foot increments). For general reference purposes only. This dataset is a reprojection of the Penn State DCW files which have been available for public download since 1997. [DCW images show 1990 Provinces as background]
production notes - data sources