Your feedback is important to us. Contact us. The North American
Atlas - Sea Ice data set shows the approximate extent of marine
areas in the Arctic covered by permanent polar ice. The data
originated from the Canadian Ice Service and was used in the
1:6,000,000 National Atlas of Canada Reference Map Series. It is
represented by polygons showing the average minimum ice limit
over a 30 year period, 1969-1999. A joint venture involving the
National Atlas programs in Canada (Natural Resources Canada),
Mexico (Instituto Nacional de Estadística Geografía e
Informática), and the United States (U.S. Geological Survey), as
well as the North American Commission for Environmental Co-
operation, has led to the release (June 2004) of several new
products: an updated paper map of North America, and its
associated geospatial data sets and their metadata. These data
sets are available online from each of the partner countries
both for visualization and download. The North American Atlas
data are standardized geospatial data