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 sets at 1:10,000,000 scale. A variety of basic data layers (e.g. roads, railroads, populated places, political boundaries, hydrography, bathymetry, sea ice and glaciers) have been integrated so that their relative positions are correct. This collection of data sets forms a base with which other North American thematic data may be integrated. Any data outside of Canada, Mexico, and the United States of America included in the North American Atlas data sets is strictly to complete the context of the data.
The North American Atlas data are intended for geographic display and analysis at the national and continental level. These data should be displayed and analyzed at scales appropriate for 1:10,000,000-scale data. No responsibility is assumed by Natural Resources Canada, Instituto Nacional de Estadística Geografía e Informática, or the U.S. Geological Survey in the use of these data.
The Commission for Environmental Cooperation (CEC) is an international organization created by Canada, Mexico, and the United States of America under the North American Agreement on Environmental Cooperation (NAAEC). The CEC was established to address regional environmental concerns, help prevent potential trade and environmental conflicts, and to promote the effective enforcement of environmental law. The Agreement complements the environmental provisions of the North American Free Trade Agreement (NAFTA). Further information on the CEC is available from http://www.cec.org/ or from: Commission for Environmental Cooperation 393, rue St-Jacques Ouest Bureau 200 Montréal (Québec) H2Y 1N9 Canada Telephone: 514 350 4300 Facsimile: 514 350 4314 Electronic mail: firstname.lastname@example.org Mapping North American Environmental Issues The CEC works with key mapping agency partners in Canada, Mexico, and the United States to promote understanding of significant continental-scale environmental issues through the North American Environmental Atlas. http://www.cec.org/naatlas/ All North American Atlas data sets are available in three data formats: Arc/INFO Export format (e00), ArcView Shapefile and Geography Markup Language (GML). Although these data are distributed in geographic coordinates, the North American Atlas Map uses a Lambert Azimuthal Equal Area projection. The following parameters were used for the map: Longitude_of_Projection_Center: -100.00 Latitude_of_Projection_Center: 45.00 False_Easting (metres): 0.0 False_Northing (metres): 0.0 Semi-major_Axis: 6370997.0 Denominator_of_Flattening_Ratio: 1.0 Ellipsoid_Name: Sphere Units: metres Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Jorge Padilla Noriega Contact_Organization: Dirección General de Geografía, INEGI Contact_Address: Address_Type: Mailing address Address: Av Heroe de Nacozari Sur 2301 Address: Fracc Jardines del Parque City: Aguascalientes State_or_Province: Aguascalientes Country: Mexico Postal_Code: 20270 Contact_Voice_Telephone: 52 449 910 5349 Contact_Electronic_Mail_Address: email@example.com Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: John Hutchinson Contact_Address: Address_Type: Mailing address Address: USGS EROS Data Center City: Sioux Falls State_or_Province: South Dakota Country: USA Postal_Code: 57198-0001 Contact_Voice_Telephone: 605 594 6049 Contact_Facsimile_Telephone: 605 594 6529 Contact_Electronic_Mail_Address: firstname.lastname@example.org
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Time Period Information:
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Theme Keyword Thesaurus:
Theme Keyword Thesaurus:
Business and Economic
Oceans and Coasts
Place Keyword Thesaurus:
Countries > Canada
Countries > Mexico
Countries > United States Of America
Global Regions > Mid-latitude
Global Regions > Western Hemisphere
Global Regions > Northern Hemisphere
Global Regions > North America
Licensing information located at http://geogratis.ca/geogratis/en/licence.jsp
Point of Contact:
Contact Person Primary:
GeoGratis Client Services
Government of Canada, Natural Resources Canada, Earth Sciences Sector
mailing and physical
2144 King Street West, Suite 010
State or Province:
Contact Voice Telephone:
+01-819-564-5600 / 1-800-661-2638 (Canada and USA)
Where possible, attribute data were quality controlled by creatingsymbolized digital displays or hard copy plots, which were visuallyverified with digital or hard copy reference data. Attribute data thatcould not be verified in such a manner were interactively queried to checkfor anomalies such as duplication of data in fields requiring uniquevalues and incorrect feature coding. Data for areas outside of Canada,Mexico, and the United States of America are only provided for context;Natural Resources Canada, Instituto Nacional de Estadística Geografía eInformática, and the U.S. Geological Survey assume no responsibilityfor the completeness, accuracy, or presentation of this data.
Horizontal Positional Accuracy:
Horizontal Positional Accuracy Report:
Positional accuracy varies throughout the data. Positions are dependent on the accuracy of the source data and on the result of the generalization and integration processes. Data for areas outside of Canada, Mexico, and the United States of America are only provided forcon text; Natural Resources Canada, Instituto Nacional de Estadística Geografía e Informática, and the U.S. Geological Survey assume no responsibility for the completeness, accuracy, or presentation of this data.
Although these data have been processed successfully on computer systems at Natural Resources Canada, Instituto Nacional de Estadística Geografía e Informática, and the U.S. Geological Survey, no warranty expressed or implied is made by these agencies regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. No responsibility is assumed by these agencies in the use of these data.