Map Projections
National Maps
We used several
different map projections to produce the U.S. maps in this publication.
For the contiguous United States, an Albers Conic Equal Area projection
was used. For Alaska, the Miller's Cylindrical projection was used, and
the Hawaii map uses geographic coordinates (latitude and longitude).
Neither Alaska nor Hawaii is in proper geographic scale relative to the
continental United States on the national maps. The combination of
different projections and scales allowed for presentation of a relatively
familiar orientation of these geographic features. The coordinate
information for the contiguous 48 states was projected using the Albers
Conic Equal Area projection with the following parameters:
| Spheroid:
Clarke 1866 |
Central
Meridian: -96.000 |
| 1st
Standard Parallel: 29.500 |
2nd
Standard Parallel: 45.500 |
| False
Easting: 0.000 |
False Northing: 0.000 |
| Reference
Latitude: 37.500 |
|
The coordinate
information for Alaska has been projected using the Miller Cylindrical
project with the following parameters:
| Spheroid:
Sphere |
Central
Meridian: 0.000 |
State Maps
All state maps were
projected using the State Plane coordinate system. Each state map is
presented at a size designed to maximize the reader's ability to
interpret the data. Thus, the maps are not in accurate geographic scale
relative to one another. Because State Plane systems are commonly used by
state agencies, their use here maximizes the reader's ability to compare
these maps with information from other sources.
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Date last reviewed:
05/12/2006
Content source: Division for Heart Disease and Stroke
Prevention,
National Center for Chronic Disease Prevention and
Health Promotion |
