UCGIS POSTER

The UCGIS poster depicting shaded relief of the mainland United States is available for purchase. This splendid 24x36 inch poster was generated from the USGS 500meter (approximately 15 arc second) data base and is represented here as an Albers equal area conic projection. The shaded relief is represented by an exaggeration factor of 10x (necessary to distinguish surface features) with a light source angle of 45 degrees from the northwest including both ambient and diffuse lighting effects.

The colors representing shaded relief in the poster define fifteen gradations where the hue of the image is adjusted to enhance the elevation change. The highest elevations are saturated as red, transitioning through orange to green, and finally to the lowest elevations depicted by dark green. An iterative process adjusted both image brightness and contrast to construct the final 24 bit product. The final 325MB digital file was transferred directly to the printer where negatives and plates were produced. Subtle color adjustments in the ink proportions in different regions of the print were made while the press was running.

Three entities collaborated on this project: the Cartography Laboratory at the University of Colorado (Boulder), Computer Terrain Mapping, Inc. (Boulder), and the AEGIS Laboratory at the University of California (Berkeley).

How to order the UCGIS poster

To purchase a copy send a $14. check or money order (made payable to UCGIS) to:

UCGIS POSTER
c/o Susan McDonald Jampoler
Executive Director UCGIS
43351 Spinks Ferry Rd.
Leesburg, VA 20176-5631

This amount includes the $10 cost of the poster, a shipping tube and regular Parcel Post. Add $2 for Priority mail or $11 for overnight shipping.

Last updated on July 4, 2000.