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Track: Cartography and Map Production
Kent Lethcoe
U.S. Geological Survey
Science and Applications Branch
Sioux Falls, SD 57198
Telephone: 605-594-6502
Fax: 605-594-6150
E-mail: lethcoe@edcmail.cr.usgs.gov1101
Robert Klaver
Using the Interrupted Goode Homolosine Projection
The Interrupted Goode Homolosine map projection is a pseudo cylindrical equal area map projection designed to present the entire world on the same map. This projection features the presentation of the global land masses with minimal interruption and minimal overall angular distortion. Vector and raster data in the Interrupted Goode Homolosine map projection are available to the spatial data community through the USGS EROS Data Center. Data sets that use or will use the Interrupted Goode Homolosine projection include the one kilometer Advanced Very High Resolution Radiometer (AVHRR) imagery of the world land masses, a corresponding land/water mask generated from World Vector Shoreline and Digital Chart of the World Drainage layer sources, the GTOPO30 digital elevation data set, MODUS, and the SPOT Vegetation data set. The Interrupted Goode Homolosine map projection is divided into twelve discrete regions that form six interrupted lobes. The two northern regions may be presented with some land areas
repeated in both regions to show the northern land masses without interruption. The Interrupted Goode Homolosine map projection is not directly supported in ArcInfo. Fortunately, the twelve discrete regions can be formed from instances of the Mollweide and sinusoidal map projections, which are both supported projections in ArcInfo. Data can be projected into the Interrupted Goode Homolosine projection by splitting it into regions corresponding to the twelve Goode regions, projecting the separate regions according to the appropriate projection and offset, and joining the projected regions into one coverage. Data can be projected out of the Interrupted Goode Homolosine projection by splitting it according to the twelve Goode regions, projecting it from each region's Goode component projection to the required output projection, and joining the desired regions in the output projection. This paper demonstrates the projection of data into and out of the Interrupted Goode Homolosine projection using AMLs.
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