Feature N :0 09 E :0 10:0 0 0 11:00 12:00 00 05: 0 :0 06 :00 07 08 0 19: 18 00 17 :00 :0 0 December 22 January February March :00 16 :00 15 0 14:0 13:00 W April May June June 22 S A sunmap for 45 degrees North latitude is calculated from the winter solstice (December 21) to summer solstice (June 21). The sunmap is further overlaid with the calculated viewshed to calculate the direct solar radiation. N E W S A skymap with sky sectors defined by 8 zenith divisions and 16 azimuth divisions. Each color represents a sky sector, or portion of the sky, from which diffuse radiation originates. The sunmap is further overlaid with the calculated viewshed to calculate the direct solar radiation. For More Information Visit www.esri.com/training to learn more about these Esri courses: n Learning ArcGIS Spatial Analyst, a Web course n Working with ArcGIS Spatial Analyst, an instructor-led course n Working with ArcGIS Spatial Analyst for Geospatial Intelligence, an instructor-led course n Advanced Analysis with ArcGIS, an instructor-led course www.esri.com ArcUser Spring 2009 29