Contact: Martha Raynolds Alaska Geobotany Center Research Associate fnmkr@uaf.edu tel: 907.474.6720 Files: swi82-03final.img swi82-03final.img.xml ERDAS Imagine image file and XML metadata exported from ArcGIS. Summary: Mean Summer Warmth Index (SWI) of polar area. Final dataset used for the analysis in Raynolds, et al. (2008). The grid values are the means of Summer Warmth Index for 1982-2003. Summer warmth index is calculated as the sum of the monthly means above 0 degrees C. Monthly temperature means for May, June, July, August and September were evaluated for inclusion in the Summer Warmth Index. The units are summed degrees C > 0. References: Raynolds, M. K., Comiso, J. C., Walker, D. A., and Verbyla, D. 2008. Relationship between satellite-derived land surface temperatures, arctic vegetation types, and NDVI. Remote Sensing of Environment 112: 1184-1894.