Historical Trends in Sailplane Activity at Hemet-Ryan Airport

In support of our negotiations with the County of Riverside regarding soaring at Hemet-Ryan Airport, I have conducted a study of the number of sailplanes based there from 1996 through 2009. The source of data for the study was historical images from Google Earth: I counted the gliders, hangars, and trailers in each image and did some analysis and graphs. The study is available here.