This summer, with assistance from two collaborators, I have created a Google Earth kml file with 1,884 ski resorts around the world pinned.
Free download here:
download: World Ski Map for Google Earth (192.85KB) clicks: 5377
clicks: 5377 Download this file to display the locations of nearly 2,000 worldwide ski and snowboard areas in Google Earth. (Formerly Ski Map North America, this was expanded to worldwide coverage in Sept. 2015.)
I don't know the exact number of the 1884 resorts that are in the Alps, but a similar 600-700 is the likely number. The Alps were the most time consuming part of this project. My objective was to put the pin in actual ski terrain (vs. at town or resort level), and when the terrain is far above tree line it can take some time to find. Marmota's map has the attractive feature of outlining the ski terrain, so it's easy to see the scale of the ski area and what's interconnected. My pins will make it easy to see nearby lifts, trail cuts, but you need to explore around a bit, perhaps with the aid of an online trail map to determine the overall scale of a resort. For vast complexes I put in multiple pins to aid this process.
The interactive features of Google Earth provide some advantages over a conventional flat map in getting the feel for a ski resort.
1) The exact altitude of your mouse pointer is shown at the bottom of the map. By moving it from top to bottom of lifts and trails, you can learn the altitude range of selected sectors of a resort as well as the overall published stats.
2) Tilting the map to a more 3-D view shows you steepness/flatness of topography.
3) Tilting the map to 3-D view and noting the compass at upper right in Google Earth shows you the direction of exposure of ski slopes. This is particularly useful in the Alps, where resorts are so far flung that a 2-dimensional trail map is often used to represent multiple exposures so very difficult to figure our on your own any other way.
I sent Dustyfog a copy of this map while in development this summer.