Calculate elevation profiles with Web Workers

Number of profiles Number of sections in profile

Start or Web Workers

Topographic map with altitude values in alpha channel

The script generates random elevation profiles from a topographic map (display:none) of the area around Innsbruck (Austria) which contains an alpha channel with elevation values. For image details, please see the SVGopen link below. The output shows minimum and maximum values found plus the time required to calculate them. You need to access the page via http:// , otherwise Firefox aborts with a security error at getImageData().