http://www.wimsey.com/PhotoModeler/3dMeas/3dtofc.html
If you are working on, or interested in, making 3D measurements of real world objects, this Web site will keep your attention. The page covers a wide range of topics related to 3D measurement ranging from terminology and technology, to how measure a long list of example items and categories. The page is helpful and informative, and is produced by a company producing a program to extract 3D models out of photographs.