Abstract
The graphical methods developed at the War Officeof mapping from strips of vertical photographs are generally widely known. It may be fairly said that they frequently present a reasonably economical method of mapping the planimetry of a country on medium topographical scales when there is a normal third-ordertrigonometrical control, but that so far it has not been possible to provide economically for the accurate depiction of the ground relief. The reason, for this failure is due to the fact that the control required fot contouring is about one fixed height per square inch of map, and the cost of providing this control will normally be of the same order as the cost of mapping by ground methods.
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