The old cadastral maps present the geographic form of the divided land and record relevant information about them. These maps were usually depicted on A4 or A3 size papers, and only show cadastral information, related to the blocks of small towns. In recent times, many countries in the world have, in implementation of cadastral plans, produced new cadastral maps, and, based on multiple purposes, use the scale of 1: 1000, 1: 2000 and 1: 2500. Japan, for example, has set a new cadastral map scale of 1: 2,500. (iaoyong C, 1999)
Rebuilding and editing old cadastre to be prepared for adding new cadastral plan requires generalization operation and editing process. Here, we present an algorithm for automatic generalization of old cadastral maps based on comparative drawing, and by mentioning a practical example, the efficiency of the algorithm is determined.