Drawing technique used in “Zigezyôsin” Usa-village map drawn in 1750 was analyzed by investigating azimuth, scale denominator and treatments of similar triangles in the map using newly developed method. When Usa-village was surveyed, it is estimated that the surveyors obtained highly accurate survey data and drew a survey map. Then they divided this map into component parts such as similar triangles or azimuth lines. Finally, by reconstructing these parts adding to each of them different operation of rotation and of expansion or reduction, they fitted the survey results to the given village borders and drew a new map. With this technique, they connected the Usa-village map with the neighbor village maps, like a jigsaw puzzle.
