During the course of changing film theodolite survey information into numeral pictures

if the optical survey films are transformed into the bitmap directly

the data will become larger

which will hinder transmission and storage. If the data are compressed

the precision of judging the position of the object will be reduced. This paper adopts picture-handling technology

according to the information recording principles of optical survey film

and the concrete demands of data processing. It designs a new method which can divide the film pictures into different areas

realize direct storage of the areas affecting precision

conduct compression in other areas

and maintain the relative position of different areas to the cross. The goal is for these areas to compose properly when the pictures are restored. The method reduces the data

assures the precision of data

realizes the number of optical survey films and also solves the serious problem of information storage and transmission of optical theodolite survey information.