In combination with project examination of Chongqing,this paper introduces the process of producing 1 ∶500 topographical map of hill area with low-altitude photographic digital images,some technical problems,solutions and suggestions during the production.

This paper presents a summary of digital image and digital imaging technology.

It was a conclusive fact that digital technology already came into the execution ground, The quality of the digital image is totally suitable for the request for photography on crime, the evidential function of the digital image is indubitable too.

The experiment and study on the digital video of the GPS design;

The research of draw contour by the general digital image to making use of the DLT algorithm;

Parallel processing of mass aerial digital images based on cluster computer——The application of parallel computing in aerial digital photogrammetry;

Originated from the understanding of image, the article introduces the traditional silvered plate photography and modern digitized photography and its flow.