So this article introduces a kind of reasonable computing model, and applies it to calculating the sight distance that provided by crest vertical curves, moreover integrates it and method of PVSD to specify from quantity the principle of combining plane and vertical curves which belong to the freeway of plain district.

The evaluation indexes of psychological and physiological burden degrees are established based on experiment and statistics method by research sight distance on single curve.

In the aspects of viewshed,and the view distance as well as psychological experience of the viewer,the paper analyzed comparatively the changes in the landscape visual features of the comprehensive natural lands.

By means of deciding view angle α, the view distance d is controlled, the vanishing points are adjusted and the view points is got automatically.

Visual range prediction for thermal imaging system by different static performance models;

Based on the static performance of thermal imaging systems , a mathematical model for the visual range prediction adaptal for extended source target is studied.

Based upon the signal to noise ratio of the image and static performance of thermal imaging systems, the effect of scene radiant characteristics to the visual range prediction of thermal imaging systems is studied in the prisent paper.