The geographical conditions including landform, geology, drainage and existing road around the newly constructed highway, have great impact on the cost and quality of field reconnaissance. The traditional field reconnaissance way mainly depends on paper topographic map or 2D hypsographic map. There are many deficiencies, such as complicated geographic information, poor timeliness, few reference substances, difficulty in judging line position and locating. Based on automatic acquisition technology of network geographical image information, integrating the survey and design data of highway, the long and banding virtual geographical environment is established along the highway. By means of automatic generation of 3D space curve of highway and the location method of segmented coordinates of subgrade, bridge and tunnel, new constructed highway integrate smoothly into its surrounding geographical environment. Highway simulated reconnaissance method is acquired in the virtual geographical environment based on simulating site analysis and reconnaissance in the virtual environment, so that the traditional field operation of reconnaissance is changed into laboratory simulated reconnaissance. The achievement was applied in the project of highway from Yibin to Panzhihua. The results indicated: this method is featured by visualization, measuration, easiness for location and rich information expression. It can assist engineer to judge the complexity of projects and play a significant role in formulating initial construction plan, controlling the construction cost and quality.

CICTP