Journal:Journal of Remote Sensing

Key Words:Aerial Photogrammetry; China Earthquake Rescue; Fast Response; DPGrid

Abstract:The aerial photogrammetry not only can provide the high resolution ortho image, the accurate Digital Elevation Model and the 3D Landscape Map, but also can provide all kinds of accurate and visualized measuring tools for the fast response to the disaster rescue. These applications of aerial photogrammetry can help the breakdown gang design the effective rescue plan and dispatch salvagers rationally shortly after the disaster. But in the emergency response, the aerial images can not be taken according to the conventional aerial photography in the limited time. That means the airplane should fly along the main traffic lines, e.g. roads, rivers and bridges, and when the airplane fly above the county it will circles around in the air to acquire the detail information of the county. At the same time, although there were POS (GPS/IMU) data, because there were no reference stations for GPS and ground control points for calibrating the POS system at emergency time, the precision of POS is very low. So for the disaster rescue, it is very important to process the mass unconventional aerial images accurately and quickly in a highly efficient method. DPGrid is the aerial photogrammetry software developed by Wuhan University. It utilizes the blade severs as the computing nodes and applies the robust arithmetic and parallel computing to realize the mass aerial image data quick processing. In the China Earthquake Rescue DPGrid processed 4393 unconventional aerial photography DMC images in 111 hours and provided many timely and accurate surveying and mapping products for the rescue organization. The paper introduces the applications of aerial photogrammetry in the emergency response through discussing the method of how DPGrid processed the mass aerial images in China Earthquake Rescue, and the main content includes: the architecture of DPGrid; the robust stereo image matching for the images with large rotation angle; the bundle adjustment with POS but without ground control points for removing the POS relative error; the parallel computing of generating ortho image and the production efficiency of DPGrid. The paper also shows readers some aerial photogrammetry products and applications in the Emergency Response, such as: The operator can measure the length of broken bridges on ortho images, measure the area and earth volume of landslide mass on ortho image superposed with DEM, and can roam and measure 3D coordinates in the virtual 3D environment, etc. The aerial photogrammetry has provided many visualized, accurate and valuable surveying data for the China Earthquake Rescue, and showed its important role in the emergency response. But how to perfect the aerial photogrammetry emergency response mechanism and let it become an important part of the National Emergency Response Mechanism is the duty and incumbency of all surveying workers.

Co-author:Dahai Guo,Tao Ke,Jianchao Wang

First Author:Zuxun Zhang

Translation or Not:no

Date of Publication:2008-11-30