DATA PROCESSING TECHNOLOGY OF AIRBORNE 3D IMAGE

Airborne 3D image which integrates GPS,attitude measurement unit (AMU),scanning laser rangefinder (SLR) and spectral scanner has been developed successfully.The spectral scanner and SLR use the same optical system which ensures laser point to match pixel seamlessly.The distinctive advantage of 3D image is that it can produce geo_referenced images and DSM (digital surface models) images without any ground control points (GCPs).It is no longer necessary to survey GCPs and with some softwares the data can be processed and produce digital surface models (DSM) and geo_referenced images in quasi_real_time,therefore,the efficiency of 3D image is 10～100 times higher than that of traditional approaches.The processing procedure involves decomposing and checking the raw data,processing GPS data,calculating the positions of laser sample points,producing geo_referenced image,producing DSM and mosaicing strips. The principle of 3D image is first introduced in this paper,and then we focus on the fast processing technique and algorithm.The flight tests and processed results show that the processing technique is feasible and can meet the requirement of quasi_real_time applications.