关键词: IKONOS影像, 城市防震减灾, 震害评价

Abstract: IKONOS satellite launched in 1999 is one of the commercial satellites with highest spatial resolution, which has five spectral bands including red, green, blue, near-infrared and pan. The maximum spatial resolution of IKONOS is 1 meter. From the imagery, researchers can easily identify the basic elements needed for earthquake hazard reduction business in urban areas, such as buildings, structure, roads and bridges. With the aid of computer, a great amount of information including the shape, position and attribute of ground objects can be automatically or semi-automatically extracted from IKONOS digital imagery by using the remote sensing imagery processing software. In this way, lots of manpower and finance can be saved. Because the renewal of IKONOS imagery is faster than aerial photos or large-scale maps that are used for urban earthquake hazard assessment, the latest information can be ensured. It is very useful for solving the aging of data for the Ninth Five Year Project on the Research of Seismic Hazard Assessment and Disaster Prevention and Mitigation. The repetition interval of IKONOS imagery is about 3 days, so the imagery can be applied to the rapid assessment of earthquake disasters. Under ideal weather condition, users can get IKONOS imagery of earthquake-stricken area within 3 days (even several hours) when an earthquake occurs. Owing to the high resolution of IKONOS, researchers can use it for earthquake site investigation instead of aerial photos. Remote sensing imagery including IKONOS is in digital format, and thus it can be easily processed and analyzed by computer, so that it is convenient for the computer-aided assessment and emergence decision of earthquake disaster. The methodological feasibility of IKONOS application to earthquake disaster is discussed in this paper. It is concluded that the high-resolution satellite imagery including IKONOS has the broad prospects in obtaining and renewing the basic data of urban areas, as well as in the rapid assessment and emergence decision of earthquake disaster.

Key words: IKONOS imagery, earthquake hazard reduction, application