Time鄄series remote sensing data can provide vegetation information in different stages in one growing period, which is very helpful for the understanding of the dynamic of land cover. As the basic data source of ChinaCover, the multi鄄 spectral CCD images of HJ constellation have the same 30m spatial resolution and visible to near infrared band as other earth resource satellite. It can provide 2 days temporal resolution for there are two satellites named HJ鄄 1A and HJ鄄 1B with 180 degree phase differences and each satellite has 4 days temporal resolution. It is an important data source for the ecological land cover classification and eco鄄parameter inversion. However, incorrect geolocation caused by the satellite motion along the roll, pitch, yaw direction and the pixel displacement caused by the topographical variations at the off鄄nadir viewing angle are the bottlenecks when using the massive amount of HJ data. High precision space coordinates is the basic information to guarantee the information extraction, geostatistics analysis and to combine images with other geographic information. The geo鄄registration and orthorectification is the first issue facing in the pre鄄processing procedure for the remote
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