论文部分内容阅读
MWRI(MicroWave Radiation Imager) is one of the payloads on our next generation polar meteorological satellite FY-3.MWRI conically scans with a fixed incident angle on the earth surface.It is the first time for Chinese remote sensor to use this scan mode.In this work,we present a geolocation method for FY-3 MWRI’s remote sensing image based on its special scan geometry.The integrated coordinate systems and the specific relationships with these coordinate systems are defined.A spatial relationship model between the remote sensing data and the earth-based coordinate system is established.This method also in-cludes an algorithm of satellite orbit computation,which is used to get the satellite’s instantaneous velocity vector from its posi-tion.This method has been applied to MWRI’s remote sensing image geolocation.The results show that the accuracy of this method can achieve 1 pixel.The 33 GCPs(Ground Control Points) which are in the regiones of FY-3 MWRI’s observation have been collected and used to analyze the precision of the geolocation.By statistical analysis,the error along-track is about 1.5km,and the error along-scan is about 3.0km.It is obvious that this method fulfills the requirement of precision for FY-3 MWRI whose space resolution exceeds 5km.
MWRI (MicroWave Radiation Imager) is one of the payloads on our next generation polar meteorological satellite FY-3.MWRI conically scans with a fixed incident angle on the earth surface. It is the first time for Chinese remote sensor to use this scan mode. In this work, we present a geolocation method for FY-3 MWRI’s remote sensing image based on its special scan geometry. The integrated coordinate systems and the specific relationships with these coordinate systems are defined. A spatial relationship model between the remote sensing data and the earth-based coordinate system is established. This method also in-cludes an algorithm of satellite orbit computation, which is used to get the satellite’s instantaneous velocity vector from its posi- tion. This method has been applied to MWRI’s remote sensing image geolocation. results show that the accuracy of this method can achieve 1 pixel. The 33 GCPs (Ground Control Points) which are in the regiones of FY-3 MWRI’s observation have been collected a nd used to analyze the precision of the geolocation.By statistical analysis, the error along-track is about 1.5km, and the error along-scan is about 3.0km.It is obvious that this method fulfills the requirement of precision for FY-3 MWRI whose space resolution exceeds 5km.