利用空三定位网进行光学卫星影像几何定位
Geopositioning for Optical Satellite Images Using Spatial Triangulated Network
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摘要: 根据卫星重复观测特性提出区域级空三定位网的概念,存储该地区空三成果。新获取影像与空三定位网进行联合区域网平差,实现无(稀少)控制下影像高精度几何定位。与常规区域网平差方法相比,利用空三定位网进行无控制点影像定位精度有所提高;若与常规平差方法达到相同精度,利用空三定位网需要较少控制点。定位网中影像数量、分辨率高于新获取影像,或与新影像有较高重叠度情况下定位结果较高。实际应用中,将某一区域高分影像空三成果存储构成空三定位网,对新影像进行无控(稀少控制)定位,将会提高影像实时化几何处理效率与影像利用率,为影像几何定位提供了另一有效途径。Abstract: Regionalspatialtriangulatednetworkmanagingtheoutcomeofspatialtriangulationisraisedinthispaperonthebasisofrepeatedobservationofsatellites.Combinedblockadjustmentwithnon o rientednewimagesandspatialtriangulatednetworkisexecutedforpositioningwithsparse(no)groundcontrolpoints(GCPs).TestresultsshowthatspatialtriangulatednetworkcanachievehigheraccuracywithoutGCPsandneedsfewerGCPstogetthesameaccuracythantheconventionalmethod.Thehigheraccuracycanbeachievedwhenthenumberofimagesinthenetworkismoreandresolutionhigherthanthenewimagesandalsotheyhavehigheroverlaps,Inapplication,usingspatialtriangula tednetworkwillimprovethetimelyefficiencyofgeometryprocessingofsatelliteimagesandimagesutilization,whichprovidesanothereffectivewaytoimagegeometricpositioning.
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