基于WorldView卫星影像的海岛测图精度控制分析

根据WorldView卫星影像的特点,分析其原始定位精度,并结合海岛测区的地形地貌特点,应用稀少控制卫星影像航天摄影测量平差方法,合理地进行控制点布设,同时有效控制外推岛屿的定位精度。对于独立海岛进行无控自由网平差,并量测一定数量的海岸水位点作为高程点,进行模型置平作业。通过比对实测瞬时水涯线,检查、检测其海岸线高程精度。最终保证数字空中三角测量的成果满足海岛(礁)测图卫星影像成图区的成果精度要求。

Accuracy Control Analysis in Island Mapping Based on WorldView Satellite Images

By analyzing the original positioning accuracy of WorldView images, concerning the terrain feature of island areas,and based on consummation of errors in GCP scarce regions, this article develops a method to reasonably distribute control points and effectively control allocation accuracy of expanded islands. The non-control free network adjustment is used for independent islands,and some coastline points are measured as elevation points to level the model. The coastline elevation accuracy of independent islands is tested by comparing the measured instant waterlines. Finally, triangulation products precision meets the criteria of island mapping engineering.