基于水边线等高的海岸带卫星影像定位方法

A Mothod for Positioning Coastal Zone Satellite Imagery Based on Water Edge Contours

针对海岸带和海岛(礁)稀少地面控制区域控制条件不足和定位精度较低等情况,将水边线等高条件与有理函数模型(RFM)相结合,充分利用海岸带卫星影像的特点,将水边线等高点引入平差,提出了一种基于水边线等高的海岸带稀少地面控制卫星影像定位方法。实验结果表明,在同样稀少地面控制情况下,该方法与未加入等高控制条件的海岸带卫星影像定位方法相比,高程定位精度有了明显的提高;在离海岛较近的大陆岸边布设控制点,利用本文方法同样可以在海岛获取较高的定位精度。这对于稀少地面控制条件下海岸带、海岛(礁)地理信息的精确获取,具有重要意义。

Aimed at these conditions such as low positioning accuracy and inadequate control in coastal zones and islands （reefs） with sparse ground control, water edge contours are combined with the Rational Function Model （RFM） in this paper.To make full use of the characteristics of coastal zone satellite imagery, water edge contour condition is introduced into the adjustment and a method of sparse ground control satellite image positioning based on water edge contour is proposed.Experimental results demonstrate that elevation positioning accuracy is increased significantly while water edge contour condition is introduced into adjustment, compared with the traditional positioning method.What’ s more,the same accuracy can be obtained in islands while control points are set on the shore close to the islands.It’ s significant for accurately obtaining geographic information in coastal zones and islands （reefs） with sparse ground control.