京津冀地区高分一号宽覆盖正射影像生成

Ortho-rectification of GF-1 WFV Images in Beijing-Tianjin-Hebei Region

针对高分一号宽覆盖1A级影像的大区域正射影像生成后,相邻影像接边精度不高的问题,提出利用数字高程模型(DEM)作为高程约束的平面区域网平差方法提高其对地目标定位精度。通过京津冀地区的高分一号宽覆盖影像的平面区域网平差并进行正射纠正试验,在GOTOPO30 DEM的支持下,采用的区域正射纠正方法和处理流程取得了较好的效果。

In response to the problem that edge matching accuracy is low when satellite images of GF-1 WFV(Wide Field View) level 1A are ortho-rectii ed one by one in large area, this paper proposed a plane block adjustment method that utilizing DEM as height constraint plane block adjustment method to improve the targeting precision of images.First, Rational Function Model(RFM) with affine transformation was selected as the mathematical model of the satellite image plane block adjustment. Second, to update the ground coordinates of Tie Points(TPs), the plane coordinates of TPs were only solved in the adjustment process. Elevation values were obtained using DEM interpolation.Finally, ortho-rectification was carried out using orientation parameters solved by plane adjustment. GF-1 WFV images in Beijing-Tianjin-Hebei Region were tested for plane block adjustment and ortho-rectification.Ultimately, the test results proved the effectiveness and feasibility of the plane block adjustment and ortho-rectification method by the support of GOTOPO30 DEM.