关于卫星影像多项式法纠正中若干问题的分析

Analysis on Some Problems in Quadratic Polynomial Retific ation of Satellite Image

摘要:

二次多项式方法在卫星影像纠正处理过程中已得到广泛应用。纠正影像的精度取决于控制点的数量与分布状况,根据经验,在一景卫片上一般选取25～30个均匀分布的控制点即可满足影像平面精度的要求。多景影像拼接涉及到无缝镶嵌问题;应用ERDASIMAGINE将多景已纠影像拼接为一体,作为Photoshop的背景影像,应用Photoshop的图像编辑与处理功能修改存在误差的线状地物影像,可实现影像无缝镶嵌。评定纠正影像的平面精度一般采用3种方法:一是精度估算;二是对照参考图量测同名点误差、计算平面精度;三是测算接边精度。

Abstract:

Quadratic polynomial method has been applied widely in satellite image retification. Precision of corrective image is decided by amoun ts and distribution of reference points. According to experience, if 25 to 30 re ference points which are evenly distributed on one satellite image are selected, plane precision demand can be satisfied. Sometimes, one satellite-image is not satisfied with practical application,it deals with the question of naught-sew m osaic for satellite-image;by using ERDAS IMAGINE, several satellite-images are connected as a whole which can be regarded as background image for Photoshop. By using the function of image editor and disposal on photoshop to amend line imag es with errors, naught-sew mosaic can be realized. Three methods are generally u sed to evaluate plane precision of corrective image: precision appraision, cal culating plane precision with homonymy-point error on reference map and measurin g mosaic precision.