基于RPC模型的IRS-P5影像正射校正

王红平; 刘修国; 罗红霞; 成晓英

doi:10.3799/dqkx.2010.061

基于RPC模型的IRS-P5影像正射校正

doi: 10.3799/dqkx.2010.061

王红平^{1, 2,},
刘修国^{1, 2},
罗红霞^{1, 2},
成晓英^{1, 2}

1.
中国地质大学信息工程学院，湖北武汉 430074
2.
地理信息系统软件及其应用教育部工程中心，湖北武汉 430074

基金项目:

国家重点“863”项目 2007AA120503

教育部2007年“新世纪”优秀人才支持计划 NCET-07-0772

详细信息

作者简介:
王红平(1979-)，男，博士生，主要从事遥感图像处理方面的教学与科研工作.E-mail: cugwhp@126.com

中图分类号: TP79
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- 被引次数: 0
出版历程
- 收稿日期: 2010-01-15
- 刊出日期: 2010-05-01

IRS-P5 Satellite Image Ortho Corrections Using RPC Model

WANG Hong-ping^{1, 2
,},
LIU Xiu-guo^{1, 2},
LUO Hong-xia^{1, 2},
CHENG Xiao-ying^{1, 2}

1.
Faculty of Information Engineering, China University of Geosciences, Wuhan 430074, China
2.
Engineering Research Center for GIS Software and Applications, Ministry of Education, Wuhan 430074, China

摘要

摘要: 为了提高有理函数(rational polynomial coefficient，RPC)模型校正模型的定位精度，以IRS-P5为例，通过控制点及补偿模型的添加，比较分析了影像正射校正的精度变化.发现使用1个控制点比不使用控制点，其校正精度从55.80 m提高到5.80 m；当控制点数达到6个时，其定位精度接近于5.0 m，之后影像定位精度便不会再随控制点数的增加而提高；使用1个控制点和补偿模型，可将定位精度提高到4.0 m左右.实验表明：可通过添加少量控制点提高RPC模型的正射校正精度，在缺少控制点的情况下，使用补偿模型亦能使RPC模型达到相当的影像校正精度.
- 正射校正 /
- RPC模型 /
- IRS-P5 /
- 卫星影像
Abstract: Optimizing the RPC (Rational Polynomial Coefficient) model can improve the positioning accuracy of the RPC correction model. Tacking an IRS-P5 image for example, in the cases of using 0-9 control points or using compensation model, we analyze the accuracy change of the image ortho correction. The results show that the accuracy can be improved from 55.80 m to 5.80 m when we increase the control points from 0 to 1; while the accuracy is close to 5.0 m when the number of control points is more than 5; In addition, the accuracy reach 4.0 m when we use 1 control point and compensation model. It indicates that the accuracy of ortho correction of RPC modal can substantially increase by adding control points, also can reach high correction accuracy using compensation model in the cases of missing control point.
- ortho correction /
- RPC model /
- IRS-P5 /
- satellite image

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图 1 (a) IRS-P5原始影像和(b)SPOT-5参考影像

Fig. 1. (a) original IRS-P5 image and (b) reference SPOT-5 image

下载: 全尺寸图片幻灯片

图 2 DEM数据

Fig. 2. DEM data

下载: 全尺寸图片幻灯片

图 3 检查点(利用控制点实验)均差精度曲线

Fig. 3. Equal error accuracy curve of check points (using control points)

下载: 全尺寸图片幻灯片

表 1 RPC模型参数形式

Table 1. Format of RPC model paramter

形式	分母	阶数	RPC参数数目	最小控制点数
1		1	14	7
2	P_X≠P_Y	2	38	19
3		3	78	39
4		1	11	6
5	P_X=P_Y≠1	2	29	15
6		3	59	30
7		1	8	4
8	P_X=P_Y=1	2	20	10
9		3	40	20

下载: 导出CSV

表 2 无控制点的正射校正地面精度(m)

Table 2. Ground accuracy of ortho correction without control point

	X方向	Y方向	Z方向
最大残差	-53.60	-27.52	60.25
最小残差	-39.56	-29.90	49.59
中误差	46.00	31.60	55.80

下载: 导出CSV

表 3 仿射变换模型的正射校正地面精度(m)

Table 3. Ground accuracy of ortho correction with affine transformation model

	X方向	Y方向	Z方向
最大残差	-7.60	4.07	8.62
最小残差	-0.92	-0.35	0.98
中误差	3.53	2.06	4.09

下载: 导出CSV

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