设为首页
加入收藏
光学像消旋系统在FY-3 MERSI图像定位中的应用
Offsetting Image Rotation System in FY-3 MERSI's Geolocation
-
摘要: 45°旋转扫描反射镜模式是一种最常见的光机扫描模式。但45°镜的旋转反射会产生像旋转, 对于线列探测器并扫成像系统时会产生轴外视场无法配准。在遥感图像地理定位计算中, 如果只考虑45°旋转扫描反射镜的反射成像, 也同样会造成地理定位结果在轴外的大误差。在遥感图像地理定位处理中, 计算了K镜反射特性矩阵, 通过光学矢量反射和旋转计算, 在图像地理定位结果中消除了轴外误差。在分析了45°旋转扫描反射镜产生像旋转原因基础上, 给出了在遥感图像地理定位中45°旋转扫描反射镜和K镜光学像消旋系统的处理方法。将该方法用于FY-3 MERSI 10元并扫探测器的遥感图像地理定位处理, 在图像定位结果中减小了误差, 地理定位结果平滑连续。并讨论了45°旋转扫描反射镜和K镜光学像消旋系统对遥感图像地理定位可能造成的其他误差。该方法同样适合于其他45°旋转扫描反射镜和K镜像消旋系统以及多元并扫遥感仪器的图像地理定位。
-
关键词:
- 45°旋转扫描反射镜;
- K镜;
- 像旋转;
- 地理定位
Abstract: 45°rotating scan mirror is one of the most popular scanning modes in optics and fine mechanics, but out-of-axis misalignment will be brought about for the multi-detector combined scanning system because image rotation is caused by 45°rotating scan mirror. In order to obtain high resolution, multi-detector or linear sensor techniques are often adopted by current remote sensing instruments. For example, Chinese Ocean Color and Temperature Scanner (COCTS) on HY-1 satellite is a four-detector combined scanning scheme, 10 detectors and 40 detectors for sampling are adopted by the Medium Resolution Spectral Imager (MERSI) on FY-3 satellite. In order to eliminate this misalignment of image rotation, K mirror is applied in COCTS and MERSI to offset image rotation from 45°rotating scan mirror. A larger out-of-axis error in geolocation of remote sensing image will also be produced if the rotation and reflection of 45°rotating scan mirror is considered only but not the K mirror.An algorithmic model in the remote sensing image's geolocation is introduced. In the model, K mirror's reflection matrix is deduced and the error in remote sensing image's geolocation has been eliminated by vector reflection and rotation. First, the cause of image rotation from 45°rotating scan mirror is analyzed, then the processing method of "45°mirror & K mirror" offsetting image rotation system in the geolocation, including building the coordinate system and calculating the reflection matrix of 45°rotating scan mirror and K mirror, is presented. This model has been applied in FY-3 MERSI's geolocation. The categories of land and water have been searched from global Land Water Mask database according to longitude and latitude. It is proved by the geolocation results that this method can offset the error of image rotation. Finally, the error resources which are produced from "45°mirror & K mirror" offsetting image rotation system in geolocation are discussed.This model is also fit for the geolocation of other remote sensors that use 45°mirror and K mirror and multiple detectors.-
Key words:
- 45°rotating scan mirror;
- K mirror;
- image rotation;
- geolocation
-
图 6 未作K镜处理的遥感图像地理定位结果
(a) 对应于遥感图像原始分辨率的水陆分类数据, (b) 图a中A区域放大, (c) 图a中B区域放大, (d) 图a中C区域放大, (e) 图a中D区域放大
Fig. 6 Geolocation result without the processing of K mirror
(a) land water mask corresponding to original remote image, (b) zoom in of district A in Fig. a, (c) zoom in of district B in Fig. a, (d) zoom in of district C in Fig. a, (e) zoom in of district D in Fig.a
图 7 经过K镜处理的遥感图像地理定位结果
(a) 对应于遥感图像原始分辨率的水陆分类数据, (b) 图a中A区域放大, (c) 图a中B区域放大, (d) 图a中C区域放大, (e) 图a中D区域放大
Fig. 7 Geolocation result with the processing of K mirror
(a) land water mask corresponding to original remote image, (b) zoom in of district A in Fig. a, (c) zoom in of district B in Fig. a, (d) zoom in of district C in Fig. a, (e) zoom in of district D in Fig. a
-
[1] Pan D. A study of anchoring geographic coordinates and calculating zenith and azimuth of sun and scanner for oceanic satellite data. Acta Oceanolodica Sinica, 1996, 15(14): 539-557. http://www.cnki.com.cn/Article/CJFDTOTAL-SEAE604.008.htm [2] Wang M. The study of NOAA AVHRR image resampling and projection methods. China Journal of Image and Graphics, 1997, 2(1): 38-42. http://www.oalib.com/paper/1636424 [3] 张幼文.红外光学工程.上海:上海科学技术出版社, 1982:223-225. [4] 刘素美, 马红章.45°旋转扫描镜多元并扫的图像畸变及软件校正.红外与激光工程, 2007, 36(4):526-529. http://www.cnki.com.cn/Article/CJFDTOTAL-HWYJ200704027.htm [5] Guo Q, Guan M. Image rotation modeling for two-dimensional plane mirror scanning and its application in precise image positioning for linear sensor imager on geostationary platform. Journal of Applied Remote Sensing, 2007, 1, 013524. doi: 10.1117/1.2775934 [6] 张锷, 龚惠兴.消除45°旋转扫描反射镜像旋转系统的研究及应用.红外与毫米波学报, 1998, 18(2):125-132. http://www.cnki.com.cn/Article/CJFDTOTAL-HWYH902.005.htm [7] 郑列华, 尹达一, 冯鑫.K镜消像旋机构在海洋卫星水色仪中的应用.红外技术, 2007, 29(1):17-21. http://www.cnki.com.cn/Article/CJFDTOTAL-HWJS200701004.htm [8] 连铜淑.反射棱镜共轭理论.北京:北京理工大学出版社, 1988:1-6. [9] 张以谟.应用光学.北京:工业出版社, 1982. [10] Nishihama M, Wolfe R E, Solomon D, et al. MODIS Level 1A Earth Location Algorithm Theoretical Basis Document Version 3.0.NASA Goddard Space Flight Center, SDST-092, 1997. [11] 惠彬, 裴云天.应用于多元探测器遥感仪的45°二维扫描镜像旋分析.红外技术, 2004, 26(3):45-48. http://www.cnki.com.cn/Article/CJFDTOTAL-HWJS200403010.htm [12] 韩心志.45°旋转反射镜扫描性质的讨论.红外与毫米波学报, 1991, 10(3):233-236. http://www.cnki.com.cn/Article/CJFDTOTAL-HWYH199103011.htm [13] 马骏.45°旋转扫描镜扫描特性分析.红外与激光工程, 1998, 27(6). [14] 史光辉.卫星对地观测高分辨率光学系统和问题.光学精密工程, 1999, 7(1):16-24. http://www.cnki.com.cn/Article/CJFDTOTAL-GXJM901.002.htm [15] http://edcdaac.usgs.gov/modis/modl2q1.asp -
下载:
图(7)
计量
- 摘要浏览量: 4133
- HTML全文浏览量: 665
- PDF下载量: 1614
- 被引次数: 0
