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Remote Sensing for Land & Resources    2018, Vol. 30 Issue (2) : 53-59     DOI: 10.6046/gtzyyg.2018.02.07
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PALSAR-2 image ortho-rectification based on orbit parameters modulation
Yanyan LI1,2(), Ping TANG1(), Changmiao HU1, Xiaojun SHAN1
1.Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100101, China
2.University of Chinese Academy of Sciences, Beijing 100049, China
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Abstract  

Evaluation the application potential of the new generation L-band sensor by ortho-rectifying of the PALSAR-2 image has an important significance. The error of orbital parameter in the rectification process will affect the final ortho-rectification precision. To tackle this problem, this paper proposes an ortho-rectification algorithm for PALSAR-2 image based on orbit parameters modulation and simplified calculation. Orbit parameters are modulated by registration of the simulate image and the real image. By using the modulated orbit parameters and simplified calculation of the range doppler(RD) model, ortho-rectification is performed. The method was applied to PALSAR-2 image and PALSAR image at the same time and it was compared with the PALSAR-2 ortho-rectification image without orbit parameters modulation. The result shows that the algorithm has strong operability and high geometric accuracy and that the new generation L-band sensor image’s rectification accuracy is higher, which further confirms that the new generation L-band sensor has better performance and greater application potential.
Keywords RD model      orbit parameter      ortho rectification      PALSAR-2     
:  TP79  
Corresponding Authors: Ping TANG     E-mail: liyy@radi.ac.cn;tangping@radi.ac.cn
Issue Date: 30 May 2018
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Yanyan LI
Ping TANG
Changmiao HU
Xiaojun SHAN
Cite this article:   
Yanyan LI,Ping TANG,Changmiao HU, et al. PALSAR-2 image ortho-rectification based on orbit parameters modulation[J]. Remote Sensing for Land & Resources, 2018, 30(2): 53-59.
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https://www.gtzyyg.com/EN/10.6046/gtzyyg.2018.02.07     OR     https://www.gtzyyg.com/EN/Y2018/V30/I2/53
Fig.1  Image point displacement
Fig.2  Flow chart of PALSAR-2 ortho-rectification
参数 ALOS-2 PALSAR-2 ALOS PALSAR
拍摄时间 2014-10-26,升轨 2010-12-16,升轨
中心经纬度/(°) E138.716,N35.579 E138.705,N35.803
载波频率/GHz 1.236 1.270
天底偏角/(°) 28 43.4
入射角/(°) 31.1 49.645
极化方式 全极化 HH
PRF 2 320.863 848.896
近地点斜距/km 719.291 987.469
参考坐标系统 ECR ECR
Tab.1  Brief introduction of the images in study area
Fig.3  PALSAR-2 image
Fig.4  DEM image
Fig.5  PALSAR-2 simulate image
Fig.6  PALSAR-2 ortho-rectification image
Fig.7  PALSAR rectification image
Fig.8  PALSAR-2 ortho-rectification image without orbit parameters modulation
点号 实际坐标 PALSAR -2校正影像 未经轨道修正的PALSAR -2校正影像
校正坐标 坐标差 校正坐标 坐标差
x y x y Δx Δy x y Δx Δy
1 301 470 3 920 022 301 461 3 920 021 9 1 301 459 3 920 028 11 6
2 299 655 3 921 460 299 649 3 921 451 6 9 299 647 3 921 451 8 9
3 297 900 3 904 394 297 898 3 904 392 2 2 297 890 3 904 382 10 12
4 289 693 3 931 157 289 686 3 931 150 7 7 289 686 3 931 141 7 16
5 289 290 3 931 063 289 293 3 931 065 3 2 289 299 3 931 066 9 3
6 288 781 3 930 926 288 776 3 930 929 5 3 288 766 3 930 914 15 12
7 288 387 3 930 908 288 385 3 930 899 2 9 288 383 3 930 899 4 9
8 283 306 3 929 923 283 293 3 929 922 13 1 283 293 3 929 910 13 13
9 283 238 3 930 228 283 234 3 930 221 4 7 283 234 3 930 221 4 7
10 281 628 3 928 258 281 626 3 928 266 2 8 281 620 3 928 266 8 8
11 277 290 3 909 780 277 283 3 909 787 7 7 277 272 3 909 787 18 7
12 274 895 3 934 615 274 889 3 934 618 6 3 274 889 3 934 625 6 10
13 269 652 3 932 515 269 653 3 932 514 1 1 269 659 3 932 503 7 12
14 267 860 3 927 380 267 852 3 927 384 8 4 267 845 3 927 384 15 4
15 267 434 3 924 644 267 437 3 924 652 3 8 267 437 3 924 652 3 8
Tab.2  Accuracy assessment of PALSAR -2 rectification images with orbit modulation and without orbit modulation(m)
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