Calibration and Validation of ZY-3 Optical Sensors

Abstract

As the first Chinese civilian high-resolution remotesensing satellite, Ziyuan 3 (ZY-3) is equipped with nadir, forward, and backward cameras for stereo mapping. In order to acquire high-resolution mapping accuracy, in-orbit sensor calibration is a particularly crucial procedure after the satellite is launched and orbiting. The key problem of in-orbit sensor calibration is analyzed based on the overall structural design and imaging geometric characteristics of ZY-3. In this paper, a rigorous imaging model of ZY-3 and an interior orientation model are established based on the satellite's designed configuration, charge-coupled device splicing, and imaging characteristics. A new trajectory model, which is called the exterior orientation model, is proposed, which establishes a systematic-error model for the sensors of ZY-3. In addition, the 609th track data are used to validate the new trajectory model, a piece point with a weight polynomial model, which is compared with other trajectory models. Furthermore, different ground control points are selected for the bundle block adjustment experiments with the systematic error and trajectory models of the proposed sensor. It is observed by experiment that the piece point with weight polynomial model has a higher orbit and attitude interpolation accuracy than the other models. For self-calibration with additional parameters, the model can reduce the correlation of the parameters, improve the solved accuracy of the parameters in the exterior and interior orientation models of the ZY-3 sensors, and ensure the correctness and stability of the calibration results.Index Terms-High resolution, in-orbit calibration, piece-point, satellite optical sensor, systematic-error model, trajectory.

Cross-Calibration of GF-1/WFV over a Desert Site Using Landsat-8/OLI Imagery and ZY-3/TLC Data

“…In addition, practical and repeatable comparative analyses of the Landsat-7/ETM+ and the Landsat-8/OLI were conducted by Peng et al [22] from spectral bands and vegetation indices, and the results showed that the two sensors had high similarity (the R 2 was greater than 0.96) though subtle differences existed. Therefore, the ETM+ and OLI imagery can be used as complementary data [23].…”

“…The primary characteristics of the ZY-3 are listed in Table 3. The applications of the ZY-3 data are primarily cartography, DEM modelling and resource investigation [3,23,28]. Obviously, the DEM extracted by the ZY-3/TLC has a higher spatial resolution and is more suitable for the cross-calibration of the GF-1/WFV than the ASTER GDEM.…”

Evaluation of the RPC Model for Ziyuan-3 Three-Line Array Imagery

“…As a relatively new optical system, the ZY-3 satellite has been in operation since 9 January 2012. ZY-3 satellite is equipped with three-line scanners, nadir (NAD), backward (BWD), and forward (FWD) views and provides worldwide coverage being suitable for applications such as the creation of maps on a scale of 1:50000 and the updating of the maps on a 1:25000 scale (Chen et al, 2015, Tang et al, 2015. This paper presents an approach to generate the RPCs for ZY-3 imagery from RSM.…”

Evaluation of the RPC Model for Ziyuan-3 Three-line Array Imagery

“…As a relatively new optical system, the Ziyuan-3 (ZY-3) satellite has been in operation since 9 January 2012. ZY-3 satellite is equipped with three-line scanners (nadir, backward, and forward views) and provides worldwide coverage being suitable for applications such as the creation of maps on a scale of 1:50000 and the updating of the maps on a 1:25000 scale (Chen et al, 2015, Tang et al, 2015.…”