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WFST Astrometric Calibration. I. Modeling Global Geometric Distortion with Zernike Polynomials

  • Authors: Chao Yang, Min Fang, Xian Zhong Zheng, Guoliang Li, Binyang Liu, Zheng Lou, Zhen Wan, Miaomiao Zhang, Tian-Rui Sun, Lulu Fan, Xiaoling Zhang, Xu Kong, Yongquan Xue, Wen Zhao, Bin Li, Wentao Luo, Feng Li, Wei Liu, Jian Wang, Hongfei Zhang, Hao Liu, Qinfeng Zhu, Hairen Wang, Dazhi Yao

Chao Yang et al 2026 The Astronomical Journal 171 .

  • Provider: AAS Journals

Caption: Figure 2.

Framework of global GD modeling. The green box represents the CCD calibration module, which is used to remove instrumental signals from the images. The blue box denotes the initial astrometric calibration module for extracting source catalogs from the images and provides the CD matrix together with CRVAL and CRPIX values for GD modeling. The red box indicates the precise astrometric calibration module, which outputs a combined source catalog for all CCDs after applying the GD model and corrections.

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