Photometry-free sky area visibility estimation method for All-sky Camera  

作　　者：Haiwen Xie Hui Zhi Zhe Kang Shiyu Deng Bingli Niu Lei Wang Xiaojun Jiang 

机构地区：[1]Changchun Observatory,National Astronomical Observatories,Chinese Academy of Sciences,Changchun 130117,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]CAS Key Laboratory of Optical Astronomy,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China [4]Nanjing Institute of Astronomical Optics&Technology,Chinese Academy of Sciences,Nanjing 210042,China

出　　处：《Astronomical Techniques and Instruments》2025年第1期52-64,共13页天文技术与仪器(英文)

基　　金：supported by Natural Science Foundation of Jilin Province(20210101468JC);Chinese Academy of Sciences and Local Government Cooperation Project(2023SYHZ0027,23SH04);National Natural Science Foundation of China(12273063&12203078)。

摘　　要：Observatories typically deploy all-sky cameras for monitoring cloud cover and weather conditions.However,many of these cameras lack scientific-grade sensors,r.esulting in limited photometric precision,which makes calculating the sky area visibility distribution via extinction measurement challenging.To address this issue,we propose the Photometry-Free Sky Area Visibility Estimation(PFSAVE)method.This method uses the standard magnitude of the faintest star observed within a given sky area to estimate visibility.By employing a pertransformation refitting optimization strategy,we achieve a high-precision coordinate transformation model with an accuracy of 0.42 pixels.Using the results of HEALPix segmentation is also introduced to achieve high spatial resolution.Comprehensive analysis based on real allsky images demonstrates that our method exhibits higher accuracy than the extinction-based method.Our method supports both manual and robotic dynamic scheduling,especially under partially cloudy conditions.

关 键 词：All-sky cameras Astronomy image processing Ground-based astronomy Calibration Computational methods Observational astronomy 

分 类 号：P111[天文地球—天文学] V556[航空宇航科学与技术—人机与环境工程]