测绘通报 ›› 2026, Vol. 0 ›› Issue (8): 82-88,111.doi: 10.13474/j.cnki.11-2246.2026.0812

• 学术研究 • 上一篇    

基于时空变异与空间聚类的西北干旱区伪不变场优选与评价

袁烨1, 陈伟1, 唐洪钊2, 张佳丽1, 赵静1   

  1. 1. 中国矿业大学(北京)地球科学与测绘工程学院, 北京 100083;
    2. 自然资源部国土卫星遥感应用中心, 北京 100048
  • 收稿日期:2025-11-28 发布日期:2026-09-12
  • 通讯作者: 陈伟。E-mail:chenw@cumtb.edu.cn
  • 作者简介:袁烨(2001—),女,硕士,主要研究方向为定量遥感、卫星辐射定标。E-mail:2575691425@qq.com
  • 基金资助:
    国家自然科学基金(42371351)

Selection and evaluation of pseudo-invariant calibration sites in the arid region of Northwest China based on spatio-temporal variability and spatial clustering

Yuan Ye1, Chen Wei1, Tang Hongzhao2, Zhang Jiali1, Zhao Jing1   

  1. 1. College of Geoscience and Surveying Engineering, China University of Mining and Technology(Beijing), Beijing 100083, China;
    2. Land Satellite Remote Sensing Application Center, Ministry of Natural Resources, Beijing 100048, China
  • Received:2025-11-28 Published:2026-09-12

摘要: [目的] 针对当前中国伪不变场(PICS)研究成果较少、区域代表性不足及多尺度评价体系缺乏等问题,本文选取并综合评价了中国西北干旱区的潜在伪不变场。[方法] 基于2020—2024年Landsat 8数据,选取中国西北干旱区作为研究区,综合采用变异系数(CV)指标和Getis-Ord G*i空间聚类方法,从时空稳定性与空间一致性两方面开展辐射伪不变场的选取与综合评价。[结果] 结果表明:研究区具有时空稳定性和空间一致性的区域主要分布在塔里木盆地、柴达木盆地等典型沙漠、戈壁与盐沼地;进一步筛选得到20个高一致性候选场地,并重点分析其中8个优选场的地表反射率特征。这些优选场在多时相、多年度尺度上均表现出显著的光谱稳定性和平稳性。[结论] 本文验证了中国西北干旱区作为优质PICS区域在卫星辐射定标中的重要潜力与优势。

关键词: Landsat 8, 变异系数, 空间聚类, 辐射定标, 伪不变场

Abstract: [Purposes] This study aims to select and comprehensively evaluate potential pseudo-invariant calibration sites (PICS)in the arid region of Northwest China,addressing the current limitations of PICS studies in China,such as insufficient research coverage,poor regional representativeness,and the lack of a multi-scale evaluation framework. [Methods] Using Landsat 8 data from 2020 to 2024,the arid region of Northwest China was selected as the study area.The coefficient of variation (CV)index and the Getis-Ord G*i spatial clustering method were integrated to jointly evaluate the spatiotemporal stability and spatial consistency of surface reflectance for identifying and assessing potential PICS. [Findings] The results show that areas with high spatiotemporal stability and spatial consistency are primarily located in the Tarim Basin,Qaidam Basin,and other typical desert,gobi,and salt-flat regions.Twenty highly consistent candidate sites were identified,and eight optimal sites were selected for detailed analysis of surface reflectance characteristics.These optimal sites exhibited remarkable spectral stability and interannual consistency across multiple temporal scales. [Conclusions] The findings confirm the significant potential and advantages of the arid region of Northwest China as an ideal area for satellite radiometric calibration.

Key words: Landsat 8, coefficient of variation, spatial clustering, radiometric calibration, pseudo-invariant calibration site

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