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1.武汉大学测绘遥感信息工程全国重点实验室,湖北 武汉,430079
2.江苏省测绘工程院,江苏 南京,210013
3.国防科技大学气象海洋学院,湖南 长沙,410073
4.中国科学院空天信息创新研究院,北京,100094
5.起源太空(南京)科技有限公司,江苏 南京,210046
Received:24 March 2024,
Published:05 October 2025
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曹汉瑞,王妍,李熙,等.VIIRS夜光影像中农田火像素识别方法[J].武汉大学学报(信息科学版),2025,50(10):2072-2085.
CAO Hanrui,WANG Yan,LI Xi,et al.Method for Detecting Farmland Fire Pixels in VIIRS Night-Time Light Images[J].Geomatics and Information Science of Wuhan University,2025,50(10):2072-2085.
曹汉瑞,王妍,李熙,等.VIIRS夜光影像中农田火像素识别方法[J].武汉大学学报(信息科学版),2025,50(10):2072-2085. DOI:10.13203/j.whugis20230256
CAO Hanrui,WANG Yan,LI Xi,et al.Method for Detecting Farmland Fire Pixels in VIIRS Night-Time Light Images[J].Geomatics and Information Science of Wuhan University,2025,50(10):2072-2085. DOI:10.13203/j.whugis20230256
夜光遥感影像已被广泛应用于人类活动、社会经济等方面的研究。南部非洲的夜光影像上存在烧田产生的农田火像素,这些像素易与城镇灯光像素混淆,干扰了夜光影像在社会经济评估中的应用。以南部非洲的10个大陆国家为研究区域,基于国家极地轨道伙伴关系卫星(national polar-orbiting partnership
NPP)/可见光红外成像辐射仪(visible infrared imaging radiometer
VIIRS)数据生产的黑色大理石(Black Marble)产品,首先构建了夜光辐亮度时间序列的3个特征;然后采用随机森林分类方法将夜光影像中的像素分为农田火像素、稳定灯光像素和全黑像素;最后采用分层随机抽样,用时间序列夜光辐亮度数据、高分辨率卫星影像和地表覆盖数据对像素分类结果进行精度检验。结果表明,像素分类的总体精度为91.2%,平均生产者精度为91.9%,平均用户精度为91.0%,其中农田火像素分类的生产者精度和用户精度分别为86.4%和92.6%。所提方法可在后续应用中滤除Black Marble产品中的农田火像素,提升夜光影像对非洲社会经济的评估精度。
Objectives
2
Night-time light images have been widely used in human activity analysis
social economy estimation and other aspects. However
on night-time light images
farmland fire pixels caused by burning fields are easily confused with the urban light pixels
which interferes with the socioeconomic assessments using night-time light images. Based on the radiance time series characteristics of pixels
the farmland fire pixels on night-time light images can be identified through the random forest method.
Methods
2
10 continental countries in southern Africa were taken as the research area. Based on Black Marble product produced by national polar-orbiting partnership(NPP)/visible infrared imaging radiometer(VIIRS) data
three characteristics of the time series of night-time light radiance were constructed
and the random forest classification method was used to divide the pixels into farmland fire pixels
stable light pixels
and black pixels.
Results
2
Stratified random sampling was used to manually test the classification accuracy
using time series of night-time light data
high resolution satellite images and land cover data. Results show that the overall accuracy of pixel classification is 91.2%
the average producer accuracy is 91.9%
and the average user accuracy is 91.0%. Among them
the producer accuracy and user accuracy of farmland fire pixel classification are 86.4% and 92.6%
respectively.
Conclusions
2
The random forest classification method was used to classify the pixels on night-time light images into farmland fire pixels
stable light pixels and black pixels with high accuracy. The proposed method can be used to filter out farmland fire pixels in Black Marble products
so as to improve the evaluation accuracy for African social economy using night-light images.
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