1.Nanjing University of Information Science & Technology;2.Institute of Urban Meteorology, CMA, Beijing;3.Jilin Weather Modification Office
城市高分辨建筑物分类数据对城市气象及相关学科的发展至关重要。局地气候分区（Local Climate Zone，LCZ）方案是一种新的城市高分辨土地利用分类数据集构建方法。基于LCZ分类体系制作了中国63个城市的具有建筑物分类的高分辨土地利用类型（High-Resolution Land Use Classification，HRLUC)数据集。原数据采用2017 – 2019年的Landsat 8卫星数据及高分辨Google earth 影像，涵盖51933个训练样本（>100m?100m）和15841个验证样本。精度评估结果表明，中国63个城市的HRLUC数据集总体质量较好，总体准确率在72% - 92%，平均准确率为81%；城市用地类型准确率在59% - 82%，平均准确率为72%；自然覆盖类型准确率在71% - 100%，平均准确率为89%。与同类研究工作相比，该研究结果城市用地类型准确率较高。与欧美发达国家不同，中国为发展中国家，大部分的城市尚在发展建设中。尚在建设的下垫面占据了比较大的比例，但这一下垫面类型尚未被LCZ方法定义。在原始LCZ分类的基础上，增加了修建区作为中国城市LCZ分类的基本类型。在研究的63个城市中，有24个城市的修建区占比超过了5%，这类下垫面多位于城郊结合部。
High-resolution urban building classification data is critical to the development of urban meteorology and related disciplines. The Local Climate Zone (LCZ) scheme is a new method to construct urban high-resolution land use classification (HRLUC) dataset. Based on the LCZ classification system, HRLUC dataset with building classification for 63 cities in China was produced in this paper. Landsat 8 satellite images from 2017 to 2019 were used to produce this dataset. The dataset covers approximately 51,933 training samples (>100m?100m) and 15,841 validation samples. The results from the quality assessments show that the HRLUC dataset of 63 cities in China are generally of good quality, with an overall accuracy between 72% and 92% among cities, and an average overall accuracy of 81%. The accuracy of built - up areas in the selected cities ranges from 59% to 82%, with an average accuracy of 72%. The accuracy for natural land cover areas ranges from 71% to 100%, and the mean accuracy is 89%. Compared to similar research work, the accuracy for built types in this study is higher. Different from developed countries such as Europe and America, China is a developing country with most of its cities still under development and construction. A large proportion of the underlay surface is under construction, but the type of this underlay surface has not been classified into LCZ classification system. In this paper, based on the original LCZ classification system, construction zone was added as the basic types of LCZ classification in Chinese cities. Among the 63 cities studied in this paper, 24 cities account for more than 5% of construction zone, and the underlying surface of this type is mostly located at the junction of suburbs.
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