将地理知识融入深度学习,绘制时空局部气候区图,探索中国各气候区的热环境

IF 10.6 1区 地球科学 Q1 GEOGRAPHY, PHYSICAL ISPRS Journal of Photogrammetry and Remote Sensing Pub Date : 2024-08-21 DOI:10.1016/j.isprsjprs.2024.08.004
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引用次数: 0

摘要

代表城市结构和土地利用模式的地方气候区(LCZ)方案对于城市热岛(UHI)研究至关重要。考虑到空间和时间异质性的细粒度 LCZ 制图可以更精确地描述地表热特性,从而在气候变化研究中实现对时空趋势的全面分析和理解。然而,基于数据驱动的深度学习方法在应对现实世界场景中复杂的城市景观时存在局限性,包括不同低碳区的光谱相似性和城市低碳区类别的地理空间异质性。在本研究中,我们考虑了先前的地表空间信息,包括一组光谱指数和城市形态参数(UMPs),构建了一个地理知识库,用于增强 LCZ 特征。然后,我们将可解释的地理知识库以端到端的方式集成到可学习的深度学习框架中,通过多层次融合策略融合多源异构数据,实现精确的低纬度区测绘。为了评估所提出的框架,我们使用了由Landsat-8数据构建的中国气候区时间序列LCZ(CClimate-TLCZ)数据集,该数据集的空间分辨率为30米,覆盖了中国18个具有代表性的城市。实验结果表明,所提出的框架在 18 个城市中取得了最佳结果,平均总体精度超过 94%,比标准 WUDAPT 方法高出 20%以上。此外,对 LCZ 绘图驱动的地表温度(LST)和地表 UHI(SUHI)应用的分析表明,同一气候带内的城市具有相似的 LST 分布模式,而不同气候带之间存在显著的异质性。各气候区内 LST 分布模式的年度一致性证明了 LCZ 分类方案的有效性,并为城市热环境研究提供了精确的 LCZ 地图。从 2016 年到 2022 年,SUHI 强度先上升后下降,表明城市热环境有所改善。这些发现强调了精确绘制 LCZ 图在城市气候适应性和可持续城市规划中的关键作用。
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Integrating geographic knowledge into deep learning for spatiotemporal local climate zone mapping derived thermal environment exploration across Chinese climate zones

The Local Climate Zone (LCZ) scheme representing urban structure and land use pattern is essential for urban heat island (UHI) research. Fine-grained LCZ mapping considering spatial and temporal heterogeneity can provide a more precise characterization of surface thermal properties, thereby enabling a comprehensive analysis and understanding of spatiotemporal trends in climate change research. However, data-driven deep learning-based methods have limitations in coping with the complex urban landscapes of the real-world scenarios, including the spectral similarity of different LCZ and the geospatial heterogeneity of urban LCZ categories. In this study, we constructed a geographic knowledge base for enhanced LCZ characterization with the consideration of prior surface spatial information, including a set of spectral indices and urban morphological parameters (UMPs). Then, we integrated the explicable geographic knowledge base into a learnable deep learning framework in an end-to-end manner for accurate LCZ mapping by fusing multi-source heterogeneous data with a multi-level fusion strategy. The constructed Chinese Climate Zone Time Series LCZ (CClimate-TLCZ) dataset derived from Landsat-8 data with a 30 m spatial resolution, covering 18 representative cities in China, were used to evaluate the proposed framework. The experimental results demonstrate that the proposed framework achieved optimal outcomes across 18 cities, with an average overall accuracy exceeding 94 %, which is more than 20 % higher than that obtained by the standard WUDAPT method. Furthermore, the analysis of LCZ mapping-driven land surface temperature (LST) and surface UHI (SUHI) applications shows that cities within the same climate zone have similar LST distribution patterns, while significant heterogeneity exist between different zones. The annual consistency of LST patterns within each climate zone supports the validity of the LCZ classification scheme and accurate LCZ mapping for urban thermal environment studies. From 2016 to 2022, SUHI intensity initially increases and then decreases, indicating improvements in the urban thermal environment. These findings underscore the critical role of precise LCZ mapping in urban climate resilience and sustainable urban planning.

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来源期刊
ISPRS Journal of Photogrammetry and Remote Sensing
ISPRS Journal of Photogrammetry and Remote Sensing 工程技术-成像科学与照相技术
CiteScore
21.00
自引率
6.30%
发文量
273
审稿时长
40 days
期刊介绍: The ISPRS Journal of Photogrammetry and Remote Sensing (P&RS) serves as the official journal of the International Society for Photogrammetry and Remote Sensing (ISPRS). It acts as a platform for scientists and professionals worldwide who are involved in various disciplines that utilize photogrammetry, remote sensing, spatial information systems, computer vision, and related fields. The journal aims to facilitate communication and dissemination of advancements in these disciplines, while also acting as a comprehensive source of reference and archive. P&RS endeavors to publish high-quality, peer-reviewed research papers that are preferably original and have not been published before. These papers can cover scientific/research, technological development, or application/practical aspects. Additionally, the journal welcomes papers that are based on presentations from ISPRS meetings, as long as they are considered significant contributions to the aforementioned fields. In particular, P&RS encourages the submission of papers that are of broad scientific interest, showcase innovative applications (especially in emerging fields), have an interdisciplinary focus, discuss topics that have received limited attention in P&RS or related journals, or explore new directions in scientific or professional realms. It is preferred that theoretical papers include practical applications, while papers focusing on systems and applications should include a theoretical background.
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