遥感图像菱形三十面体六边形全球离散格网建模及存储  

Modelling and Storage Method for Hexagonal Remote Sensing Images in Rhombic Triacontahedron Discrete Global Grid System

作　　者：梁启爽 陈艺航 贲进[1] 周建彬 丁俊杰 代金池 LIANG Qishuang;CHEN Yihang;BEN Jin;ZHOU Jianbin;DING Junjie;DAI Jinchi(Institute of Geospatial Information,Information Engineering University,Zhengzhou 450001,China)

机构地区：[1]信息工程大学地理空间信息学院,郑州450001

出　　处：《地球信息科学学报》2023年第12期2361-2373,共13页Journal of Geo-information Science

基　　金：河南省重大科技专项国家超级计算郑州中心创新生态系统建设科技专项(201400210100)。

摘　　要：全球离散格网系统(Discrete Global Grid System,DGGS)是数字化的地球参考框架,在多源、多尺度地球空间数据集成分析方面优势明显。本文选择菱形三十面体六边形全球离散格网系统,提高格网与地球的整体拟合精度和空间采样率;建立遥感图像六边形像素数学模型,提出兼容开放标准格式的数据存储方案。①根据地理位置将遥感图像格网化,完成遥感图像六边形DGGS建模;其次,建立六边形单元与矩形像素严密对应关系,等效保留六边形单元的邻域信息;②采用GeoTIFF开放标准格式精确存储六边形属性值以及投影、变换参数;③设计依托六边形DGGS格网标准数据集为基础的多尺度六边形DGGS生成算法。实验结果表明:本文方案不仅能保证六边形像素遥感图像数据与标准文件格式兼容,而且能保证矩形像素与六边形单元逐一对应,较好地保留了六边形单元数据的图像信息和空间分布特征,相较于欧空局SMOS数据组织方案更具优势。本文方案打破了六边形单元与矩形像素遥感图像的数据组织壁垒,使用常见GIS/RS软件即可读取六边形像素的遥感图像,并可通过对矩形像素的操作等效实现对六边形单元的处理,有望推动六边形DGGS在遥感数据组织、处理、共享等方面的应用。The explosive growth of multisource Remote Sensing(RS)data poses challenges to the application of fusion analysis.Discrete Global Grid System(DGGS)is a digital earth reference model supporting integration and analysis of multisource and multiscale geospatial data.In this study,a Rhombic Triacontahedron(RT)hexagonal DGGS is chosen as the basic digital framework to improve the overall fitting accuracy to the Earth and the spatial sampling efficiency of the grid which is conceptually equivalent to pixel.A mathematical model of hexagonal pixels of RS images is established,and the storage scheme of hexagonal pixels compatible with open-standard format is also proposed.First,the RS images are gridded according to the geographical location,and the hexagonal DGGS modeling of RS image was completed.Secondly,a rigorous correspondence between hexagon and rectangular pixels is established geometrically to preserve the neighborhood information of hexagon pixels by improving the way of double offset coordinates mapped to the rectangular array.Then,the GeoTIFF openstandard format is used to accurately store the hexagonal pixel values,projection and transformation parameters.Finally,a multiscale hexagonal DGGS generation algorithm based on the hexagonal DGGS standard dataset is designed.Experiment results show that using RT hexagonal equal area grid to organize global scale RS images can realize uniform sampling of global data,ensure the overall consistency of cells in different latitudes,avoid drastic changes of cells in high latitudes,and be more suitable for global scale data processing and analysis.The proposed storage scheme can not only ensure that the hexagon pixel RS image dataset is compatible with the standard file format,but also ensure that the rectangular pixels correspond to the hexagon pixels one by one.Hexagonal pixels could be stored in the open-standard format GeoTIFF with a fixed pattern in the form of rectangular arrays for data access,with transformation parameters and metadata used to reconstruct the hexago

关 键 词：菱形三十面体 全球离散格网系统 六边形 数据建模 双倍偏移坐标 遥感图像 数据存储 SMOS 

分 类 号：TP751[自动化与计算机技术—检测技术与自动化装置]