A Method for Assigning Appropriate Elevation to Water Portion ion the DEM Data
A Method for Assigning Appropriate Elevation to Water Portion ion the DEM Data
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一种根据 DEM 数据为水部分分配适当高程的方法
DOI：
10.1117/12.2590841
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
and Katsumi TADAMURA
中科院分区：
文献类型：
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作者：
Daishi Fujiwara;Toshikazu SAMURA;and Katsumi TADAMURA
日本地理空间信息局（GSI）通过将地球表面划分为等间距的正方形网格来发布数字高程模型（DEM）数据，并将高程值分配给网格元素（单元）的中心。目前，可用的开放数据是从激光测量（DEM 5A）和摄影测量（DEM 5 B）获得的5米网格数据和从等高线（DEM 10 B）估计的10米网格数据。5米网格数据在水域（如海洋和内陆水面）上存在重大问题。具体而言，覆盖日本大部分地区的DEM 5A数据的水部分被分配了-9999的标记值。为了解决这个问题，本文提出了一种方法，分配一个合适的高程值的每个单元格的水域部分在5米网格数据与不同的算法，根据其分类：海洋，湖泊和沼泽，或河流。为了证实其有效性，该方法被应用到实际的DEM数据。
The Geospatial Information Authority of Japan (GSI) publishes digital elevation model (DEM) data by dividing Earth’s surface into equally spaced square meshes, and an elevation value is assigned to the center of a mesh element (cell). Currently, the available open data are 5-m mesh data obtained from laser measurements (DEM5A) and photogrammetry (DEM5B) and 10-m mesh data estimated from contour lines (DEM10B). The 5-m mesh data have significant issues over water areas, such as the sea and inland water surfaces. Specifically, the water portion of the DEM5A data, which cover much of Japan, is assigned a marker value of −9999. To solve this problem, this paper proposes a method for assigning an appropriate elevation value to every cell of the water portion in 5-m mesh data with different algorithms according to its classification: sea, lake and marshes, or river. To confirm its usefulness, the proposed method was applied to actual DEM data.