A method for assigning appropriate elevation to water portion in the DEM data

Daishi Fujiwara; Toshikazu Samura; Katsumi Tadamura

doi:10.1117/12.2590841

13 March 2021 A method for assigning appropriate elevation to water portion in the DEM data

Daishi Fujiwara, Toshikazu Samura, Katsumi Tadamura

Proceedings Volume 11766, International Workshop on Advanced Imaging Technology (IWAIT) 2021; 117662Y (2021) https://doi.org/10.1117/12.2590841
Event: International Workshop on Advanced Imaging Technology 2021 (IWAIT 2021), 2021, Online Only

Abstract

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.

Citation Download Citation

Daishi Fujiwara, Toshikazu Samura, and Katsumi Tadamura "A method for assigning appropriate elevation to water portion in the DEM data", Proc. SPIE 11766, International Workshop on Advanced Imaging Technology (IWAIT) 2021, 117662Y (13 March 2021); https://doi.org/10.1117/12.2590841

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