The data layers of terrain classification using 30 m DEM of Japan, the Land Condition Map and Shaded-relief (GSI) can be superimposed. The map legend of the Land Condition Map is
here (sorry, in Japanese only).
30m解像度のDEMから作成した日本の地形分類データのレイヤ（J_Terrain16_V1・V2）、国土地理院の土地条件図と陰影起伏を重ね合わせできます。土地条件図の凡例は
こちらです。
Usage
This site was created to view the data of the following paper.
Please be sure to cite the following paper for publishing your results using the data of this Japanese terrain classification.
このサイトは下記の論文のデータ閲覧サイトです。
[Citation for J_Terrain16_V1]
Iwahashi J, Yamazaki D, Nakano T, Endo R (2021) Classification of topography for ground vulnerability assessment of alluvial plains and mountains of Japan using 30 m DEM. Progress in Earth and Planetary Science, 8:3. DOI: 10.1186/s40645-020-00398-0 LINK
[Citation for J_Terrain16_V2]
Iwahashi J (2025) Depth to bedrock in Japan: insights from borehole data and terrain analysis using digital elevation models. Progress in Earth and Planetary Science,12, 23 DOI:10.1186/s40645-025-00698-3 LINK
When you use the data in your paper or presentation or product, please be sure to follow the above citation, licensed under a Creative Commons CC-BY 4.0.
Geospatial Information Authority of Japan Website Terms of Use ( https://www.gsi.go.jp/ENGLISH/page_e30286.html ) also applies to this web page.
本データを研究発表等に使用する際は、上記の論文（CC-BY-4.0）を必ず引用してください。
本データ公開サイトには国土地理院コンテンツ利用規約( https://www.gsi.go.jp/kikakuchousei/kikakuchousei40182.html )が適用されます。
J_Terrain16_V1
GeoTIFF (Lambert azimuthal equal-area, WGS1984)
Download GeoTIFF (50 MB, unzipped volume will be about 58 MB)
The cell values correspond to Table 3 in the paper, where 11a is 11 and 11b is 111.
Polygon shapefile (Lambert azimuthal equal-area, WGS1984)
Download Shape file (219 MB, unzipped volume will be about 1.4 GB)
This shapefile includes the data described in Table 1 and Figure 7 of the paper.
Additional information
This study was supported by JSPS KAKENHI JP18H00769.
J_Terrain16_V1 was created from a 30 m DEM which was created by projection transformation from 1 arc-second grid elevation data ("Original DEM before adjustment" of
J-FlowDir; Yamazaki et al., 2018) which was aggregated from the Fundamental Geospatial Data (GSI DEM5A, 5B and 10B) in 2017. The DEM interpolation method was used to average within the grid and modify it to be hydrologically correct.
No data is available for lands not included in the original DEM. There are NoData areas mainly in lakes, coastal areas and high filled lands. Please note that NoData does not necessarily mean water bodies.
本研究はJSPS科研費JP18H00769の助成を受けたものです。
J_Terrain16_V1は1秒メッシュの数値標高モデル（
J-FlowDirの"Original DEM before adjustment"；基盤地図情報のDEM5A、5B、10Bが集約されたもの; 山崎ほか,2018）から作成されました。DEMの補間法はグリッド内の平均値と水文学的に正しくするための修正が使われています。
元のDEMに含まれていない陸地はデータがありません。主要な湖沼、海岸、高い盛土地がNoDataになっています。NoDataは必ずしも水部ではないことにご注意ください。
J_Terrain16_V2
GeoTIFF (Lambert azimuthal equal-area, WGS1984)
Download GeoTIFF (61 MB, unzipped volume will be about 80 MB)
The legend correspond to J_Terrain16_V1. Besides, in J_Terrain16_V2, reclaimed lands and high fills have a value of 999.
セル値（凡例）はJ_Terrain_V1と共通しています。さらに、J_Terrain_V2では、埋立地と高い盛土地を999で示しています。
Additional information
The J_Terrain16_V2, using the new DEM downloaded in August 2022 from the Fundamental Geospatial Data of GSI and Yoshida (2023) DEM with artificial fill removed in the main plains, was created in 2024. TIN was used as the interpolation method for the DEM. Small reefs and islets may have no data.
J_Terrain16_V2（2022年8月にダウンロードしたより高精度な基盤地図情報数値標高モデルと、主要な平野の人工的な盛土が取り除かれた吉田（2023）のDEMから再構築した地形分類データ）を2024年に作成しました。DEMの補間法はTINが使われました。小さな岩礁や小島はデータが無いことがあります。
Related studies
岩橋純子 (1994) 数値地形モデルを用いた地形分類手法の開発. 京都大学防災研究所年報 37B:141-156 (in Japanese with English abstract and figures) LINK
岩橋純子・神谷泉 (1995) 標高データを用いた画像処理手法による地形分類 ー国土数値情報を用いた例を中心としてー. 情報地質 6:97-108 (in Japanese with English abstract) https://doi.org/10.6010/geoinformatics1990.6.2_97
Iwahashi J, Pike RJ (2007) Automated classifications of topography from DEMs by an unsupervised nested-means algorithm and a three-part geometric signature, Geomorphology, 86, 409-440. https://doi.org/10.1016/j.geomorph.2006.09.012 Data download site
Iwahashi J, Kamiya I, Matsuoka M and Yamazaki D (2018) Global terrain classification using 280 m DEMs: segmentation, clustering, and reclassification. Progress in Earth and Planetary Science, 5:1. https://doi.org/10.1186/s40645-017-0157-2 Data download site
Iwahashi J and Yamazaki D (2022) Global polygons for terrain classification divided into uniform slopes and basins. Progress in Earth and Planetary Science, 9, 33. LINK Data download site
吉田一希（2023）低地の地形解析に適した高精度DEMの作成.日本地理学会発表要旨集，2023年度日本地理学会春季学術大会．https://doi.org/10.14866/ajg.2023s.0_64
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