DEM Digital Elevation Model Data for 3D Maps

英語 English：Digital Elevation Model　
日語 Japanese：数値標高モデル (すうちひょうこうもでる)　
類義 Synonym：DEM　XYZ model　Elevation map
意味 Meaning：Digital Elevation Model is a map with elevation data. In simple terms, it is a three-dimensional map with length, width, and height.
Digital Elevation Model allows users to see the height of buildings and trees at a glance.
DEM is the abbreviation for Digital Elevation Model among developers.
解説 Commentary：Digital Elevation Model is a spec and there are a number of implementations such as SRTM, ASTER, and ALOS.
多言語対応 Multilingualism：
韓文 Hanguel：수치표고모형 (RR2000　suchipyogomohyeong　발음　수치표고모형　suchipyogomohyeong)
中文 Chinese：繁体 數字高程模型　簡体 数字高程模型　(
shùzìgāochéngmóxíng　shu4zi4gao1cheng2mo2xing2)
探究 Further study：
CGIAR (Consultative Group for International Agricultural Research) CGIAR-CSI (Consultative Group for International Agricultural Research-Consortium for Spatial Information)

英語 English：Space Shuttle Radar Topography Mission　
日語 Japanese：スペースシャトルレーダー地形データ　
類義 Synonym：SRTM　SRTM DEM
意味 Meaning：SRTM DEM is topographical data collected by radar from the Space Shuttle to Earth. In addition to latitude and longitude data, SRTM DEM has elevation data for mountain ranges. This data enables the development of 3D maps.
SRTM DEM was developed by NASA (National Aeronautics and Space Administration). The development began in 2000 with the launch of the space shuttle Endeavour.
解説 Commentary：SRTM DEM has been updated several times over the years to improve its accuracy.
更新版 SRTM DEM history：

Date	History of Development
2000	Space Shuttle Endeavour launched
2003	SRTM Version 1
2013	SRTM Version 3

データ名 Data name：SRTM Version 3
拡張子 File extension：.hgt
精度 Accuracy：30 meters
範囲 Coverage：Digital elevation models on a near-global scale from 56°S to 60°N
解説 Commentary：.hgt is a file extension for geographic information data files. It is used by the USGS (United States Geological Survey) and other organizations.

英語 English：Advanced Spaceborne Thermal Emission and Reflection Radiometer　
日語 Japanese：ASTER (あすたー)　
類義 Synonym：ASTER DEM　ASTER GDEM
意味 Meaning：ASTER is an imaging sensor installed on the space shuttle, which collects electromagnetic and thermal data. It was developed by NASA, and the Japanese government cooperated through material development. ASTER DEM was part of a joint project between the United States and Japan that started in 1999.
解説 Commentary：ASTER DEM is the result of over 10 years of data collection. It has been released to the public and has varying degrees of accuracy. The data of the earth's surface is useful to develop 3D maps.
更新版 ASTER DEM history：

Date	History of Development
1999	ASTER project started
2009	ASTER GDEM 1 released
2011	ASTER GDEM 2 released
2019	ASTER GWBD 3 released
2019	ASTER GWBD released

英語 English：Advanced Land Observing Satellite Daichi　
日語 Japanese：先進観測衛星大地 (せんしんかんそくえいせいだいち)　
類義 Synonym：ALOS (あろす)　ALOS DEM　JAXA Global ALOS 3D World
意味 Meaning：ALOS is an observation satellite developed by Japan Aerospace Exploration Agency (JAXA).
The Advanced Land Observing Satellite is called Daichi (だいち　大地) in Japanese.
ALOS-1 was launched in 2006, and ALOS-1 in 2014. Each launch has improved the technology, allowing for more accurate data.
ALOS DEM has the ground surface data with 30-meter spacing. ALOS DEM is available to the public.
解説 Commentary：ALOS-3 has a sensor with a resolution of 0.8 meters on the ground.
更新版 ASTER DEM history：

Date	History of Development
2006	だいち1号(ALOS-1) Launched
2011	だいち1号(ALOS-1) Operation terminated
2014	だいち2号(ALOS-2) Launched
202x	だいち3号(ALOS-3) Launched

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