Google Earth Engine——GTOPO30: Global 30 Arc-Second Elevation全球数字高程模型（DEM），水平网格间距为30角秒（约1公里）。

GTOPO30: Global 30 Arc-Second Elevation

GTOPO30 is a global digital elevation model (DEM) with a horizontal grid spacing of 30 arc seconds (approximately 1 kilometer). The DEM was derived from several raster and vector sources of topographic information. Completed in late 1996, GTOPO30 was developed over a three-year period through a collaborative effort led by the U.S. Geological Survey's Center for Earth Resources Observation and Science (EROS). The following organizations participated by contributing funding or source data: the National Aeronautics and Space Administration (NASA), the United Nations Environment Programme/Global Resource Information Database (UNEP/GRID), the U.S. Agency for International Development (USAID), the Instituto Nacional de Estadistica Geografica e Informatica (INEGI) of Mexico, the Geographical Survey Institute (GSI) of Japan, Manaaki Whenua Landcare Research of New Zealand, and the Scientific Committee on Antarctic Research (SCAR).

GTOPO30是一个全球数字高程模型（DEM），水平网格间距为30角秒（约1公里）。该DEM是由几个光栅和矢量来源的地形信息得出的。GTOPO30于1996年底完成，通过美国地质调查局的地球资源观测和科学中心（EROS）领导的合作努力，历时三年开发。以下组织通过提供资金或源数据参与其中：美国国家航空航天局（NASA）、联合国环境规划署/全球资源信息数据库（UNEP/GRID）、美国国际开发署（USAID）、墨西哥国家地理信息系统研究所（INEGI）、日本地理测量研究所（GSI）、新西兰Manaaki Whenua Landcare Research和南极研究科学委员会（SCAR）。

Dataset Availability

1996-01-01T00:00:00 - 1996-01-01T00:00:00

Dataset Provider

​​United States Geological Survey​​

Collection Snippet

Copied

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​ee.Image("USGS/GTOPO30")​

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Bands Table

Name	Description	Min*	Max*	Resolution	Units
elevation	Elevation	-407	8752	927.67 meters	Meters

* = Values are estimated

var dataset = ee.Image('USGS/GTOPO30');
var elevation = dataset.select('elevation');
var elevationVis = {
  min: -10.0,
  max: 8000.0,
  gamma: 1.6,
};
Map.setCenter(11.69, 43.9, 4);
Map.addLayer(elevation, elevationVis, 'Elevation');