Global 30 Arc-Second Elevation (GTOPO30)

GTOPO30 is a global digital elevation model (DEM) with a horizontal grid spacing of 30 arc seconds (approximately 1 kilometer). GTOPO30 was derived from several raster and vector sources of topographic information. For easier distribution, GTOPO30 has been divided into tiles which can be selected from the map shown above. Detailed information on the characteristics of GTOPO30 including the data distribution format, the data sources, production methods, accuracy, and hints for users, is found in the GTOPO30 README file.

GTOPO30是一款全球数字高程模型（Digital Elevation Model，DEM），其水平网格间距为30角秒（约1千米）。该数据集基于多种栅格与矢量地形数据源生成。为便于分发，GTOPO30被划分为若干瓦片，用户可从上方展示的地图中选取所需瓦片。有关GTOPO30的详细特征信息，涵盖数据分发格式、数据源、制作方法、精度及用户使用提示等，均可在GTOPO30的README文件中查阅。

搜集汇总

背景与挑战

背景概述

GTOPO30是一个全球数字高程模型（DEM），具有30角秒（约1公里）的水平分辨率，提供全球地形高程数据。该数据集于1996年完成，由美国地质调查局（USGS）联合多个国际机构合作开发，整合了多种栅格和矢量数据源，并分割为图块以便分发，用户可通过EarthExplorer工具进行搜索和下载。