USGS 30 ARC-second Global Elevation Data

引用方式

Earth Resources Observation and Science Center/U.S. Geological Survey/U.S. Department of the Interior. 1997. USGS 30 ARC-second Global Elevation Data, GTOPO30. Research Data Archive at the National Center for Atmospheric Research, Computational and Information Systems Laboratory. http://rda.ucar.edu/datasets/ds758.0/.