Elevation

USGS maintains its core strengths in characterizing and understanding complex Earth and biological systems through research; modeling; highly accurate topographic, geologic, hydrographic, and biogeographic maps; and delivery of high-quality earth observation data. Programs include cooperative data collection systems, cross-boundary synthesis, and scientific data delivery for users worldwide. USGS...

Landscapes of West Africa: A Window on a Changing World is an atlas and unique dataset that uses time-series satellite image data and field-based photography to tell the story of wide-ranging land change across 17 countries. EROS scientists selected the years 1975, 2000 and 2013 to characterize the landscapes and create the product, which represents the broadest effort to map the region in history...