Rio Negro Province, Argentina
August 23, 2001
A volcanic plateau near La Esperanza, Argentina offers a good opportunity to compare geospatial data types. On the left is a portion of a Landsat 7 browse image, slightly contrast enhanced, but near natural color. The browse product is a low resolution snapshot of the real data, but shows the color contrasts between volcanic rocks and weathering surfaces. Natural lighting and shadows highlight some topographic features, but information about the surface color dominates the image. On the right is a shaded and colored relief map created from data collected by the Shuttle Radar Topography Mission (SRTM). Color represents elevation in the image (green, yellow, red and white from low to high). The image has also been shaded based upon a computer model of the slope of the surfaces. The erosion of the plateau and features such as the volcanic cones on the south edge of the plateau are very apparent in the elevation model. Each of these images has unique information to offer the scientist, explorer, rancher or land use planner.