From Philadelphia, at a meeting of the Association of American Geographers
ANCIENT SCRAPES. Petroglyphs at a site near Little Lake, Calif., as seen in visible light (above) and in a false-color, laser-scanned image (below). Wasklewicz
Wasklewicz
Researchers have developed a way to use laser-based surveying instruments to create detailed images of ancient etchings on stone.
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