MDA INFORMATION SYSTEMS / SCIENCE PHOTO LIBRARY MDA INFORMATION SYSTEMS / SCIENCE PHOTO LIBRARY
Pilanesberg volcanic crater (round, upper centre), South Africa, infrared satellite image. North is at top. This mountain-ringed crater, 25 kilometres across, is what remains of a 1.3-billion-year-old extinct volcano. Vegetation (red/green) covers the landscape. The Witwatersrand mountain range runs across centre. A large area of fields (red) is at lower centre. Vegetation (red) lines rivers at bottom left. Pilanesburg lies to the north-west of Johannesburg. This 180-kilometre-wide image was taken on 10 March 1973, in visible and infrared wavelengths, using the Multispectral Scanner (MSS) sensor on NASA's Landsat 1 satellite.
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