This is a Space Shuttle radar (SIR-C) image of the town of Hilo on the north east side of the Big Island. The black line close to the Bay is the Lyman Field Airport. Notice that several of the lava flows (the red and green linear features at bottom left) from Mauna Loa can be easily seen despite the fact that they are run through tropical vegetation on the lower slopes. The different colors have been generated by displaying different radar wavelengths as different colors. Red corresponds to L-band (23 cm) horizontally transmit and receive (HH polarization), green is L-band horizontally transmit and vertically receive (HV polarization), and blue is C-band (5.6 cm) horizontally transmit and vertically receive (HV polarization).
Copyright by P. Mouginis-Mark