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radar methods  search
NTground-penetrating radar
 lidar methods
UFradar exploration
RTgeophysical methods
 backscattering
 Doppler effect
 echo sounding
 geophysical surveys
 reflection methods
 remote sensing
 multispectral scanner
 Geosat
 electromagnetic methods
 radio-wave methods
 ERS-1
 microwave methods
 Magellan Program
 image enhancement
 RADAM
SNBefore 1978, search radar.