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Ice and Permafrost
MEASUREMENT
Snow
6
*SEA ICE
4
*RADAR
3
ICE
3
PASSIVE SYSTEMS
3
REMOTE DETECTORS
3
Radiofrequency Wave Propagation
3
*BACKSCATTERING
2
*ICE
2
*MICROWAVES
2
AIRBORNE
2
ANTENNAS
2
Active & Passive Radar Detection & Equipment
2
DEPTH
2
FIELD TESTS
2
MICROWAVES
2
SCATTERING
2
SURFACE ROUGHNESS
2
*ELECTROMAGNETIC SCATTERING
1
*LIGHT SCATTERING
1
*PERMAFROST
1
*RADAR REFLECTIONS
1
*Remote sensing
1
*SOILS
1
*STREAMS
1
*SYNTHETIC APERTURE RADAR
1
*VEGETATION
1
ACTIVE-LAYER DEPTH
1
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