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3
TYPES of INSTRUMENTS
(all measure light)
- CAMERAS (IMAGE IN VISIBLE LIGHT)
- IR "CAMERAS" (IMAGE IN IR LIGHT)
(heat)
T-differences
- SPECTRUM -> diff object/materials have diff. characteristic spect.
- RADARS -> send down a pulse bounce off Earth; receive it
TOPEX-POSEIDON 1) altimeter [[image]] (straight down)
SIR-C 2) SLR [[image]] measure of roughness of terrain
e.g. Magellan
VARS - atmospheric: molecules and atoms
-> NOW: WHAT CAN YOU SEE?