THEMIS detects infrared reflectance of ten spectral bands which are used for identifying the composition of the martian surface.
Using multiple-spectra allows Odyssey to better characterize the minerals found on Mars.
THEMIS is similar to TES on the Mars Global Surveyor but has a lower spectral resolution (10 bands compared to TES's 143 bands) but has an increased spatial resolution (100 m compared to 3 x 6 km on TES)  Odyssey is searching for terrains that represent past water, so the increased special resolution and narrow spectral resolution are targeting hydrated minerals.
THEMIS detects infrared reflectance of ten spectral bands which are used for identifying the composition of the martian surface. Using multiple-spectra allows Odyssey to better characterize the minerals found on Mars. THEMIS is similar to TES on the Mars Global Surveyor but has a lower spectral resolution (10 bands compared to TES's 143 bands) but has an increased spatial resolution (100 m compared to 3 x 6 km on TES)  Odyssey is searching for terrains that represent past water, so the increased special resolution and narrow spectral resolution are targeting hydrated minerals.
Mawrth Vallis