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1[[cirlced]]
Talk to Banda's Class
~ Last 30 yrs.... Earth System Science [systems interconnected]
-> To understand these connections requires (in addition to GND data) global perspective (instruments from space)

Advantages: - Global Monitoring (in ~ days/weeks, see [[illegible]])
- "Continuously" over long [[illegible]]
- Cover large area per image
(context)
[also a disadvantage...]
Trade-off: Want high resolution (~10's m/pixel) ->1km "
Bug global coverage

->That trade-off helps determine where, in space, you put these instruments
Most Earth-observing satellites (with exc. of wx) are in low earth orbit
~250-800km (compared to 40,000km)
[[circle surrounded by another circle with dashes]] (easy to see why)

How do they view the globe?
[[drawing of Earth on its axis with a line around it to indicate orbit]] Period ~90-100 min
Earth rotates underneath