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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