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**The EM spectrum** (Hess & McKnight, 2014). Bands arranged by wavelength, shortest to longest: | Band | Wavelength | |---|---| | Cosmic rays | < 0.00001 µm | | Gamma rays | ~ 0.0001 µm | | X-rays | ~ 0.001 – 0.01 µm | | Ultraviolet | ~ 0.01 – 0.4 µm | | **Visible** | **0.4 – 0.7 µm** | | Infrared | 0.7 – 1000 µm | | Microwaves | 1 mm – 1 m | | TV / FM radio | ~ 1 m | | AM radio | ~ 100 m | | Long radio waves | > 1 000 m | - Most Earth-observation sensors live in **visible, near-IR, mid-IR, thermal-IR, and microwave** windows.

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