Remote Sensing: Visible spectrum

The light which our eyes - our "remote sensors" - can detect is part of the visible spectrum. It is important to recognize how small the visible portion is relative to the rest of the spectrum. There is a lot of radiation around us which is "invisible" to our eyes, but can be detected by other remote sensing instruments and used to our advantage. The visible wavelengths cover a range from approximately 0.4 to 0.7 μm. The longest
visible wavelength is red and the shortest is violet. Common wavelengths of what we perceive as particular colours from the visible portion of the spectrum are listed below. It is important to note that this is the only portion of the spectrum we can associate with the concept of colours.

􀂄 Violet: 0.4 - 0.446 μm
􀂄 Blue: 0.446 - 0.500 μm
􀂄 Green: 0.500 - 0.578 μm
􀂄 Yellow: 0.578 - 0.592 μm
􀂄 Orange: 0.592 - 0.620 μm
􀂄 Red: 0.620 - 0.7 μm

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