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satdump/resources/descriptions/NatColor.md
Marhmarchi b5675ac7a1
Update NatColor.md
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Natural color

Natural color is a visible-light enhancement typically used on the Metop and METEOR-M satellites.

It tries to reduce the cyan color caused by ice absorption on the 3a21 enhancement, by combining the 3.74 µm short-wave infrared band.

Appearance

Land appears green (vegetated areas) or yellowish orange (deserts), while the sea appears blue. Clouds appear white. Fog appears whitish-gray.

Intended usage

General purpose imagery in the daytime.

Limitations

Cannot usually be used on NOAA POES satellites as they do not usually transmit channel 3a. Hard to determine the cloud nature. Cannot discriminate between cirrus clouds and fog.