<[EMAIL PROTECTED]> wrote:
> I'm attempting to map wavelength data (of which I know nothing) and keep
> coming into the notation "um" where the u is really the Greek mu. Nobody
> here at our office knows what this means or what it is. We're not
engineers.
> If it helps, the data are thermal images tied to ground truths. Can
anyone
> tell mell what unit of measure "um" is? Further, what does it mean? How
is
> it used? What does it describe?
The Greek letter "mu" is frequently used as a prefix meaning "Micro-", that
is, one
millionth of whatever the base unit is. The only "m" unit I can think of
is "meters".
This would make your measurements in "micrometers", aka "microns".
If your data consists of measured wavelengths of thermal infrared radiation,
this makes sense; these wavelengths are at a scale where micrometers are the
most
convenient unit to use.
HTH
Spencer
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