[mapserver-users] What does scale mean?

[Stephen Woodbridge]

OK, this may seem like a dumb question, but it occurs to me that I don't
think I know what scale means in MapServer context.

For example, if I am displaying a map file with units METERS and my
Scale is 1:1000 how are SCALE, UNITS, PIXELs related? What if my units
are DD?

TIA,
  -Steve