In a message dated 8/12/2008 9:56:32 AM Eastern Daylight Time,
I know some of you
all have to be too darn scientific, but my method works every time.
Amen to that. In fact, even with a Physics degree, I have trouble remembering
whether to divide the scale by dpi or vice versa or whether to make one or
the other value larger or smaller to make the image larger or smaller, so I just
stick some numbers into DM, and find the right values by trial and error,
essentially your method.
All the discussion on this convinces me further that it's nonsense that we
keep talking about dpi for digital images of anything, especially maps. dpi only
means anything when the map is printed on a piece of paper. Once scanned (or
produced digitally in the beginning) the scale should be given as feet/meters
(or the ground) per dot (pixel). I wonder when LOC (and the whole graphics
industry) will get into the 21st century and properly identify the scale.
I know that digital files are marked with some dpi which is used when it's
printed, but I'm getting the impression that some programs don't handle this
data correctly and it would be better if it were not indicated in a file.
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