A respondent on the MapInfo-L list wrote:
<< What is the difference between an image and a Grid? One is derived and one
is imported? Aren't they both just 2D (or more) arrays of numbers? Color
values reference the object. >>
Here is one big difference in my book: Suppose the image is an aerial photo
and the grid is an array of township names in the PLSS. I can apply a JPeg
transformation to the aerial photo to reduce the photo's file size, but JPeg
the file of township names? Hardly.
You can "zip" them both, but I doubt you could reduce the size of an
arbitrary grid with a scheme (like JPeg) that is based on a generalization of
visual features.
Robert Edwards
The MapTools Company
----------------------------------------------------------------------
To unsubscribe from this list, send e-mail to [EMAIL PROTECTED] and put
"unsubscribe MAPINFO-L" in the message body, or contact [EMAIL PROTECTED]
