Same for your TIFF: construct a "blank field" with the right number of positions and connections (delta 1 in both dimensions, since it's a pixel map), then in one instantaneous sleight of hand, lift the colors of the TIFF and drop onto this field.
One more item: Map expects the positions of the map and input to overlap (at least partly) but it doesn't care if the numbers of positions match. It wouldn't be much use most of the time if it had the latter constriction.
Replace requires the numbers of positions to match, but it doesn't care if their values are related in any way. (Heck, their dimensionality doesn't even have to match, if I'm not mistaken.)
So the upside of Map is that you can use it when the objects are not perfectly coincident and do not have the same number of positions (but the positions must have the same dimensionality). (If they ARE perfectly coincident and DO have the same number of positions, use Replace).
The upside of Replace is you can Construct your already scaled XY surface (say 100 values of X from -1000-+1000, 100 values of Y from 2500-3500), then take your TIFF of 100x100 positions (whose deltas are both 1, and origins are both 0), and simply Replace the TIFF's colors directly onto the apparently much larger Constructed field. Why does it work? Cause Replace is associating colors by position index ("dep" positions), not by actually location. 100x100 colors snaps nicely to 100x100 positions.
Chris Pelkie Vice President/Scientific Visualization Producer Conceptual Reality Presentations, Inc. 30 West Meadow Drive Ithaca, NY 14850 [EMAIL PROTECTED]
