Changes between Version 44 and Version 45 of requests

Timestamp:

Aug 13, 2009, 11:32:30 AM (17 years ago)

Author:

goddard

Comment:

--

requests

@@ -19 +19 @@
 Should have vop subtract use interpolation like vop add.  Will still
 want to provide exact subtraction of identical grids without round-off
-errors caused by interpolation.
+errors caused by interpolation.  Probably subtract should use the grid
+of the first map and not extend to cover the other maps by default.
+For grids that are not identical, the maps may often come from separate
+sources and a normalization will have to be done.  Could have an option
+to scale second map so deviation from first map is minimum (within second
+map contour level?).  Also may want an explicit second map scaling so
+several copies can be subtracted using the same normalization.  Difference
+maps have rather different requirements and purposes then adding maps.
 </p>