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Hi Steve: I have been working with the GDBIINT program but I have a question. I create a file (i.e. my own file with PROJ=CED and a particular region of the Pacific/West Coast: 29;-161;58;-90). I am trying to interpolate the AVN thinned grids to this new grid. The interior points look fine, but the boundary points have RMISSD values along with some other large negative values in TMPK at 800mb values for example. Did you notice problems in the testing of this routine or is there something that I am missing in using the program? Can one use the program to go from one projection to another with varying resolutions as long as the navigation blocks are defined? I am noticing this problem in converting the ETA grids to this grid as well. However, the NOGAPS grid (CED, global coverage) does not have this boundary problem. Any insight that you could give on this issue I would greatly appreciate. Also, I spoke to David Ovens and he had a bicubic spline routine written (usable by GR_INTP, for example). Thanks again for your help--- Brett Brett Newkirk E-MAIL: address@hidden Office: ATG 424 Atmospheric Science/Geophysics Building Mailing Address: Department of Atmospheric Sciences, University of Washington Box 351640 Seattle, WA 98195-1640 Office Phone: (206) 685-2183