How this page was created
The main interface for this page is an HTML form. The data that are input into this form are processed by a Perl script. The script reads the inputs, tests for bad inputs and then executes a FORTRAN code that produces a correlation file (in Netcdf). This file is what is processed by a GrADS script. The GrADS script is run as a batch job with the plot created in a virtual frame buffer (to increase the quality of the GIF output). Plot options are input into the GrADS script at this time. The plot in the frame buffer is converted to GIF and this GIF is displayed as part of a HTML document. The netCDF file and the gif file are kept in a directory where the files are periodically deleted.
Feedback
Please let me know if find the page useful. Likewise, let me know if you think any instructions are unclear, if you think there are bugs or if you have any suggestions for improvements of any type. I would particularly like to know if you use these pages for teaching purposes and if so, how. I can be reached by email at cathy.smith@noaa.gov or by phone at (303) 497-6263
Note: Leads and Lags >13 were allowed by the page but not in the instructions. Leads/lags >12 returned correlations a year off. You can now do lags/leads