Download original package (Zip file) - tidpack.zip
Download new software (Zip file), along with sample input data and an explanatory readme file - versatile_tidana.zip.
The IOS Tidal Package is a set of programs, manuals, and test data for analysing and predicting tidal elevation and/or current time series. As listed below, the original package consists of five source-code programs, nine associated sample input files and three manuals. Program output from the sample input should be identical to the results listed in various manual appendices. The analysis programs are designed for time series of up to one year in duration. If your time series are longer than 18.6 years, other programs (not provided here) are available upon request. For time series less than 18.6 years and greater than one year, we recommend that you perform a series of sequential yearly analyses. For time series less than six months, we recommend that you read the manual sections describing inference.
The programs are written in FORTRAN 77 and have been compiled and run on a variety of platforms such as PCs, VAX mainframes, and several types of UNIX workstations. They seem to be fairly free of bugs, as they have been used at a number of sites for some time. However, if you encounter any problems please contact Mike Foreman at email@example.com. Some of the FORTRAN compilers on workstations may require specific options (e.g., to ensure that variables are saved via the ENTRY points in subroutines). We have compiled a partial list of these peculiarities and would appreciate further information from you.
New computer software that permits more versatility in the harmonic analysis of tidal time series has been recently developed and tested. Specific improvements over the methods used in the original IOS Tidal Package include: the analysis of randomly sampled and/or multi-year data; more accurate nodal correction, inference, and astronomical argument adjustments through direct incorporation in the least squares matrix; multi-constituent inferences from a single reference constituent; correlation matrices and error estimates that facilitate decisions on the selection of constituents for the analysis; and a single program that can analyze one or two dimensional time series. A manuscript, presently under review with the Journal of Atmospheric and Oceanic Technology, describes this new software and its evaluation through comparisons with results from old techniques and applications to two problems that could not have been accurately solved with older software. They are: i) the analysis of ocean station temperature time series spanning twenty-five years, and ii) the analysis of satellite altimetry from a ground track whose proximity to land has led to significant data drop-out.
Please contact Mike Foreman if you have any questions.
We appreciate citations to the manuals or JAOT paper if results obtained with the programs are published.
Note: all executables are for a PC, created using Visual Fortran V 6.0.
Please report comments, problems, or bugs to Michael Foreman at Mike.Foreman@dfo-mpo.gc.ca