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Interpolation Library

The NCEP general interpolation library contains Fortran 90 subprograms to be used for interpolating between nearly all grids used at NCEP. The library is particularly efficient when interpolating many fields at one time. It also contains routines for spectral transforms and other processing, including those previously contained in the NCEPLIBS-sp library.

This is part of the NCEPLIBS project.

There are currently six interpolation methods available in the library:

  • bilinear
  • bicubic
  • neighbor
  • budget
  • spectral
  • neighbor-budget

For full documentation see https://noaa-emc.github.io/NCEPLIBS-ip/.

To submit bug reports, feature requests, or other code-related issues including installation and usage questions, please create a GitHub issue. For general NCEPLIBS inquiries, contact Ed Hartnett (secondary point of contact Alex Richert).

Authors

  • NCEP/EMC Developers

Code Manager: Alex Richert

Prerequisites

This package requires a BLAS/LAPACK library to provide several LU decomposition-related routines, and requires CMake (version 3.15+) to build. In spack-stack, OpenBLAS will be used as the provider of BLAS/LAPACK routines for all compilers.

Installing

mkdir build
cd build
cmake -DCMAKE_INSTALL_PREFIX=/path/to/install /path/to/NCEPLIBS-ip
make -j2
make test # (or ctest --verbose)
make install

Usage

Most routines and any public interfaces required can be accessed by adding use ip_mod to your Fortran code. Most spectral transform and processing subroutines can be accessed by calling them in your code (no use statement) and linking to the ip library at build time.

Disclaimer

The United States Department of Commerce (DOC) GitHub project code is provided on an "as is" basis and the user assumes responsibility for its use. DOC has relinquished control of the information and no longer has responsibility to protect the integrity, confidentiality, or availability of the information. Any claims against the Department of Commerce stemming from the use of its GitHub project will be governed by all applicable Federal law. Any reference to specific commercial products, processes, or services by service mark, trademark, manufacturer, or otherwise, does not constitute or imply their endorsement, recommendation or favoring by the Department of Commerce. The Department of Commerce seal and logo, or the seal and logo of a DOC bureau, shall not be used in any manner to imply endorsement of any commercial product or activity by DOC or the United States Government.