Here is a list of all documented modules with brief descriptions:

[detail level 12]

▼Nbicubic_interp_mod	Bicubic interpolation routines for scalars and vectors
Cinterpolate_bicubic
▼Nbilinear_interp_mod	Bilinear interpolation routines for scalars and vectors
Cinterpolate_bilinear
▼Nbudget_interp_mod	Budget interpolation routines for scalars and vectors
Cinterpolate_budget
Nearth_radius_mod	Determine earth radius and shape
Ngdswzd_c_mod	Module that contains C wrapper for routine gdswzd()
▼Ngdswzd_mod	Driver module for gdswzd routines
Cgdswzd
Nip_constants_mod	Module containing common constants
▼Nip_equid_cylind_grid_mod	Equidistant cylindrical grib decoder and grid coordinate transformations
Cip_equid_cylind_grid
▼Nip_gaussian_grid_mod	Gaussian grid coordinate transformations
Cip_gaussian_grid
▼Nip_grid_descriptor_mod	Users derived type grid descriptor objects to abstract away the raw GRIB1 and GRIB2 grid definitions
Cgrib1_descriptor	Descriptor representing a grib1 grib descriptor section (GDS) with an integer array
Cgrib2_descriptor	Grib-2 descriptor containing a grib2 GDT represented by an integer array
Cinit_descriptor
Cip_grid_descriptor	Abstract descriptor object which represents a grib1 or grib2 descriptor
Coperator(==)
▼Nip_grid_factory_mod	Routines for creating an ip_grid given a Grib descriptor
Cinit_grid
▼Nip_grid_mod	Abstract ip_grid type
Cgdswzd_interface
Cinit_grib1_interface
Cinit_grib2_interface
Cip_grid	Abstract grid that holds fields and methods common to all grids
Coperator(==)	Check equality
Nip_grids_mod	Re-export the individual grids
Nip_interpolators_mod	Top-level module to export interpolation routines and constants
▼Nip_lambert_conf_grid_mod	Lambert conformal grib decoder and grid coordinate transformations
Cip_lambert_conf_grid
▼Nip_mercator_grid_mod	GDS wizard for mercator cylindrical
Cip_mercator_grid
Nip_mod	Top-level module for the ip library which re-exports public routines such as ipolates, ipolatev, and gdswzd
▼Nip_polar_stereo_grid_mod	GDS wizard for polar stereographic azimuthal
Cip_polar_stereo_grid
▼Nip_rot_equid_cylind_egrid_mod	Rotated equidistant cylindrical GRIB decoder and grid coordinate transformations for Arakawa grid E
Cip_rot_equid_cylind_egrid
▼Nip_rot_equid_cylind_grid_mod	Rotated equidistant cylindrical GRIB decoder and grid coordinate transformations for Arakawa grids A through D
Cip_rot_equid_cylind_grid
▼Nip_station_points_grid_mod	Interpolate gridded data to a series of station points
Cip_station_points_grid
▼Nipolates_mod	Top-level driver for scalar interpolation interpolation routine ipolates()
Cipolates
▼Nipolatev_mod	Top-level driver for vector interpolation interpolation routine ipolatev()
Cipolatev
▼Nneighbor_budget_interp_mod	Interpolate scalar fields (neighbor)
Cinterpolate_neighbor_budget
▼Nneighbor_interp_mod	Interpolate scalar fields (neighbor)
Cinterpolate_neighbor
Npolfix_mod	Make multiple pole scalar values consistent
▼Nspectral_interp_mod	Interpolate spectral
Cinterpolate_spectral
Cpolates4
Cpolatev4