TOMS792 is a FORTRAN77 library which can be used to test the accuracy of programs that interpolate 2D scattered data.
TOMS792 is ACM TOMS Algorithm 792.
The original, true, correct version of this ACM TOMS algorithm is available in the TOMS subdirectory of the NETLIB web site.
TOMS792 is available in a FORTRAN77 version and a FORTRAN90 version.
TOMS526, a FORTRAN77 library which interpolates scattered bivariate data, This is ACM TOMS algorithm 526, by Hiroshi Akima;
TOMS660, a FORTRAN77 library which takes scattered 2D data and produces an interpolating function F(X,Y), this is ACM TOMS algorithm 660, called qshep2d, by Robert Renka.
TOMS661, a FORTRAN77 library which takes scattered 3D data and produces an interpolating function F(X,Y,Z), this is ACM TOMS algorithm 661, called qshep3d, by Robert Renka.
a FORTRAN77 library which
computes an interpolating function to a set of scattered data in the plane;
this library is commonly called CSHEP2D;
by Robert Renka;
this is ACM TOMS algorithm 790.
TOMS886, a FORTRAN77 library which defines the Padua points for interpolation in a 2D region, including the rectangle, triangle, and ellipse, by Marco Caliari, Stefano de Marchi, Marco Vianello. This is ACM TOMS algorithm 886.
You can go up one level to the FORTRAN77 source codes.