Software implementations of methods/algorithms for multidimensional interpolation on an irregular grid?

Question

Algorithms

There are environmental parameter measurement data that are unevenly distributed in space and time (for example, temperature measurements are taken in the aquatic environment)
Questions:
1. What interpolation methods are suitable for obtaining intermediate values ​​of this environmental parameter? (From known to me IDW and kriging method )
2. We need a software implementation of the kriging method and others, if any, with the exception of IDW.
Software implementations are desirable in JS or C ++ or C or Perl, but in extreme cases, implementations in any PL are suitable.

Answer 1

Here is the implementation in Python.
https://github.com/bsmurphy/PyKrige
But for such a request, be on c++
kriging interpolation c++