The COSMO/ICON consortium standardized how the "closest grid point" is defined when a station altitude is specified as well. They found that it is important to give substantial weigh to the altitude. I.e., it is better to use a grid point from the next valley that has the same altitude than one from the same valley with a very different ASL:
The COSMO/ICON consortium standardized how the "closest grid point" is defined when a station altitude is specified as well. They found that it is important to give substantial weigh to the altitude. I.e., it is better to use a grid point from the next valley that has the same altitude than one from the same valley with a very different ASL:
200810_pka_GP-allocation_COSMO-Newsletter.pdf
depends on Pull Request #59