Introduction : This calculator calculates the eta coordinate for numerical weather prediction models that use this coordinate system, most notably the "Eta" model (so named because of its use of this coordinate system). The eta coordinates, or levels, create a "step" appearance to the terrain.
This calculator provides the tools needed to explore the relationship between pressure and the eta coordinate.
In this calculator, you have three input values:
The algorithm for the eta coordinate is:

Eta coordinate Calculator 