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ICS

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ICS is a fundamental parameter in the fort.15 file that defines the coordinate system and the desired projection. The value of ICS also has an important consequence for the choice of the Coriolis CORI parameter of the fort.15 file.

Available ICS Values

ICS Value Short-name Description
1 Cartesian Points in the fort.14 are already mapped onto an arbitrary Cartesian coordinate system, e.g., UTM. Also useful for idealized problems.
2 Geographic, CPP, no curvature Points in the fort.14 are specified in geographic coordinates, which will be projected using the CPP (equidistant) cylindrical mapping by ADCIRC. The curvature of the Earth is not accounted for.
20 Geographic, Equal-area Points in the fort.14 are specified in geographic coordinates, which will be projected using the Equal-area cylindrical mapping by ADCIRC. The curvature of the Earth is correctly accounted for.
21 Geographic, CPP Points in the fort.14 are specified in geographic coordinates, which will be projected using the CPP (equidistant) cylindrical mapping by ADCIRC. The curvature of the Earth is correctly accounted for.
22 Geographic, Mercator Points in the fort.14 are specified in geographic coordinates, which will be projected using the Mercator (conformal) cylindrical mapping by ADCIRC. The curvature of the Earth is correctly accounted for.
23 Geographic, Miller Points in the fort.14 are specified in geographic coordinates, which will be projected using the Miller cylindrical mapping by ADCIRC. The curvature of the Earth is correctly accounted for.
24 Geographic, Gall-Stereographic Points in the fort.14 are specified in geographic coordinates, which will be projected using the Gall-Stereographic cylindrical mapping by ADCIRC. The curvature of the Earth is correctly accounted for.

The values 20-24 can also be set to a negative value to implement an arbitrary rotation of the geographic coordinates by ADCIRC. This is primarily used to ensure that Earth's poles are rotated onto land to eliminate the singularity in the Spherical coordinate form of the governing equations. ADCIRC's outputs will be displayed on the original unrotated coordinate system.