Input grids

SWAN input grids commands

rompy.swan.components.inpgrid.REGULAR	SWAN regular input grid.
rompy.swan.components.inpgrid.CURVILINEAR	SWAN curvilinear input grid.
rompy.swan.components.inpgrid.UNSTRUCTURED	SWAN unstructured input grid.
rompy.swan.components.inpgrid.WIND	Constant wind input field.
rompy.swan.components.inpgrid.ICE	Constant wind input field.