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If a floating point grid is used as the <source_grid> for COSTALLOCATION, COSTDISTANCE and COSTBACKLINK, an error message similar to the following will appear:
"Grid: costalloc = COSTALLOCATION(srcgrd_flt, costgrd)
Source_grid SRCGRD must be of integer type to be used for allocation values.
Cost Distance mapping Failed
AML MESSAGE - Stopping execution of AML file due to ERROR condition"
The Workstation documentation indicates that the <source_grid> can be integer or floating point for COSTALLOCATION, COSTDISTANCE and COSTBACKLINK. This is not correct.
Floating point grids are not supported as input for the source grid.