Wouldn't make sense for the *spacings to be GridMetricOperations?

[simone-silvestri]

At the moment they are KernelFunctionOperations. However, we have the GridMetricOperation type which would be very well suited for an AbstractOperation describing grid spacings.

[glwagner]

The difference is that GridMetricOperations only have a function when they are used in AbstractOperations like BinaryOperation. But the *spacings can be used stand-alone; for example to plot the grid spacings.

[glwagner]

The GridMetricOperations may be redundant or unnecessary now that the spacings are KernelFunctionOperation. So I would go the other direction and consider eliminating GridMetricOperations.

[glwagner]

I guess the reaosn to keep them around for now is that we don't have areas or volumes, so we still need GridMetricOperation to form abstract operations with areas and volumes.

[simone-silvestri]

we could write areas and volume functions and eliminate GridMetricOperation

[glwagner]

I think ultimately that is the best course of action