Let grdcut -E extract a vertical slice from a 3-D cube #7961
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If you have a 3D cube it is nice to get a vertical slice grid out for some given x or y value. grdinterpolate -R does this by point and via grdtrack so it is slow. If n_layers are equidistantly spaced then it is simple to extract a grid.
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grdcut -Ex|ycoord lets users extract a vertical slice grid that is either parallel to the x or y direction and goes through the specified coordinate. For example,
gmt grdcut my cube.nc -Gslice.nc -Ey33will cut along the row corresponding to y = 33. For grdcut we require the cube be equidistant in the 3rd dimension, and that coord is a node coordinate so there is no resampling here, just picking the nodes along that slice. Once tested I will add this to grdinterpolate where, if -T is set and coord does not necessarily fall on a node,. we will resample by providing the coordinates for the output grid.