Point's X and Y coordinates are on a surface?

Are there any nodes which can tell you if a point’s x and y coordinates are shared by a surface?
I’m copying a surface spot elevation to a grid based on the surface’s max/min x and y coordinates, but I would like to remove the points that are not over the surface:

You could use Surface.ElevationByXY, which would give a null if a point is off the surface. Then you could use List.FilterByBoolMask or List.Clean from there.


Actually ended up using the IsNull node, and a bool filter. Worked like a charm. Thank you!