Differing Z values between crosshair 'hover' and status bar

[John Horrigan]

Good evening. I have an XYZ surface plot based on imported data from an excel spreadsheet. There is no scaling (at least none that I have asked for) applied to any of the data.

When I activate the crosshair cursor with the 'hover over' display option, I notice that the values for X and Y match what is in the status bar. The value for Z, however, does not. I suspect there is either a form of scaling that I can't control or interpolation that I can't see going on. It appears as though the value in the pop up window is actually more accurate than the the one on the status bar, so whatever is going on is affecting the Z in the status bar.

Any thoughts as to what might cause this and how I might correct it?

Thanks
-John

[DPlotAdmin]

John,
There's nothing to correct; you're just looking at two different things. The popup window you see contains the exact X,Y,Z coordinates of the data point that the mouse pointer is closest to. The status bar entry shows an interpolation of Z for the current mouse pointer position (which may be but generally isn't exactly at a data point). If you select Options>Contour Options and check "Borders" it may be more apparent to you what is going on here.

Edit:
1) Input data points are at the vertices of the triangles when you check "Borders".
2) The interpolated Z value is based on the planar equation for the triangle within which the mouse pointer resides.