https://grapherhelp.goldensoftware.com/Graphs/Contour_Data_Map.htm
Countour Surface Map, XY Data Maps and XZ Data Maps, with Contour Intervals and Contour Grids
A contour surface data map is a two-dimensional representation of 3D data as: XY data maps and XZ data maps.
surface mapcontour intervalscountourdatamaps
https://www.coordinately.org/learn/contour-lines-and-intervals
Contour Lines and Intervals ยท Coordinately
Contour lines connect points of equal elevation on a topographic map, allowing 3D terrain shape to be read from a 2D image. Charles Hutton drew the first land...
contour linesintervalscoordinately