Contour a Grid

Map: Contours > Contour a Grid...

A computer-generated grid by itself is just a set of numbers that reflect a X coordinate, a Y coordinate, and a Z value. A big part of interpretation is representing this data clearly and concisely with contour lines and color.

For a more general guide, see "How to Make a Contour Map."

MapContourGridDialog

Grid tab	This section defines the grid file that will produce the contours.
Options tab	The Options tab sets how Petra displays grid contour lines and color fills.
Style tab	The Style tab changes how Petra draws and labels grid contour lines.
Advanced tab	Options for more advanced contouring that are important if you need to edit contours and re-grid using the map overlay contours.
File tab	Saves grid contour templates.