Contours tab

The Contours tab Controls a few additional high-level options for contour lines in the selected overlay layer.

The Overlay Layers' Contours tab

Options

Suppress "Averaging" Filter During Smoothing -

Disable Clipping Polygons - This option prevents the Map Module from using clipping polygons

Hide Clipping Polygons - This option hides clipping polygons so that they don't show up on the map.  This can be useful for plotting out presentation maps.

Color Fill

Color Fill Closed Contour Polygons - This option applies a color fill to all closed contour lines.  This is a simpler version of the Color-Fill Overlay Contours tool, which can handle faults and better work with open contour lines.

Color Fill - This option opens the Color Interval Definition window to set the individual colors and intervals.  

Compute Range - This option opens the Color Interval Definition window to set the individual colors and intervals.  In contrast to the "Color Fill" option, this tool attempts to automatically calculate a range for the displayed contour lines on the Map module.

Contour Sorting - This option selects the sorting order of the contours (Ascending, None, Descending) 

Labeling

Contour Label Size -This option sets the height of the contour label in map XY units.  When this value is set to "0", Petra will automatically calculate a decent value.

Distance Between Labels - This option sets the distance between contour labels in XY units.  When this value is set to "0", Petra will automatically calculate a decent value.

Label Contour if Multiple of - This option sets a multiple for labeling contour lines.  As an example, when this value is set to "5", Petra will only label every 5th contour line. When this value is set to "0", Petra will label all contour lines.

Bold Contour If Multiple of - This option sets a multiple for drawing thicker, bold contour lines.  As an example, when this value is set to "5", Petra will draw every 5th contour line thicker. When this value is set to "0", Petra will not bold any contour lines.

Number of Decimals - By default, Petra trims trailing zeros off contour line labels.  This option instead forces Petra to leave additional decimal points on contour line labels.

Use Line Color  For labels - By default, Petra draws contour line labels in black.  This option instead forces Petra to use the line color.

Hachure Distance - This option sets the distance between hatchures in XY units.  When this value is set to "0", Petra will automatically calculate a decent value.

Hachure Size - This option sets the height of the hachures in map XY units.  When this value is set to "0", Petra will automatically calculate a decent value.