Topic:
How to change the contour interval of a grid.

Description:

Solution:
Contour spacing is referred to as the contour interval of the map.  When setting
the contour spacing, you may select from a preset coarse, medium or fine 
spacing, or a custom spacing.  The custom contour spacing allows you to enter 
any desired contour spacing.  By default, every 5th contour is highlighted on 
the map.  (The highlighting interval may be adjusted in later posting.*)

In Basemap, if contours are not currently displayed:
1.) Post > Interpretation; select the survey(s), turn on the 'Horizons' toggle
    and click on the 'Select...' button; select a horizon and attribute to post 
    and click the 'OK' button; click the 'OK' button.

2.) Gridding > Input Data; select input data type of 'seismic horizons' and   
    the 'input feature' and click the 'OK' button; adjust grid and contour 
    parameters as needed and click the 'OK' button.

In Basemap, if contours are currently displayed:
1.) Gridding > Parameters; adjust the contour parameters as desired and click 
    'OK'

2.) Gridding > Regrid/recontour


* To adjust the highlighting contour interval, in Basemap:
  1) Post > Interpretation; select the survey(s), turn on the 'Grids/Contours' 
  toggle and click on the 'Select...' button; 
  2) Select an available contour; click on the 'Display parameters...' button;     3) Under the 'Index contours' section of the menu, set the index increment to    the desired highlight increment, and click 'OK'; 
  4) Click 'OK' in the 'Post Grids and Contours' menu; click 'OK' in 
  the 'Post Interpretation' menu.






Last Modified on: 18-JAN-99