Topic:
How to create a depth map using an external velocity file.

Description:
You have an xyz (z is the value of velocity) file and want to read it 
into MapView to create a depth map.

Solution:
XYZ file must be in MapView format.
  Refer to on-line documentation: Geonet > IESX > HELP
  Version 10.2 > Help on IESX Applications > Surface Modeling > ASCII Formats 
        (located at end of the MapView section).


Grid the velocity file

1.) Select > Read XYZ points > External file.
   - Type in path/file and exit.
   - Select Yes to confirm.  A histogram should display. 
	If correct, select Exit or up-arrow.

2.) Save/Update > Update.
   - Type in surface name.
   - Toggle z units to vel (ft/s) or vel (m/s).
   - Toggle save points to yes.

3.) Grid velocity xyz by selecting Edit > Grid Contour > set gridding 
	parameters and exit.


Grid the time horizon:

1.) Select > Horizon, select time attribute.

2.) Grid time horizon by selecting Edit > Grid Contour > set gridding 
   parameters and exit. 


Multiply time and velocity grids

1.) Grid Operations > Combine.

2.) Fill out the next menu as follows:
   - Grid operation toggle to multiply.
   - Scale #1 units leave to none. (defaults to grids units).
   - Scale for Grid #2 (velocity) leave to 1.
   - Scale #2 units leave to none. (defaults to grids units)
   - Scale for Grid #1 (time) type in .5 (compute one-way time)
   - Input Grid toggle to List.
   - Resultant Surface Name, type in name.
   - Final Grid Output
   - Grid #1 Fault Handling and Grid #2 Fault Handling need to be set 
	if you have fault traces.
   - Grid Extent Handling - specify which grid extent to use and exit.
   - Select the velocity grid, select yes to make current data.
   - Select the time grid, select yes to make current data.
   - Select the contour icon to display.





Last Modified on: 24-SEP-98