The Create Geology Multi-File tab of the C Tech Data File Creation and Launch Window will automatically select appropriate fields if the naming of each field follows the following guidelines. In all cases field name capitalization can be upper or lower case. If parts of a word are shown in bold, only that portion of the word must be present at the beginning of the field name.
X coordinate field should begin with X or Easting.
Y coordinate field should begin with Y or Northing.
Z coordinate field should begin with Z, Elevation Top, Ground or Grnd. Note that GMF files cannot use depth below ground surface. Z coordinates must be elevations.
GMF file creation is different and more complex than all other file types because there is no simple table or view that can contain multiple GMF surfaces. This is due to the fact that GMF surfaces do not necessarily contain the same number of points or locations.
The first step is to select the table or view that represents the ground surface or first surface of your model. For example, if you are modeling groundwater contamination, your first surface may be the water table or top of the aquifer instead of ground surface.
At this point, select your fields (if they are not correctly set automatically) and choose (or type) an appropriate Material Number and Material/Surface Name.
Click on the Begin New GMF File button and type the name of the .gmf file you wish to create.
Once you specify the data file name, it will prompt you to ask:
Water table data is unique from a hierarchical geologic data file because the surfaces are not required to be in a top to bottom (non-intersecting) order. If you are defining a 3D geologic model, choose No.
At this point a message box will confirm:
The next step is to select each subsequent geologic surface and append each of these to the new file you just created. To do so, select the new view or table and select your fields (if they are not correctly set automatically) and choose (or type) an appropriate Material Number and Material/Surface Name. Note that if this is the second surface of a 3D geologic file, the material numbers and names for the top and second surface should be identical.
Upon clicking Append to Current GMF File, a message window will confirm:
The procedure for the third and any additional surfaces is identical. The only difference is that you should select your fields (if they are not correctly set automatically) and choose (or type) an appropriate new Material Number and Material/Surface Name as shown below.
Upon clicking Append to Current GMF File, a message window will confirm:
Once you have added all the surfaces, click on the Finalize and Create GMF File button and the following window will confirm:
This last step closes the file and adds the "end" command. This process creates a GMF file that is well commented and identifies the source of the surfaces that comprise it. Click here to view most of the file created above.