Datamine Discover KB - Data Processing

How to create synthetic survey lines in Encom PA

Josh Knight — Wed, 17 Oct 2007 04:46:25 GMT

There are two methods for creating synthetic survey lines in Encom PA.
1. Use the Flight Path Simulator plugin utility accessed from the Processsing menu. This plugin will create a series of flight survey lines based on a grid image file, typically a terrain grid.
2. Use the Feature Manager utility to digitise individual lines with the polyline drawing tool. Then use the Feature Exporter utility, accessed from either the Conversion menu or the Feature menu, to export the lines to a Geosoft database (.GDB).

How can I clip a grid image to a specified X and Y coordinates or a polygon?

Josh Knight — Wed, 17 Oct 2007 00:57:16 GMT

To clip a grid image to the bounds of a polygon vector file or X and Y coordinate extents open the Grid Utilities plugin from the Gridding menu and choose the Clip option from the Utlities button drop down list.
If the grid being applied to this process is not already loaded into the current session of Encom PA click on the Open button (yellow folder) at the top of the Grid Utilities dialog and browse to it's location. Once the grid is loaded it will be highlighted in the grid list at the top of the dialog.
In the Clipping Type section choose between a Rectangular or Polygonal Clipping Region. For a Rectangular clipping region specify the Minimum and Maximum X and Y values from the entry boxes available. For a Polygonal clipping region click on the Open vector file button (yellow folder) located near the bottom of the dialog.
Note: If a Feature Database is loaded in the current session the Feature database option will also be available for using a polygonal feature object as the clipping region.
Click the Update button at the bottom of the dialog to preview the clipped grid. Then when satisfied with the output select the Save As... button at the bottom of the dialog and specify a name for the resultant grid image file.

How can I clip a grid image to the bounds of another grid image?

Josh Knight — Wed, 17 Oct 2007 00:40:57 GMT

To clip a grid image to the bounds of another grid image open the Grid Utilities plugin from the Gridding menu and choose the Grid To Grid Clip option from the Utlities button drop down list.
If the grids being applied to this process are not already loaded into the current session of Encom PA click on the Open button (yellow folder) at the top of the Grid Utilities dialog and browse to their file location. Once the grids are loaded they will be listed in the Input grid: and Clip to grid: drop down lists. Nominate from each of these lists which file is the grid to be clipped and which is the grid that the other grid will be clipped to. Click the Save As... button at the bottom of the dialog and specify a name for the resultant grid image file.

How can I merge two or more grid images into one?

Josh Knight — Wed, 17 Oct 2007 00:25:20 GMT

To merge two or more grid image files into one access the Grid Utilities plugin from the Gridding menu and choose the Merge option from the Utilities button.
If the grids have not already been loaded into the current session open them by selecting the Open button (yellow folder) at the top of the screen.
The grids will then also be added to the Grid: drop-down list. Select each grid individually from this list and click the ADD button after each selection. The grids will then be added to the "Grids to merge" section.
The method for how the overlapping grid cells will be handled during the merge process is set to Average by default. Choose between this method or using the Minimum, Maximum and Sum options listed.
Click the Save As... button in the bottom right hand corner to enter the name of the resultant merged grid.

How do I export a subset of lines or fields from a database?

Josh Knight — Fri, 10 Aug 2007 02:56:33 GMT

Create a subset of data from a database by using either the Line Data Export (Line Exporter) or Database Maintenance (Modify GDB) plug-in utilities available from the Processing menu.

Note: To create a Geosoft database (.GDB) from the original dataset use the Database Maintenance (Modify GDB) utility. To create an ASCII (.CSV) file from the original dataset use the Line Data Export (Line Exporter) utility.

How can I add a new projection coordinate to the projection list in one of Encom PA's transform utilities?

Josh Knight — Tue, 22 May 2007 07:18:32 GMT

Locate the ENCOM.PRJ projection text file in the following location:
C:\Program Files\Encom/Projections
and open it in a text editing program (eg. Notepad). Add the projection string, such as:

"--- Australian Map Grid (AGD 66) ---"
"AMG Zone 54 (AGD 66)\p20254", 8, 12, 7, 141, 0, 0.9996, 500000, 10000000

and resave the ENCOM.PRJ file in the same location.