How do I populate/update vector data with values from a gridded surface?


Some examples of use:

- Updating regional RAB drillhole collar locations with accurate RL's from a topographic grid surface provided by a geophysical contractor
- Assigning geological, regolith or tenement polygons mean or maximum copper assay vlaues from an underlying gridded geochemical surface (created using IDW interpolation) as part of prospectivity mapping


1/. Ensure that the vector data table has the necessary numeric field/s to capture grid data into, using the Table>Maintenance>Table Structure tool. For example, if populating a drillhole collar table with RL values from a DEM grid, create an 'RL' or 'Elevation' field with a Float type.

2/. Open into a map window both the vector table to update, and the source grid.

3/. Select the vector data to update, using either a graphical selection tool (to select a subset of the vector data), the Select All menu option in the ELC (to select all objects in the vector table), or a Query.

4/. Open the Surfaces menu (Discover>Surfaces menu) and select the Assign Values from Grid option.

5/. If updating point data (a one to one relationship), the following dialog will prompt for a destination field (e.g. the RL field example in step 1).

6/. If updating polygon or polyline data (i.e. a many to one relationship: for example, populating tenement polygons with the average  values from a regional copper soil sampling grid), the dialog will prompt for destination fields for Average, Minimum and Maximum values. The user can specify one or multiple of these output calculations.

7/. Press OK to run the calculation. The results can be viewed by opening a browser window of the vector table, and scrolling to the destination field/s.

8/. Select File>Save Table and select the updated vector table to make these changes permanent.

Would you like to...

Print this page Print this page

Email this page Email this page

Post a comment Post a comment

Subscribe me

Remove Highlighting Remove Highlighting

Edit this article

User Opinions (0 votes)

No users have voted.

How would you rate this article?

Thank you for rating this article.

Related Articles

No related articles were found.


No attachments were found.

Last Updated on: 1st of September, 2009