Assign a Null or NoData value to a lattice above an irregular topography surface in Voxler

KB no longer maintained - Voxler is a retired product. Golden Software retired products are still supported, but no longer receive new features or updates. Many of Voxler's features are moving to Surfer . Please contact support@goldensoftware.com with any questions.
Download the Surfer trial to see how Surfer's new and improved 3D modeling features can streamline your workflow and save you time. For more information, check out these resources:

 

How to assign a null value to a Voxler lattice

Use a Math module with a Boolean IF function to remove data from (blank) the area above a surface.


Attach the 3D lattice as input "A" and a GRD file with the topography as input "B" to the input of the Math module.

Note: The GRD file must be imported as a uniform lattice.


Use an IF function in one of the below formats:

IF Z > B, 0, A 

Or 

Z > B? 0:A

With a GRD file, the elevation data is imported as component 1.

Both statements say to set output value to 0 if the Z value is greater than the elevation data in the GRD file (or "B"). If the Z value is less than the elevation value in B, use the data value in A. In this example, a value of 0 is used, but any value less than the Z minimum of the data can be used.

Connect a VolRender module to the output of the Math module, and set the 0 values to be transparent in the Colormap Editor accessed via the ellipsis button [...] to the right of the Colormap example in the VolRender Property Manager.



Blank a lattice above a GRD surface.

The same principle can be applied to blanking to the right of an X value in a BLN file.  Remove the BLN header, save to a DAT file in Surfer, and grid the DAT file using the X column for the Z value.  In Voxler, attach the Gridder module and GRD file to a Math module as above, and change the reference in the Math equation from Z to X:

X > B? 0 : A



Blank a lattice to the right of an X value in a BLN file.
 
 
 
Updated January 7, 2019
Was this article helpful?
7 out of 20 found this helpful

Comments

0 comments

Please sign in to leave a comment.