Creating Voxler Vector Maps from Surfer Grid FilesNewsletterHome

Several customers have questioned how to make a vector plot in Voxler. A vector plot can be created from a lattice that contains 3 components or it can be created from a data file. The data file requires six data fields: X, Y, Z and 3 components. The component fields should be ordered with first the X component of the vector, then Y component, then Z component. Once the data file is created, you can use the File | Load Data command in Voxler. After the file is imported, you can right click on the data module and choose Graphics Output | VectorPlot to create the map. The data file can be created in any spreadsheet program. If you have just XYZ data, it can be rather tricky to calculate the vector component columns. The component columns tell the vector the slope, magnitude, and direction of the vectors. This article discusses a way to create this information using our Surfer program. This article assumes that you have Surfer and Voxler and that you are gridding the data in Surfer. If you do not currently own Surfer, you may want to download a copy of the demo version. Creating the Grid File and Exported Data File in Surfer Your original data file should contain 3 columns of data: X, Y, and Z information. For this article, I am using the demogrid.dat data file located in the Samples directory of the Surfer program. This process should work with any data file. If you already have a grid file created, you can skip to step 2. Worksheet Data Manipulation Some background may be warranted about the slope and aspect calculations that were performed in steps 2 and 3 above and how they relate to the vector directions. The terrain slope and aspect calculations are given for the gradient direction. Surfer determines which direction has the steepest slope (gradient) and then performs the calculations on that direction. The slope is reported in degrees with zero being horizontal and 90 being vertical. The aspect is a bearing direction that is perpendicular to the contour lines on the surface, and is exactly opposite the gradient direction. The aspect is also reported in degrees with zero being north and 90 being east. It is necessary to convert the aspect bearing direction to a geometric direction where zero is along the positive X axis. This is done below in the transform steps by subtracting the Aspect from 90. Vectors are a combination of aspect and slope. Creating and Editing the Vector Plot in Voxler After the data is arranged, creating the vector plot is a straightforward process. Open the Voxler program. A new plot window is automatically created. Multiple items can be changed for a vector plot. You can add other map types to enhance the display of the vectors. Your vectors can also indicate a different item than the other maps. For instance, you may have a map that shows vectors of water direction, contours of elevation, and an isosurface that shows chemical concentration. As long as the XYZ values are in the same range for all data, they will overlay to create an informative map. You can add axes, bounding boxes, etc. to create the final desired image. Golden Software's products give you the best value for your money out of any software on the market. Zivko Terzic Geophysicist Copyright © 2016 Golden Software, LLC. All rights reserved. The names and logos for Surfer, Grapher, Voxler, MapViewer, Didger, Strater and Golden Software are registered trademarks of Golden Software, LLC. Source.


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Last Modified: April 22, 2016 @ 8:03 am