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Allison

Ternary Diagrams

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Trying to contour a ternary diagram and contours don't match the Z values posted in the data file. Legend shows weird range of numbers that don't match data file. Granted, I only have four data points.

 

Attached are the data file and the 2D output. The data is related to geotechnical testing (plasticity) of filter cake using percentages of beneficiation, digestion and lime mud

 

Is there anything I can do to get better contours?

filter cake_plasticity.rwdat

Jadar tailings_plasticity ternary_w contours.Rw2D

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Hi Allison,

 

To contour the Plasticity values in your ternary diagram,

  • Digitize the points XY locations on the diagram and copy to the Utilities datasheet.
  • Create a grid and contour map.
  • Draw a polygon that matches the triangle axes on the ternary plot.
  • Click on it to select it, then right-click and Save to Polygon Table.
  • In Utilities, choose the Grid | Filters | Polygon Clip menu command and replace the values outside the triangle with NULL values.
  • Overlay the ternary plot axes and points as needed.

Regards,

Tom B

RockWare Inc

2019-07-24_16-35-41-107.png

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Thanks, Tom! When I try this the grid doesn't clip entirely within the polygon (see attached). I used the null value under Filter type/Exterior and I used the triangle vertices to build the polygon. Is this a gridding algorithm issue or something else?

 

Allison

plasticity ternary_w contours.Rw2D

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Hi Alison,

 

It looks like your cell size is pretty big, resulting in a low resolution grid of about 10 cells in each direction. I used a cell spacing of 10, resulting in 101 cells in the X direction and 87 cells in the Y direction.

.TernaryContoursCellSize.png

Compare contour maps with different grid cell spacing / size / number.

 

Regards,

Tom B

RockWare Inc

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