![]() Verify the X coordinates, Y coordinates and Z coordinates columns are specified correctly.In the Contents window, select the Classed Post layer, and in the Properties window click the General tab.In the Surfer plot window, click Home | New Map | Post | Classed Post.The Z column is the column that is used to class the points. Create a data file with X, Y and Z columns. ![]() For example, you could have all points with a low concentration value colored blue square, all points with a medium concentration value a green triangle, and all points with a high concentration value a red circle. Each bin has its own specific symbol properties. A classed post map is a map where symbols are posted at specific XY point locations, and the symbols are divided into bins by a third numeric value.
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