ArcMap: Maximum Sample Size

Error Message
Symbolizing using graduated colors or graduated symbols in ArcMap returns the following error:

“Maximum sample size reached. Not all records are being used. Use this sample or change maximum sample size.”

The sample size for the data exceeds the maximum sample size specified in the Symbology tab.

Solution or Workaround
Right-click the layer in the table of contents and click Properties.
Click the Symbology tab and click Quantities in the Show box.
Symbolize the data with graduated colors or graduated symbols.
Click the Classify button to display the Classification dialog box.
Click the Sampling button.
Set the maximum sample size to any number greater than or equal to the amount of features in the layer.
Click Apply.
Click OK.

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