The Mensuration Options pane is where measurement units, symbols, and colors are set for each of the different Measurement Types. You can also set the Level of Precision for your measurement types, and choose an Elevation file to increase measurement accuracy.
On the Imagery tab, in the Mensuration group, click Mensuration Options to open the Mensuration Options window.
The Level of Precision value determines the number of decimal places for the specified units; the default value is four decimal places.
Different Symbol types can be selected by clicking on the default symbol for each Measurement Type. The Color can be assigned to the different symbol and measurement types by clicking on the color drop-down arrow and choosing a color from the color pallette or assigning a unique color using the Color Editor.
Measurement accuracy can be increased by assigning an elevation dataset from the file navigation icon. Either an elevation file or the URL address of an elevation service can be specified.