Selecting Property Values from a List
Creating Expressions
Performing a Conversion
Creating a Calculation
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You can use operators and functions to calculate a new value based on existing property values. You can use the resulting value to filter or select data. For example, you can calculate the area of parcels and then select parcels whose areas are above a certain area value.
NoteIn AutoCAD Map 3D, you
can store the resulting calculation as a new property in the Data
Table. The calculated property is stored with the map, but is not
written back to the original data store. To save the property to a
data store, export the layer to an SDF file.
The syntax for calculations varies, depending on whether you use operators or functions.
There are two special calculations you can perform: finding the area of a polygon and finding the length of a linear feature.
NoteYou must be online and
connected to the data store that contains the data for the calculation
in order to create or manage calculations.
NoteFor some calculations,
values do not update automatically because their underlying functions
are not supported by their data providers. Instead, the values display
as read-only properties. If you do not see a new calculated value
immediately, refresh the layer manually. Right-click the layer in Display
Manager and click Refresh Layer.