For the most precise results, use a field of type double, with the desired number of decimal places.
Alternatively, you can project the data source.Ĭalculate Geometry works with any numeric or text field. If the data source uses a geographic coordinate system, such as WGS 1984, and is therefore unprojected, you can use the projected coordinate system of the data frame to perform the calculations.
You can only calculate the area, length, or perimeter of features if the coordinate system being used is a projected coordinate system. Geometry calculations in ArcGIS are planimetric-in other words, they take place in projected space, not spherical or geodesic space. You can only calculate z-coordinates and 3D measurements of a feature if the feature is z-aware. Geometric properties that can be calculated for specific types of features Note: The following table shows the geometric properties you can calculate for different types of features: In addition, if one or more records are currently selected, only the selected records are calculated. You can use the coordinate system of the data source or of the data frame when performing calculations. If you're working with an attribute table of a feature layer, you can easily calculate the area perimeter 3D perimeter length 3D length coordinates of the centroid coordinates of a point minimum and maximum z-values or coordinates of a start, end, or midpoint using the Calculate Geometry dialog box. Performing calculations on feature geometry In addition, you can calculate area, length, perimeter, and other geometric properties on fields in attribute tables. Field Calculator in ArcMap lets you perform simple as well as advanced calculations on all or selected records. In some cases, you might want to perform a mathematical calculation to set a field value for a single record or even all records. Advanced calculations with the Field CalculatorĮntering values with the keyboard is not the only way you can edit values in a table.Reasons the Field Calculator might be disabled.Performing calculations on feature geometry.
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