The GIS_Area and GIS_Length attributes are special because i) they are not editable and ii) the values are recalculated and updated dynamically as the shape geometry is edited. GIS_Area attribute contains dynamically updated area values for each polygon shape in a polygon layer. GIS_Length attribute contains dynamically updated length values for each line shape in a polyline layer.
The values of these attributes are in the measurement units of the layer.
As with other attributes, the GIS_Area and GIS_Length values can be exported from the Editor's attribute data table, such as to an Excel spreadsheet or database for further processing.