Distance To Edge
Calculates the geographic distance between two geometries, including geometries within geometries, as follows:
 Points—Returns the distance between the two points.
 Lines—Returns the shortest distance between the two lines.
 Polygons—Returns the shortest distance between the two polygons. For example, if the polygons are two lakes, the distance would be between the two closest shores.
 Geometry within Geometry—Returns the shortest distance between the two geometries with a positive distance value.
Option Name  Description 

Distance units  Specifies the unit of measurement to use to calculate the distance. One of the following:

Geometry 1 field  The field that contains the geometry to compare with Geometry 2 to determine the distance between them. This field also accepts geometries that are generated by stages in the Enterprise Routing Module, such as a LineString or Polygon. 
Geometry 2 field  The field that contains the geometry used to calculate the distance to edge to Geometry 2 This field also accepts geometries that are generated by stages in the Enterprise Routing Module, such as a LineString or Polygon. 
Distance to edge field  The name of the field that you want to contain the distance to edge returned by Spatial Calculator (output type is double). 