Adding attributes to the statistical overlay output

The Primary and Secondary Input layers that you choose for the Statistical Overlay determine the availability of the Grouping Criteria options and the options available under Additional Attributes.

Count

is available when:

• The Primary Input is a line layer and the Secondary Input is a line, polygon, thematic raster, or raster.
• The Primary Input is a polygon layer and the Secondary Input is a point, line, polygon, thematic raster, or raster.
• The Primary Input is a thematic raster layer and the Secondary Input is a point, line, polygon, thematic raster, or raster.

When you enable the Count check box, Focus calculates the number of shapes combined to form each record and adds that attribute the output layer.

Surface Length

is available when the Primary Input is a line layer and the Secondary Input is a raster. This option is useful if the raster is a DEM. When you enable the Surface Length check box, Focus calculates the three-dimensional surface length of the line and adds that attribute the output layer.

Distance

is available when:

• The Primary Input is a point layer and the Secondary Input is a point, line, or polygon layer.
• The Primary Input is a line layer and the Secondary Input is a points layer.

When you enable the Distance check box, Focus identifies the shape from the Secondary Input that is the closest to each shape in the Primary Input and calculates the distance between them. The distance is added to each record in the output layer. When points are contained within the polygon, the distance equals zero in the output.

Counting Specific Pixel Values:

You can count specific pixel values when the Primary Input is a line, polygon, or thematic raster layer and the Secondary Input is a raster. For each line in the Primary Input, Focus identifies corresponding pixels in the Secondary Input and adds that attribute the output layer.

Grouping Criteria:

The Grouping Criteria options are available when the Primary Input is a polygon layer and the Secondary Input is a line or polygon layer.

To combine all shapes from the Secondary Input that touch or overlap the boundaries of each shape in the Primary Input, enable the Partially Within option. The resulting attribute is added to the output layer.

To combine only the shapes from the Secondary Input that lie entirely within the boundaries of each shape in the Primary Input, enable the Wholly Contained option. The resulting attribute is added to the output layer.