Objects

Area of classified objects

Map features > Objects > Area of classified objects

The absolute area of all image objects classified as a given class. Default unit is pixels.

Editable Parameters

• Class: select or insert class name

Parameters

• is an image object
• is a given class
• are all image objects classified as
• is the total number of pixels of image object

Expression

Feature Value Range

Area of classified objects in region

Map features > Objects > Area of classified objects in region

The absolute area of all image objects classified as a given class on a given image object level within a region. This feature allows the user to refer to a region and image object level. If the region is not defined (i.e. set to "none") the entire scene extent will be used. Default unit is pixels.

Editable Parameters

• Region
• Class
• Level

Parameters

• is the total number of pixels
• is the given image object level
• is the given region
• is the given class

Expression

Feature Value Range

Area percentage of

Map features > Objects > Area percentage of

The feature divides the area of one class by the area of another class.

Editable Parameters

• Class
• Other Class

Parameters

• is the total number of pixels of class n
• is the total number of pixels of class m

Expression

Feature Value Range

Existence of object level

Map features > Objects > Existence of object level

The feature returns 1 if a defined object level exists and to 0 if it does not exist.

Editable Parameters

• Level name

Histogram of object value

Map features > Objects > Histogram of object value

Calculates the histogram for objects of a selectable class and feature. The output can be written in an array.

Editable Parameters

• Class: select or insert class name
• Feature: select the feature for statistical calculation
• Slots: select the number of slots in histogram
• Type: select the type of the histogram (Frequency or Relative frequency)

Layer StdDev of classified objects

Map features > Objects > Layer StdDev of classified objects

The standard deviation of all image objects of the selected class on a selected image object level.

Editable Parameters

• Class: select or insert class name
• Image layer: select the layer for statistical calculation

Parameters

• is an image object
• is a given class
• are all image objects classified as
• is the mean intensity of layer for image object

Expression

Feature Value Range

Layer Mean of classified objects

Map features > Objects > Layer Mean of classified objects

The mean of all image objects of the selected class on the selected image object levels.

Editable Parameters

• Class: select or insert class name
• Image layer: select the layer for calculation

Parameters

• is an image object
• is a given class
• are all image objects classified as
• is the mean intensity of layer for image object

Expression

Feature Value Range

Number of classified objects

Map features > Objects > Number of classified objects

The absolute number of all image objects of the selected class on all image object levels.

Editable Parameters

• Class: select or insert class name

Parameters

• are all image objects classified as
• is a given class

Expression

Feature Value Range

Relative area of classified objects in region

Map features > Objects > Rel. area of classified objects in region

The relative area in pixels of all image objects of a given class on a given image object level within a region.

Editable Parameters

• Region
• Class
• Image object Level

Parameters

• is the total number of pixels
• is the given image object level
• is the given region
• is the given class

Expression

Class	Area of classified objects	Relative area of classified objects
	11 pixels	11/25 = 0.44
	10 pixels	10/25 = 0.4
	4 pixels	4/25 = 0.16

Feature Value Range

Statistic of object value

Map features > Objects > Statistic of object value

This feature allows the calculation of statistical operators over an existing object’s feature.

Editable Parameters

• Class: select or insert class name
• Statistical Operation (Number, Min, Max, Mean, Sum, StdDev)
• Feature: select the feature for statistical calculation

All existing image object levels

Map features > Objects > All existing image object levels

Returns the names of all image object levels.

Number of objects

Map features > Objects > Number of objects

Returns the number of image objects of the current map.