SIGCLAS

Maximum Likelihood Classifier

Environments	MODELER
Batch Mode	Yes
Sections	Description Ports Port Details Parameters Parameter Details Details

Description

Performs either parallelepiped or maximum likelihood single-class classification on image data, for up to 254 classes. The output is a theme map directed database image layer of the highest order of probability.

Ports

In/Out	Name	Caption	Type	Min. - Max. Layers	Connection
In	Input	Layers to be Classified	SIG	1 - 256	Mandatory
In	Mask	Area Mask	Bitmap	0 - 1	Optional
Out	Output	Classified Layer	Raster	0 - 1	Optional

Port details

Input: Layers to be Classified

Contains the input layer(s) consisting of the class signatures (type 121) to be used in the classification.

Mask: Area Mask

Contains the input bitmap layer that indicates the area under which the input layers should be processed. If no bitmap is provided the entire layer is processed.

Output: Classified Layer

Contains the output layer that will receive the classified data.

Parameters

Name	Caption	Type	Data Range	Default	Optional
MLCStrategy	Classifier	Text	Parallelepiped, Ties, Full, MinimumDistance	Parallelepiped	No
NullClass	Null Class	Text	YES, NO	YES	No
Report	Report Mode	Text	LOG, SIGCLAS.RPT, DISK, OFF, <user-specified filename>	LOG	No

Parameter details

MLCStrategy: Classifier

Valid Values: Parallelepiped, Ties, Full, MinimumDistance Default value: Parallelepiped

Specifies the type of classifier. There are four options:

NullClass: Null Class

Valid Values: YES, NO Default value: YES

Specifies whether pixels can be assigned to the NULL (value 0) class. This parameter is only used during a full maximum likelihood classification (that is, when MLCStrategy = ''Full'').

Report: Report Mode

Valid Values: LOG, SIGCLAS.RPT, DISK, OFF, <user-specified filename> Default value: LOG

Specifies the file to which the generated report will be appended. In addition to the options available from the pull-down menu, the user can enter a filename (max. 64 characters).

Details

A bitmap specifies the area within the ''Input'' layer which will be processed. Only this area will be filtered and the rest of the image will be unchanged. If no bitmap is connected, the entire database is processed.