RAS2THMR

Description

RAS2THMR creates a thematic raster layer by creating a linked attribute table for the input raster data. The attribute table includes information about the input raster, such as the unique pixel value, the area covered by each unique pixel value and, when classification metadata is present, class names and descriptions.

Parameters

Name	Type	Length	Value range
InputRaster: Input raster channel *	Raster port	1 - 1
OutputRaster: Output file name *	Raster port	1 -
Create attributes	String	0 - 1	Area Only| Area Perimeter Default: Area Only
NoData value	Float	0 - 1

* Required parameter

Parameter descriptions

InputRaster: Input raster channel

Specifies the input raster channel to be processed.

OutputRaster: Output file name

Specifies the output thematic raster; this consists of a raster and a linked attribute table, stored in a vector segment.

Create attributes

Specifies which attributes to add to the output data.

You can create an attribute table containing either of the following:

• Area Only: Specifies that only attributes for the defined area are added to the output layer. This is the default value.
• Area and Perimeter: Attributes for the defined area and its perimeter are added to the output layer.

NoData value

Specifies a NoData (or background) value for the input channel. Pixels with this value are excluded from processing.

If no value is specified for this parameter, the NoData value for the channel is taken from the input layer metadata.

Details

RAS2THMR creates a thematic raster layer from an input raster layer with an associated attribute table. The attribute table is stored as a vector layer, which is linked to the raster output channel through metadata.

The attribute values can include Area only or Area and Perimeter. These values are calculated based on the pixels of the input raster channel.

If the input raster contains suitable classification metadata, that information is automatically transferred to the appropriate fields in the output attribute table. That is, when the input raster is the result of a PCI classification process, two addtional fields, Name and Description, are created in the output thematic raster.

The segment name and descriptor are created automatically from the input raster file.