Applying Mixture Model

The mixture model is a component that implements a raster decomposition using the mixture model strategy. The spatial resolution of remote sensing satellites, in general, allows that a single pixel contains more than a target (for example vegetation + shadow + soil). The mixture model algorithms allow decomposing the raster into fraction images, where the value of the resultant pixels indicates the fraction of each target inside the pixel.

The main information needed to execute a mixture model are:

Select PROCESSING → RASTER PROCESSING → MIXTURE MODEL in the main menu.


Selection of the layer with the desired raster (Layer Search)

On the List of Layers select the raster layer to apply the Mixture Model.

Optionally use Filter By Name field giving part of the layer name to help find the layer in the list.

Press the Next button to go to next step or the Cancel button to close the dialog.


Mixture Model parameters

Type - Select the Type of mixture model to be used and set specific parameters (the parameters will vary depending on the selected contrast type).

Options

Create error images: indicate that output raster will include the error bands.

Raster Bands Tab: Select the input Bands and the Sensor information for each band.

Components Tab: it lists the Names and the Values (one for each band) of the components acquired over the image (for example samples of soil, water and shadow). The number of components (samples) and bands must be the same.

Use tool to enable the acquisition of components (samples) through the interface Raster Navigator. This interface offers several tools (such as zoom, color composition) to help on collecting good samples.

Use tool to import a .json file.

Use tool to export a .json file.

Use tool to remove undesired samples from the list.

Spectral curves: click on Selected to see only selected curve or click on All to see all curves on the chart..

To customize chart click on the Graphic Style button.

Press the Next button to go to next step.

Output information

Raster Info - First press and inform the folder where the resulting file will be saved.

Name - inform the raster name.

Extra Parameters - if there are some.

Press the Finish button to save the resulting raster.