To Edit the Components of the Mixture Model

This page presents the procedures of the dialog "Create Mixture Component", used to define (create/update) the components to be used in the mixture model.

volta.gif - 199 Bytes Create/Modify a Mixture Model

Creating the Mixture Component:

  • Type in the name of the mixture component. Note that the graphic window shows a plot with zero (0) values for the first component to be defined;
  • in Spectral Signature:, choose between Obtain from Image or Type (see following about each option).

Obtaining Values From Image:

  • in case the option was Obtain from Image, two lists will be presented with a list of images of the model and the other with the values of corresponding pixels;
  • In the main window button Cross Cursor ( ) activate in the SPRING toolbar and click over the image to show the cross cursor. After activating the cross cursor it suffices to click over any point on the image in order to acquire its reflectance value. Note that for each point that you've clicked on the image the graphic window will be updated to show the effect of the new value while the Values list in the Create Mixture Component dialog will also be updated.
  • repeat the last step for every Band in the list on the "Create Mixture Component" dialog.

Type in the Reflectance Values:

  • in case you chose Type, choose the band and type in the Value for the weight, The user may also choose to Normalize the data by clicking on Normalize (0-1). Do not use commas and yes point.

NOTE: For each normalized and typed value of reflectance or Gray Level, the graphic window presents the component curve.

  • still in "Create Mixture Component" you may modify the Visual Characteristics of each Component, so that they will be presented in different colors and shapes in the graphic window;
  • click on Color... to choose one in the Color Selection dialog, and type in a number (38 maximum) for the symbol Size.
  • click on Apply to save the mixture component. Note that the component is inserted in the list Components on the window "Create Mixture Component". Repeat the procedures above to create other components.
  • OBS: Use the button Delete to delete a component from the model, or click on Update... in order to update a component, repeating the same procedures above;
  • click on Save in the "Create Mixture Component" window in order to save the model created.