Supervised Classification in Erdas Imagine
First, set Preferences to find out Input and Output Directory.
Launch Erdas Imagine software, Click File button > Preferences. Preferences pane appears, expend IMAGINE Preferences, then expand User Interface, and select User Interface & Session.
Now Reset Data Directory and Output Directory, click Save and close.
Add Layer or Data to perform Supervised Classification.
Follow the next step, select Drawing Tab > Insert Geometry group > select Grow, and also select Lock.
Now Identify any particular Land Feature for your Eye Estimation. Just click it and show the result.
The next step is to open the Signature Editor.
Select Raster menu, expand Supervised, and choose Signature Editor.
Delete all selected Signatures or class(class 1 – class 14), except the Marge Class (class 15).
Right-click all the selected class and click Delete Selection.
This Satellite image finds out 5 features- (i) Water bodies (ii) Agricultural land (iii) Vegetation (iv) Build up and (v) Marshy land
Change the Value and Order column serial wise.
Now Finally perform Supervised Classification. Expend Classify in the Signature Editor and select Supervised.
Supervised Classification window appears, select output Destination and Name.
Also, you can check it in the Output Distance file checkbox to create error data. This error data helps us with the accuracy level of the supervised image.
Select Decision Rules one by one. (i) Non-parametric Rule – Parallelepiped (ii) Overlap Rule – Parametric Rule (iii) Unclassified Rule – Parametric Rule (iv) Parametric Rule – Maximum Likelihood.
Complete all the step click OK button.
In Erdas Imagine open 2 window viewer (i) Raster Image (satellite image) (ii) Supervised Classification Image