Sampling

Sampling is an interactive process of selecting training pixels in a sample set prior to an image classification.

In the sample set editor, select pixels that are characteristic for a certain type of a certain natural resource on the ground and that have similar spectral values in the maps in the map list, and assign a class name to them. The spectral values of these sampled pixels or training pixels provide the basis on which decisions are made during classification. These values can be inspected in the sample statistics of a certain class of training pixels and can be visualized in feature spaces. The result of Sampling is a filled sample set.

To start sampling, double-click the Sample Map item in the Operation-list, or choose Image Processing, Sample on the Operations menu in the Main window. After creating a new sample set or specifying the name of an existing sample set, the sample set editor is started.