Connected Components Labeling

The labeling of connected elements is used to create a vector representation of an Information Layer, from dynamic segmentation routines, over a raster map, so that the boundaries between the themes in the raster map become well defined. Thus, the map raster edition can be performed afterwards.

How to label an image:

  • activate a thematic or classified image on the "Control Panel";
  • click on Thematic - Connected Components Labeling... for thematic IL or Image - Connected Components Labeling... for image IL;
  • observe that the Input Layer name is presented on the top of the window;
  • click on the Categories list to select an image category that will contain the labeled image;
  • click on the text box Output Layer and type a name for the labeled image;
  • if you wish to Delete areas (polygons smaller than...) on the Input IL (active IL) and/or on the Output IL, type in a value in pixels and click on the correspondent button where the smaller areas will be deleted;
  • click on Yes or No for Arc Smoothing. If you choose Yes, the edges between the contours of the several classes are selected by the vector that will be created between the boundaries. If you choose No, the vectors will follow exactly the contours of the classes.
  • click on Apply to create the labeled image.


See also:
Raster Edition


Editing a Raster Information Layer