Classification
The classify WFS feature, as the name implies, works on Web Feature Services, due to their nature in containing attribute values and independent, clickable vector features (as opposed to rasterized images which are fuzzier in nature)
Density Mapping
The density mapping feature provides an option to select a WFS layer on which to calculate kernel density estimation (where a smoothly curved surface is fitted over each point or line feature, and surface values are higher near the clustering of features, and lower as distances increase from those clusters)
Feature Tracking
The tracking tool again takes a web service layer as input, and performs time series-based tracking along the route or direction the selected feature travels as time passes (as an animation)
