Semi-transparent overlay

Problems: spatialize compare 

The semi-transparent overlay pattern consists in laying two data layers or images on each other. The upper one is semi-transparent, allowing to view the one under. It differs from the layer pattern : overlays typically contain data covering common parts of the screen, while layers are meant to visualize data that covers complementary areas (e.g. green areas and transport lines). Sometimes, the pattern is complemented by an opacity slider allowing to set the opacity level. See also:


A Game of Shark and Minnow

Ethnicity Trends in the Washington D.C. Area, 2000 to 2010

The Actual NY MTA

Liverpool history plans

Saint-John Baptist X-ray view

Superposition of a painting « Jean le Bapstiste » et de sa photo aux rayons X, avec contrôleur d’opacité sur la gauche