Review & document data access mechanisms and user facing portals for precursor/major telescopes

Precursor and other major telescopes have a variety of user facing portals and data access mechanisms available. The useability of such portals and accessibility of the data makes a huge impact on the quality and quantity of science goals achieved. One clear example is the Sloan Digital Sky Server, with the most publications from a science collaboration and consistently the most cited telescope, where their success is widely reported as being due to the ease of access of their datasets, and the wide variety of tools available through their website to investigate and process data.  This feature looks at writing down some of the most notable features from the access portals of successful telescopes & precursors, in order to define what will enable users to have the best experience.