MERLIN Online (Maryland’s Environmental Resources and Land Information Network) is a one-stop shop for environmental resources data in Maryland. MERLIN Online allows a user to create a map for any location in Maryland, including their choice of base map and user selectable data. Users can point a location on the map and receive information about that site. Another powerful feature of the system is access to information that helps to better understand the data being viewed, such as the origin of the data, how it was created, accuracy and age. MERLIN Online was developed to help users make better informed decisions.