A Survey of Official Online Sources of High-quality Free-of-charge Geospatial Data for Maritime Geographic Information Systems Applications.

As part of the research paper: http://dx.doi.org/10.1016/j.is.2016.11.002
Reference Name Provider Title URL Description Resource Type Data Format Chrono Size Region Country GovermentalShort Time Range Year From Year To Ancient Flag Data Quality Control API Mobile APP URL TermsOfUse Copyright Notes Restrictions To Download Restrictions To Use Restrictions To Redistribute