Literature, most generically, is any body of written works. More restrictively, literature writing is considered to be an art form, or any single writing deemed to have artistic or intellectual value, often due to deploying language in ways that differ from ordinary usage.
Information from a dedicated calibration and validation site has proven invaluable in ensuring the accuracy of satellite altimetry measurements. However, more reliable in situ information can be obtained by an international network being developed within an EU-funded project.