In general, openness scores are based on the format and licensing of the datasets, the comprehensiveness of metadata, and what download options exist.
Dimension 2.2: Online access - Metadata Available Score
This openness element measures whether metadata are available for the published indicators. Metadata must be located in or near the data file or on a designated metadata section of the website. ODIN looks for three aspects of metadata: (1) definition of indicator; (2) date of upload; and (3) Source agency.
Our source for this indicator is Open Data Watch.  Scores range from 0-100.  For more details, consult the ODIN technical documentation.
This openness element measures whether metadata are available for the published indicators. Metadata must be located in or near the data file or on a designated metadata section of the website. ODIN looks for three aspects of metadata: (1) definition of indicator; (2) date of upload; and (3) Source agency.