Atlas Handbook

Data fields

What each field means and which values it accepts - for reading the map closely and for reusing the data honestly.

  • Antarctic data fields

    What the Antarctic layers commit to when they call something conjectured, reported, observed or drawn by us.

    antarctica · reviewed 2026-08-23

  • Crusades data fields

    What the Crusades layers commit to when they say a stage, a route, a claim, a possession or a centre.

    crusades · reviewed 2026-08-25

  • Dacia data fields

    The fields the Dacia layers expose as filters, in reader's language - what each value commits to, and what it does not.

    dacia · reviewed 2026-08-23

  • Hanseatic data fields

    Participation classes, evidence types and certainty - the vocabulary that lets the Hanseatic layers show how well attested each thing is.

    hanseatic · reviewed 2026-08-23

  • Venetian Maritime Network data fields

    What a port's status, a route's type and a possession's phase each commit to - the vocabulary that makes the VMN layers readable.

    vmn · reviewed 2026-08-23