Atlas Handbook
Data fields
What each field means and which values it accepts - for reading the map closely and for reusing the data honestly.
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Antarctic data fields
What the Antarctic layers commit to when they call something conjectured, reported, observed or drawn by us.
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Crusades data fields
What the Crusades layers commit to when they say a stage, a route, a claim, a possession or a centre.
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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.
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Hanseatic data fields
Participation classes, evidence types and certainty - the vocabulary that lets the Hanseatic layers show how well attested each thing is.
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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.