Pleiades Plus ============= Pleiades Plus is an experimental machine alignment between Pleiades place resources and content in the Geonames Gazetteer. Conceived and prototyped by Leif Isaksen (University of Southampton/Pelagios Project), the current version is produced daily by Ryan Baumann (Duke Collaboratory for Classics Computing). Code and data are available from https://github.com/ryanfb/pleiades-plus. The CSV file produced by the code is also distributed via http://pleiades.stoa.org/downloads/. Short explanation of algorithm ------------------------------ The algorithm for determining matches iterates through an array of names associated with Pleiades places, checking for exact string matches against names and alternate names in GeoNames. A given name match is included in the output if it meets one of the following criteria: * if the Pleiades place resource is a point, and the GeoNames resource is within a distance threshold * if the Pleiades place resource is a bounding box, and the GeoNames resource is inside that bounding box * if the Pleiades place resource is a bounding box, and the GeoNames resource is not inside that bounding box but is within a distance threshold of its representative point (centroid of associated locations in Pleiades) * if the Pleiades place resource is unlocated, and the GeoNames resource is contained by the bounding box of the Barrington Atlas capgrid associated with that place (http://atlantides.org/capgrids/) Columns in the CSV ------------------ pleiades_url: HTTP URI (string) URI for the Pleiades place resource that the code thinks corresponds to the GeoNames resource identified in "geonames_url" geonames_url: HTTP URI (string) URL for the Geonames place record that the code thinks corresponds to the Pleiades place resource identified in "pleiades_url" match_type: string "distance": Haversine distance between the Pleiades point or bounding box and the Geonames point was less than 8.0km. "bbox": Geonames coordinates are contained by the Pleiades bounding box "capgrid": Geonames coordinates within the bounding box of the Barrington Atlas grid square for an unlocated Pleiades place distance: float Haversine distance in kilometers between the Geonames coordinates and the Pleiades coordinates or bounding box. If match_type="contains" this value will be 0. pleiades_locationPrecision: string Values copied from the Pleiades location precision field for this place resource: "precise" or "rough". pleiades_featureTypes: string of comma-delimited strings Values copied from the Pelaides feature type field for the place. Values drawn from the Pleiades "Feature (or Place) Categories" vocabulary: http://pleiades.stoa.org/vocabularies/place-types geonames_featurecode: string Value copied from the Geonames feature code. Values drawn from the Geonames Features Codes vocabulary: http://www.geonames.org/export/codes.html