Meaning of column headers in file users_routes.csv
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Note: This file contains the linestrings participants drew to represent the route between the two randomly selected
POIs we asked them connect, representing a route they would take. 


participant_id 	::= the identifier of a participant 
origin			::= denotes the start of the route; this is a foreign key to the polygons_markers table (column: marker_id)
destination		::= denotes the destination of the route; this is a foreign key to the polygons_markers table (column: marker_id)
route_id		::= the unique identifier of a route
route_geometry 	::=	the representation of route as a linestring in hex EWKB (EPSG:4326)
updated_at		::= the timestamp when the route was finally submitted