Feature Catalog for Offshore Platforms in the Gulf of Mexico, 2011 Drilling Platforms 2008 eng; US Hart Energy Publishing OFFSH_PLATF Offshore Lease Blocks false FID Internal feature number. ESRI ESRI OID Shape Feature geometry. ESRI ESRI Geometry AREA Feature's area Double PERIMETER Double PLATFORM_ Integer PLATFORM_I Integer COMPLEX_ID is the unique identifier assigned to a single man-made structure or a group of structures connected by a walkway. Integer STR_NUMBER is a unique number assigned to a specific structure within a complex. SmallInteger STR_NAME is the name of the structure assigned by the owner. String INSTALL_DA is the platform installation date stored in Arc/Info DATE data field. Date REMOVAL_DA is the platform removal date in Arc/Info DATE data field. Date INSTALL is the platform installation date in Arc/Info character data field String REMOVAL is the platform removal date in Arc/Info character data field. String POLYGONID Integer SCALE Double ANGLE Double