Data Processing and some output metrics scripts for working with the Exact Earth Exact AIS raw data dump for the Aleutian and Bering Sea Islands region off the Western Coast of Alaska.
Improved Voyage slicing and cleanup of voyage line transects.
Adds Directionality (0-360) and Cardinality ('N','NE','E','SE','S','SW','W','NW')
Adds some very simple methods, which appear to have decent results, for removing outliers in Voyages.
This method involves setting thresholds on the median absolute deviation.
These new tools are found in ais_shipping_voyage_splitter_phase3.py. Code is documented and is still in heavy development so it will be changing rapidly and unexpectedly.
Base_stati = Base station ID
COG = [AIS] Degrees (0-359); 511 = not available = default
Call_sign = [AIS] Ship radio call sign
Country = [AIS] Country of origin
Destinatio = [AIS] Port of destination
Heading = [AIS] Ship heading
IMO_ee = [AIS] vessel identification number
IMO_ihs = vessel identification number from IHS-join in PHASE II
MMSI = [AIS] Unique ship identification number
Message_ID = [AIS] AIS message number
Millisecon = [AIS] Timestamp milliseconds
PortofRegi = [AIS] Ship port of registry
ROT = [AIS]
Region = [AIS]
Repeat_ind = was the message repeated
SOG = [AIS] Knots (0-62); 63 = not available = default
ShipName = [AIS] Ship Name
Ship_Type = Vesel type
ShiptypeLe = Vessel type from IHS data in Phase II
Vessel_Nam = Vessel name from IHS data in Phase II
Voyage = [III] Unique Voyage name
lon_begin = [III] longitude value of the starting point of the transect
lon_end = [III] longitude value of the ending point of the transect
lat_begin = [III] latitude value of the starting point of the transect
lat_end = [III] latitude value of the ending point of the transect
time_begin = [III] time of stating point of the transect
time_end = [III] time of ending point of the transect
bear_begin = [III] bearing between the initial 2 points of the transect
bear_end = [III] bearing between the ending 2 points of the transect
dir4_begin = [III] this is the old 'simple_direction' with a 4-quadrant return of directionality between the first 2 points of the voyage
dir4_end = [III] this is the old 'simple_direction' with a 4-quadrant return of directionality between the last 2 points of the voyage
dir8_begin = [III] a new 8 direction version of the simple direction between the first 2 points of the voyage.
dir8_end = [III] a new 8 direction version of the simple direction between the last 2 points of the voyage.
METADATA Describing all of the data in a global way following ISO-19119 using GeoNetwork.