calcSubType.Rd
Assign ship subtype according to the vessel's ship type and size, based on the requested methodology.
calcSubType( DWT, GT, TEU, nPassengers = NULL, shipType, method = "imo", inputTableLocation = NULL )
DWT | Deadweight tonnage (metric tons) (vector of numericals) |
---|---|
GT | Gross tonnage (metric tons) (vector of numericals) |
TEU | Twenty-foot equivalent units (TEUs) (vector of numericals) |
nPassengers | Maximum number of passengers (vector of numericals. Note: only applicable when using the Starcrest method) |
shipType | Ship type (vector of strings) (see |
method | Select the methodology that should be used (i.e., which set of subtypes to return):
Note: this argument is not used if |
inputTableLocation | File path (optional). Used to specify a user-supplied
set of subtypes. If used, this is typically the same as the auxiliary and
boiler load table so that correct loads are assigned. This table must follow
the format of |
subType
(vector of strings)
There are different sets of ship subtypes available for use: IMO's subtypes
or Starcrest's subtypes. Since ship subtypes are important for assigning
default auxiliary and boiler engine assumptions, the methodology selected
here should match with the methodology used for assigning auxiliary and
boiler loads. The IMO subtypes are based on the Third GHG Study, and the
Starcrest subtypes are based on the 2017 Port of Los Angeles air emissions
inventory. Alternatively, user-supplied subtypes could be used by specifying
a table of ship subtypes using the inputTableLocation
parameter.
For more information about ship subtype, see Section 3.3.3 of the Port Emissions Inventory Guidance.
When passing ship size data in the DWT
, GT
, TEU
, and
nPassengers
parameters, use NA
if the parameter is unknown or
not applicable (e.g., TEU doesn't apply for passenger vessels).
Note: IMO GHG 3 uses vehicle carrier subtypes which are based on number of vehicles. This information is frequently unavailable in vessel characteristics datasets. However, the auxiliary loads are assumed to be the same for all vehicle carriers regardless of size, so these number of vehicle subtypes are replaced by those used in the C3RIA.
Note: IMO GHG 3 uses cubic meters (m^3) for liquified gas tankers. This information is unavailable in vessel characteristics datasets, and it is unclear which ship parameter value was used to determine these values. Therefore, these vessel subtypes are defined by the same DWT bins as those used for chemical tankers.
International Maritime Organization. 2014. "Third IMO GHG study 2014 - Final report." London: International Maritime Organization.
calcSubType(DWT=c(NA,56188.016),GT=c(NA,33511),TEU=c(NA,NA),nPassengers=NULL,shipType=c("reefer","bulk.carrier"))#> subType #> 1: reefer #> 2: bulk.carrier.handymax