| EventData {PBSmapping} | R Documentation |
PBS Mapping functions that expect EventData will accept properly formatted data frames in their place (see 'Details').
as.EventData attempts to coerce a data frame to an object with
class EventData.
is.EventData returns TRUE if its argument is of class
EventData.
as.EventData(x, projection = NULL, zone = NULL) is.EventData(x, fullValidation = TRUE)
x |
data frame to be coerced or tested. |
projection |
optional projection attribute to add to
EventData, possibly overwriting an existing attribute. |
zone |
optional zone attribute to add to EventData,
possibly overwriting an existing attribute. |
fullValidation |
Boolean value; if TRUE, fully test
x. |
We define EventData as a data frame with at least three fields named
(EID, X, Y). Conceptually, an EventData object describes events that
take place at specific points (X, Y) in two-dimensional
space. Additional fields specify measurements associated with these
events. For example, in a fishery context EventData could describe
fishing events associated with trawl tows, based on the fields:
EID - fishing event (tow) identification number;
X, Y - fishing location;
Duration - length of time for the tow;
Depth - average depth of the tow;
Catch - biomass captured.
Like PolyData, EventData can have attributes projection
and zone, which may be absent. Inserting the string
"EventData" as the class attribute's first element alters the
behaviour of some functions, including print (if
PBSprint is TRUE) and summary.
The as.EventData method returns an object with classes
"EventData" and "data.frame", in that order.
LocationSet, PolyData, PolySet.