extractPolygonsTrack: Extracts corresponding raster values for GPS tracks.

In henningte/herdersTA: Extracting Movement Characteristics from GPS Trajectories of Nomadic Households

Description

extractPolygonsTrack is a function in order to extract values from SpatialPolygonsDataFrame objects for an object of class Track.

Usage

extractPolygonsTrack(
  x,
  y,
  fn = NULL,
  ...,
  fixedlocationcoords = TRUE,
  what = NULL
)

Arguments

x	A SpatialPolygonsDataFrame object.
y	A Track object. Depending on other parameters set, there may be certain variables required.
fn	function to summarize the values (e.g. mean).
...	further arguments passed to over.
fixedlocationcoords	A logical value indicating if for each location in y the same position is assumed for all data values. In this case, computation can be speed up by setting location = TRUE and the function uses simply the coordinates of the first value for each location.
what	A numeric vector specifying the column(s) of x from which to retain values. If set to NULL, values for all columns will be extracted.

Value

A data.frame with a value for each data value of y in columns specified with what. If a value of x cannot be assigned to a respective data value, NA is returned for the respective data value.

See Also

extractRasterTrack, extractPolygonsTracks.

Examples

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henningte/herdersTA documentation built on Jan. 22, 2020, 5:16 a.m.