RSurvey (version 0.6-0)

ProcessData: Process Data

Description

This function performs data processing on the state variables.

Usage

ProcessData()

Value

• Sets the data.pts and data.grd components of Data. The data.pts component is a data frame with variables:
• index
  integer; a vector of row numbers corresponding to rows in data.raw.
• x, y
  numeric; a vector of x and y coordinates.
• z
  numeric; a vector of state variable values (optional).
• t
  POSIXct; a vector of time stamps (optional).
• vx, vy
  numeric; a vector of velocity components in the x and y directions, respectively (optional).
• The data.grd component is a list with components:
• x, y
  numeric; a vector of grid line locations at which the values in z are measured.
• z
  matrix; interpolated surface of state variable with rows and columns corresponding to grid lines in the x and y directions, respectively.
• vx, vy
  matrix; interpolated surface of velocity components with rows and columns corresponding to grid lines in the x and y directions, respectively (optional).

Details

Input parameters for data processing are queried from Data and include: cols, vars, data.raw, data.pts, data.grd, lim.data, poly, poly.data, poly.crop, grid.dx, grid.dy, mba.m, mba.n, and mba.h (see Data). A data frame based on the user-defined state variables is first created. Records outside the user-defined spatial and temporal domains are then removed using: (1) data limits, where the x, y, z, and t limits are specified in the xlim, ylim, zlim, and tlim components of the lim.data list, respectively; and (2) a two-dimensional polygon defining the spatial domain within the xy-plane. An interpolated grid of z values in constructed using a Multilevel B-spline approximation. The spatial extent of the interpolated surface is constrained using polyLimit, a polygon that sets spatial limits for grided data; where z values corresponding to grid nodes located outside this polygon are set to NA.

See Also

mba.points

Examples

data(project)
ProcessData()