survey_substitute: Substitute Survey
In mkoohafkan/RAStestR: Functions for testing RAS outputs

Substitute a portion of a cross section.

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survey_substitute(d, substitute.stations, mode = c("lag", "lead"),
  station.col = "Station", time.col = "Time", distance.col = "Distance",
  elevation.col = "Elevation")

`d`	The survey data in cross section format.
`substitute.stations`	The stations to substitute
`mode`	Extend cross sections by using data from prior cross section (lag) or future cross section (lead).
`station.col`	The column containing cross section station IDs.
`time.col`	The column containing time stamps.
`distance.col`	The column containing cross section distances.
`elevation.col`	The column containing cross section elevations.