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Correct the GPS coordinates

Source: R/correctCoordGPS.R
correctCoordGPS.Rd

This function builds the most probable GPS coordinates of the plot corners from multiple GPS measurements.

Usage

correctCoordGPS(
  longlat = NULL,
  projCoord = NULL,
  coordRel,
  rangeX,
  rangeY,
  maxDist = 15,
  drawPlot = FALSE,
  rmOutliers = TRUE
)

Arguments

longlat

(optional) data frame with the coordinate in longitude latitude (eg. cbind(longitude, latitude)).

projCoord

(optional) data frame with the projected coordinate in X Y

coordRel

data frame with the relative coordinate in the same order than the longlat or projCoord

rangeX

a vector of length 2 giving the range for plot relative X coordinates

rangeY

a vector of length 2 giving the range for plot relative Y coordinates

maxDist

a numeric giving the maximum distance above which GPS measurements should be considered as outliers (by default 15 m)

drawPlot

a logical if you want to display a graphical representation

rmOutliers

a logical if you want to remove the outliers from coordinates calculation

Value

If there are no outliers or rmOutliers = TRUE, a list with:

  • cornerCoords: a data.frame with the coordinates of the corners

  • correctedCoord: a data.frame with the adjusted coordinates given as input

  • polygon: a spatial polygon

  • outliers: index of coordinates lines considered as outliers, if any

  • codeUTM: the UTM code of the coordinates if the parameter longlat is set

Details

GPS coordinates should be either given in longitude latitude (longlat) or in projected coordinates (projCoord)

Author

Arthur PERE, Maxime REJOU-MECHAIN

Examples

projCoord <- data.frame(
  X = c(
    runif(5, min = 9, max = 11), runif(5, min = 8, max = 12),
    runif(5, min = 80, max = 120), runif(5, min = 90, max = 110)
  ),
  Y = c(
    runif(5, min = 9, max = 11), runif(5, min = 80, max = 120),
    runif(5, min = 8, max = 12), runif(5, min = 90, max = 110)
  )
)
projCoord <- projCoord + 1000
coordRel <- data.frame(
  X = c(rep(0, 10), rep(100, 10)),
  Y = c(rep(c(rep(0, 5), rep(100, 5)), 2))
)

aa <- correctCoordGPS(
  projCoord = projCoord, coordRel = coordRel,
  rangeX = c(0, 100), rangeY = c(0, 100)
)
#> Warning: This function still work but will be removed (defunct) and replaced by checkCoordPlot in the next version. Please see VIGNETTENAME? vignette
#> Warning: 'correctCoordGPS()' has been replaced by `check_plot_coord()` function and will be removed in the next version.
#> Please see the vignette `Spatialized trees and forest stand metrics with BIOMASS`
bb <- correctCoordGPS(
  projCoord = projCoord, coordRel = coordRel,
  rangeX = c(0, 100), rangeY = c(0, 100), rmOutliers = TRUE
)
#> Warning: This function still work but will be removed (defunct) and replaced by checkCoordPlot in the next version. Please see VIGNETTENAME? vignette
#> Warning: 'correctCoordGPS()' has been replaced by `check_plot_coord()` function and will be removed in the next version.
#> Please see the vignette `Spatialized trees and forest stand metrics with BIOMASS`
#> Warning: calling par(new=TRUE) with no plot
# \donttest{
correctCoordGPS(
  projCoord = projCoord, coordRel = coordRel,
  rangeX = c(0, 100), rangeY = c(0, 100), drawPlot = TRUE
)
#> Warning: This function still work but will be removed (defunct) and replaced by checkCoordPlot in the next version. Please see VIGNETTENAME? vignette
#> Warning: 'correctCoordGPS()' has been replaced by `check_plot_coord()` function and will be removed in the next version.
#> Please see the vignette `Spatialized trees and forest stand metrics with BIOMASS`
#> $cornerCoords
#>          X        Y
#> 1 1005.457 1006.966
#> 2 1105.414 1004.032
#> 3 1108.348 1103.989
#> 4 1008.391 1106.923
#> 
#> $correctedCoord
#>           X        Y
#> 1  1005.457 1006.966
#> 2  1005.457 1006.966
#> 3  1005.457 1006.966
#> 4  1005.457 1006.966
#> 5  1005.457 1006.966
#> 6  1008.391 1106.923
#> 7  1008.391 1106.923
#> 8  1008.391 1106.923
#> 9  1008.391 1106.923
#> 10 1008.391 1106.923
#> 11 1105.414 1004.032
#> 12 1105.414 1004.032
#> 13 1105.414 1004.032
#> 14 1105.414 1004.032
#> 15 1105.414 1004.032
#> 16 1108.348 1103.989
#> 17 1108.348 1103.989
#> 18 1108.348 1103.989
#> 19 1108.348 1103.989
#> 20 1108.348 1103.989
#> 
#> $polygon
#> Geometry set for 1 feature 
#> Geometry type: POLYGON
#> Dimension:     XY
#> Bounding box:  xmin: 1005.457 ymin: 1004.032 xmax: 1108.348 ymax: 1106.923
#> CRS:           NA
#> POLYGON ((1005.457 1006.966, 1105.414 1004.032,...
#> 
#> $outliers
#> [1] 11 14 17
#> 
# }