Create a mask of valid locations

A logical vector is created with either TRUE or FALSE for each incoming longitude, latitude pair with TRUE indicating a valid location. This can be used to filter dataframes to retain only records with valid locations.

lonRange and latRange can be used to create a valid-mask for locations within a rectangular area.

removeZeroZero will invalidate the location 0.0, 0.0 which is sometimes seen in poorly QC'ed datasets.

NA values found in longitude or latitude will result in a mask value of FALSE.

createLocationMask(
  longitude = NULL,
  latitude = NULL,
  lonRange = c(-180, 180),
  latRange = c(-90, 90),
  removeZeroZero = TRUE
)

Arguments

longitude

Vector of longitudes in decimal degrees E.

latitude

Vector of latitudes in decimal degrees N.

lonRange

Range of valid longitudes.

latRange

Range of valid latitudes.

removeZeroZero

Logical indicating whether locations at 0.0, 0.0 should be marked as invalid.

Value

Vector of logical values.

Examples

library(MazamaCoreUtils)

createLocationMask(
  longitude = c(-120, NA, -120, -220, -120, 0),
  latitude = c(45, 45, NA, 45, 100, 0)
)
#> [1]  TRUE FALSE FALSE FALSE FALSE FALSE

createLocationMask(
  longitude = c(-120:-90),
  latitude = c(20:50),
  lonRange = c(-110, -100),
  latRange = c(30, 40)
)
#>  [1] FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE  TRUE
#> [13]  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE  TRUE FALSE FALSE FALSE FALSE
#> [25] FALSE FALSE FALSE FALSE FALSE FALSE FALSE