Convert DM coordinates values (sexagesimal) to DD (decimal degree)

Source: R/convert.r

This function is used to convert latitude and longitude from degrees, minutes format to decimal degree format, which is useful for map drawing.

conv_dm2dd(
  dm60,
  sep_marks = c(".", "-", "_", "u00b0"),
  out_original = FALSE,
  out_original_D = FALSE,
  out_original_M = FALSE
)

Arguments

dm60

sexagesimal numbers of character / numeric class.

sep_marks

a separation character between D and M part. Default: c(".", "-", "_", "u00b0")

out_original

include original values to output. Default: FALSE.

out_original_D

D (degrees) part on console to make sure the conversion is correct. Default: FALSE.

out_original_M

print M (minutes) part on console to make sure the conversion is correct. Default: FALSE.

Value

a vector of numeric class (default) or a data.frame if any output options are TRUE.

Details

See example

Examples

if(interactive()){
 numx <- c(34.30, 34.3, 34.03)
 conv_dm2dd(numx) # 34.50 34.50 34.05
 conv_dm2dd(numx, out_original_D = TRUE, out_original_M = TRUE)
 
 x <- c("35.30", "35.3", "35.03", "35", "30.30", "30.30.750")
 conv_dm2dd(x) # Make sure the last value equals (30 + 0.30750 / 60 * 100)
 
 x2 <- c("35°30′", "30°30.750′", NA, "35-30", "30-30.750", NA, "30_03")
 conv_dm2dd(x2)
 
 conv_dm2dd(x2, out_original = TRUE, out_original_D = TRUE, out_original_M = TRUE)
}
#>     value          org org_D  org_M
#> 1 35.5000     35°30′    35     30
#> 2 30.5125 30°30.750′    30 30.750
#> 3      NA         <NA>  <NA>   <NA>
#> 4 35.5000        35-30    35     30
#> 5 30.5125    30-30.750    30 30.750
#> 6      NA         <NA>  <NA>   <NA>
#> 7 30.0500        30_03    30     03