geoTrans | R Documentation |
geoTrans
transforms geographical coordinates in degrees,
minutes and seconds input as characters (or a factor) into numerical
values in degrees. geoTrans2
does the reverse operation.
geoTrans(x, degsym = NULL, minsym = "'", secsym = "\"")
geoTrans2(lon, lat = NULL, degsym = NULL, minsym = "'",
secsym = "\"", dropzero = FALSE, digits = 3,
latex = FALSE)
x |
a vector of character strings storing geographical coordinates; this can be a factor with the levels correctly set. |
degsym , minsym , secsym |
a single character giving the symbol used for degrees, minutes and seconds, respectively. |
lon |
either a vector of numeric values with the longitudes in
degrees, or, if |
lat |
a vector with the latitudes. |
dropzero |
a logical value: if |
digits |
an integer used for rounding the number of arc-seconds. |
latex |
a logical value: if |
geoTrans
should be robust to any pattern of spacing around the
values and the symbols (see examples). If the letter S, W, or O is
found is the coordinate, the returned value is negative. Note that
longitude and latitude should not be mixed in the same character
strings.
geoTrans2
can be used with cat
(see
examples).
The default for degsym
(NULL
) is because the degree
symbol (°) is coded differently in different character encodings.
By default, the function will use the appropriate character depending
on the system and encoding used.
geoTrans
returns a numeric vector with the coordinates in
degrees (eventually as decimal values). geoTrans2
returns a
character vector.
Emmanuel Paradis
geod
coord <- c("N 43°27'30\"", "N43°27'30\"", "43°27'30\"N",
"43° 27' 30\" N", "43 ° 27 ' 30 \" N",
"43°27'30\"", "43°27.5'")
cat(coord, sep = "\n")
geoTrans(coord)
geoTrans("43 D 27.5'", degsym = "D")
geoTrans("43° 27' 30\" S")
XL <- c(100.6417, 102.9500)
YL <- c(11.55833, 14.51667)
cat(geoTrans2(XL, YL, dropzero = TRUE), sep = "\n")
cat(geoTrans2(XL, YL, latex = TRUE), sep = "\\\n")
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.