[R] conversion of d m s (lat) d m s (long) coordinates into decimal coordinates

Nicolas Degallier n|co|@@@deg@|||er @end|ng |rom |ree@|r
Tue Apr 26 15:03:28 CEST 2022

Hi Rui,

I succeded to convert a coordinate from decimal to DMS formats but not the inverse!!!

 dd<- -52.55684
c<-dd2dms(dd, NS = FALSE)
[1] 52d33'24.624"W

The use of char2dms() function is not so easy because I cannot yet read() the text file with the DMS coordinates (one col. with the points names, lat col. and long. col.)!!

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Here is the link to the archived versions of package measurements [1].
But the edit to that answer has another solution, with sp::char2dms and you are loading package sp.

[1] https://cran.hafro.is/src/contrib/Archive/measurements/

Hope this helps,

Rui Barradas

Às 10:57 de 25/04/2022, Nicolas Degallier escreveu:
> Hi Rui,
> Thanks for the information.
> Unfortunately, my versions of MacOS and of R are too old:
> > install.packages("measurements")
> Warning message:
> package ‘measurements’ is not available (for R version 3.2.1)
> > library(measurements)
> Warning message:
> le package ‘measurements’ a été compilé avec la version R 3.2.5
> There is no older package to do the same?
> Cheers
> Nicolas
> Le 25 avr. 2022 à 11:12, Rui Barradas a écrit :
>> Hello,
>> See if this StackOverflow.com <http://StackOverflow.com> post [1] solves your problem.
>> Also, examples should be minimal, you don't need all those packages to solve this problem.
>> [1] https://stackoverflow.com/a/69485865/8245406 <https://stackoverflow.com/a/69485865/8245406>
>> Hope this helps,
>> Rui Barradas
>> Às 21:43 de 24/04/2022, Nicolas Degallier escreveu:
>>> Dear R Users,
>>> I am using a 'simple' script to draw maps with points.
>>> It runs fine with the following libraries:
>>> library(sp)
>>> library(maptools)
>>> library(maps)
>>> library(mapdata)
>>> library(RColorBrewer)
>>> library(MASS)
>>> library(rgeos)
>>> library(GISTools)
>>> Until now, to prepare the input data, I have used manually some free net converter because the number of points to plot was not too high.
>>> Now I have much more points coordinates to convert from a GPS ° ' " (d m s) format to a decimal format which will be accepted by the R script to build maps.
>>> My initial data is of the form (tab delimited text file):
>>> nomlatlong
>>> "D. antoinei"6°04' S50°12'W
>>> "D. antoinei"3°45'S49°40'W
>>> "D. antoinei"3°1'49"N53°6'24"W
>>> "D. barberoi"13°03.3’S71°32.7’W
>>> "D. barberoi"10°59.3’S75°25.5’W"
>>> and I need them in the format (tab delimited):
>>> nomlatlong
>>> "D. antoinei"-11.944478527683975-71.28298997950684
>>> "D. antoinei"-12.833333-69.333333
>>> "D. antoinei"3.333333-60.283333
>>> "D. barberoi"-10.366667-67.683333
>>> "D. barberoi"-15.314500-55.970300
>>> Is there some 'simple' R script to do such a conversion?
>>> I am using R v. 3.2.1. on a iMac OS 10.6.8.
>>> May be this topic had already been resolved but I was unable to find the result in the FAQs.
>>> Cheers
>>> Nicolas Degallier
>>> <nicolas.degallier using free.fr <mailto:nicolas.degallier using free.fr>>
>>> <omalodes using yahoo.fr <mailto:omalodes using yahoo.fr>>
>>> Publications :
>>> https://www.documentation.ird.fr/listes/parauteur/DEGALLIER/NICOLAS/tout/annee <https://www.documentation.ird.fr/listes/parauteur/DEGALLIER/NICOLAS/tout/annee>
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