[R] conversion of d m s (lat) d m s (long) coordinates into decimal coordinates
Rui Barradas
ru|pb@rr@d@@ @end|ng |rom @@po@pt
Wed Apr 27 13:07:44 CEST 2022
Hello,
Thanks for answering in Portuguese but R-Help is a English language
mailing list.
Here are two ways. Both results are equal.
# 1st
lat <- "21d15'44\"N"
lat1 <- sp::char2dms(lat, chd = "d", chm = "'", chs = "\"")
as.numeric(lat1)
#> [1] 21.26222
# 2nd
chd = substr(lat, 3, 3)[1]
chm = substr(lat, 6, 6)[1]
chs = substr(lat, 9, 9)[1]
lat2 <- sp::char2dms(lat, chd = chd, chm = chm, chs = chs)
as.numeric(lat2)
#> [1] 21.26222
Hope this helps,
Rui Barradas
Às 10:53 de 27/04/2022, Nicolas Degallier escreveu:
> Bom dia Rui (vejo que Vc. esta no Portugal),
>
> Avancei um pouco no tratamento dos meus dados de coordenadas geograficas.
> Portanto tenho uma mensagem de erro (o arquivo texto tem apenas uma
> linha de dados):
>
> coord <- read.table("coordDegal1.txt", header = TRUE)
> > coord
> nom lat long
> D. antoinei 21d15'44"N 55d12'30"W
>
> > lat<-coord[2]
> > lat
> lat
> 21d15'44"N
> > lat1<-char2dms(lat,chd="d", chm=" ' ", chs="\"")
>
> Error in if (any(abs(object using deg) > 360)) return("abs(degree) > 360")
> else if (any(object using WS & :
> valeur manquante là où TRUE / FALSE est requis
>
> Nao sei porque a função /char2dms/ não deu certo para transformar a
> coordenada 21d15'44"N em 21d15m44sN?
>
> Vc. teria uma explicação ?
> Atenciosamente
> Nicolas
>
>
> Le 26 avr. 2022 à 22:04, Rui Barradas a écrit :
>
>> Hello,
>>
>> You have a problem with the numbers format and with the smart single
>> close quotes. Try to substitute single quotes for the problem characters.
>>
>> Hope this helps,
>>
>> Rui Barradas
>>
>> Às 14:03 de 26/04/2022, Nicolas Degallier escreveu:
>>> 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)
>>> c
>>> [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.)!!
>>> Cheers
>>> Nicolas
>>> Hello,
>>> 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/
>>> <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>
>>>>> <http://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>
>>>>> <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>
>>>>>> <mailto:nicolas.degallier using free.fr <mailto:nicolas.degallier using free.fr>>>
>>>>>> <omalodes using yahoo.fr <mailto:omalodes using yahoo.fr>
>>>>>> <mailto: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>
>>>>>> <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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>
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