[R-sig-Geo] testing a crs string

[Roy Mendelssohn - NOAA Federal]

perfect.  Thank you.   I thought there must be a function in one of the packages to check.

-Roy

> On Jun 20, 2019, at 7:42 AM, Edzer Pebesma <edzer.pebesma using uni-muenster.de> wrote:
> 
> 
> 
> On 6/20/19 4:18 PM, Roy Mendelssohn - NOAA Federal via R-sig-Geo wrote:
>> Hi All:
>> 
>> I am extending a package I have to allow users to provide a crs string, which will eventually through some other packages be sent to sf.  I like to try and make at least minimal tests that inputs are valid.  Is there some existing code that will check if a string is a valid crs string?
> 
>> inherits(try(sf::st_crs("+proj=invalid"), silent = TRUE), "try-error")
> [1] TRUE
>> inherits(try(sf::st_crs("+proj=longlat"), silent = TRUE), "try-error")
> [1] FALSE
> 
> 
>> 
>> Thanks,
>> 
>> -Roy
>> 
>> 
>> **********************
>> "The contents of this message do not reflect any position of the U.S. Government or NOAA."
>> **********************
>> Roy Mendelssohn
>> Supervisory Operations Research Analyst
>> NOAA/NMFS
>> Environmental Research Division
>> Southwest Fisheries Science Center
>> ***Note new street address***
>> 110 McAllister Way
>> Santa Cruz, CA 95060
>> Phone: (831)-420-3666
>> Fax: (831) 420-3980
>> e-mail: Roy.Mendelssohn using noaa.gov www: http://www.pfeg.noaa.gov/
>> 
>> "Old age and treachery will overcome youth and skill."
>> "From those who have been given much, much will be expected" 
>> "the arc of the moral universe is long, but it bends toward justice" -MLK Jr.
>> 
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>> 
> 
> -- 
> Edzer Pebesma
> Institute for Geoinformatics
> Heisenbergstrasse 2, 48151 Muenster, Germany
> Phone: +49 251 8333081
> <pEpkey.asc>_______________________________________________
> R-sig-Geo mailing list
> R-sig-Geo using r-project.org
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**********************
"The contents of this message do not reflect any position of the U.S. Government or NOAA."
**********************
Roy Mendelssohn
Supervisory Operations Research Analyst
NOAA/NMFS
Environmental Research Division
Southwest Fisheries Science Center
***Note new street address***
110 McAllister Way
Santa Cruz, CA 95060
Phone: (831)-420-3666
Fax: (831) 420-3980
e-mail: Roy.Mendelssohn using noaa.gov www: http://www.pfeg.noaa.gov/

"Old age and treachery will overcome youth and skill."
"From those who have been given much, much will be expected" 
"the arc of the moral universe is long, but it bends toward justice" -MLK Jr.