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UTM to latlong in R - with proj4

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I have received a shapefile with measurement points to be analyzed, but no matter how I try, I can't find how to convert to lat lon. I suppose it would be good to know the projection but when I look into the file (with R and summary()) it says "Is projected: NA" and "proj4string : [NA]".

One measurement-point I know is close to São Paulo - Brasil with has x,y latlong = -23.5489, -46.6388 - Zone 23.

How can I find out how to convert this point (and many others) to lat lon?

I tried to follow the instructions of similar questions here, but to no avail.

library(proj4)

proj4string <- "+proj=utm +zone=23 +south +ellps=WGS84 +datum=WGS84 +units=m +no_defs "

# Source data

xy <- data.frame(x="333132,00", y="7394597,00", options("digits"=12))

xy

# Transformed data

pj <- project(xy, proj4string, inverse=TRUE)

pj

latlon <- data.frame(lat=pj$y, lon=pj$x)

print(latlon)

proj utm

share|improve this question

asked 12 mins ago

Fagner SutelFagner Sutel

1

New contributor

Fagner Sutel is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  What libraries are you using in R? Also, this resource could be of use: nceas.ucsb.edu/~frazier/RSpatialGuides/…
  
  – smiller
  20 secs ago
  
  
  

  
  
  
  

add a comment | 

0

I have received a shapefile with measurement points to be analyzed, but no matter how I try, I can't find how to convert to lat lon. I suppose it would be good to know the projection but when I look into the file (with R and summary()) it says "Is projected: NA" and "proj4string : [NA]".

One measurement-point I know is close to São Paulo - Brasil with has x,y latlong = -23.5489, -46.6388 - Zone 23.

How can I find out how to convert this point (and many others) to lat lon?

I tried to follow the instructions of similar questions here, but to no avail.

library(proj4)

proj4string <- "+proj=utm +zone=23 +south +ellps=WGS84 +datum=WGS84 +units=m +no_defs "

# Source data

xy <- data.frame(x="333132,00", y="7394597,00", options("digits"=12))

xy

# Transformed data

pj <- project(xy, proj4string, inverse=TRUE)

pj

latlon <- data.frame(lat=pj$y, lon=pj$x)

print(latlon)

proj utm

share|improve this question

asked 12 mins ago

Fagner SutelFagner Sutel

1

New contributor

Fagner Sutel is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  What libraries are you using in R? Also, this resource could be of use: nceas.ucsb.edu/~frazier/RSpatialGuides/…
  
  – smiller
  20 secs ago
  
  
  

  
  
  
  

add a comment | 

I have received a shapefile with measurement points to be analyzed, but no matter how I try, I can't find how to convert to lat lon. I suppose it would be good to know the projection but when I look into the file (with R and summary()) it says "Is projected: NA" and "proj4string : [NA]".

One measurement-point I know is close to São Paulo - Brasil with has x,y latlong = -23.5489, -46.6388 - Zone 23.

How can I find out how to convert this point (and many others) to lat lon?

I tried to follow the instructions of similar questions here, but to no avail.

library(proj4)

proj4string <- "+proj=utm +zone=23 +south +ellps=WGS84 +datum=WGS84 +units=m +no_defs "

# Source data

xy <- data.frame(x="333132,00", y="7394597,00", options("digits"=12))

xy

# Transformed data

pj <- project(xy, proj4string, inverse=TRUE)

pj

latlon <- data.frame(lat=pj$y, lon=pj$x)

print(latlon)

proj utm

share|improve this question

asked 12 mins ago

Fagner SutelFagner Sutel

1

New contributor

Fagner Sutel is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

library(proj4)

proj4string <- "+proj=utm +zone=23 +south +ellps=WGS84 +datum=WGS84 +units=m +no_defs "

# Source data

xy <- data.frame(x="333132,00", y="7394597,00", options("digits"=12))

xy

# Transformed data

pj <- project(xy, proj4string, inverse=TRUE)

pj

latlon <- data.frame(lat=pj$y, lon=pj$x)

print(latlon)

share|improve this question

asked 12 mins ago

Fagner SutelFagner Sutel

1

New contributor

Fagner Sutel is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

asked 12 mins ago

Fagner SutelFagner Sutel

1

New contributor

Fagner Sutel is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 12 mins ago

Fagner SutelFagner Sutel

1

New contributor

Fagner Sutel is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 12 mins ago

Fagner SutelFagner Sutel

1