Convert latitude/longitude to state plane coordinates

Question

I've got a dataset with latitude and longitude which I'd like to convert to the state plane coordinates for Illinois East, using EPSG 2790 (http://spatialreference.org/ref/epsg/2790/) or maybe ESRI 102672 (http://spatialreference.org/ref/esri/102672/).

This has definitely been asked before; my code is based on the answers here ("Non Finite Transformation Detected" in spTransform in rgdal R Package and http://r-sig-geo.2731867.n2.nabble.com/Converting-State-Plane-Coordinates-td5457204.html).

But for some reason I can't get it to work:

library(rgdal)
library(sp)
data = data.frame(long=c(41.20,40.05), lat=c(-86.14,-88.15))
coordinates(data) <- ~ long + lat
proj4string(data) <- CRS("+init=epsg:4326") # latitude/longitude
data.proj <- spTransform(data, CRS("+init=epsg:2790")) # illinois east

Gives:

non finite transformation detected:
  long    lat               
 41.20 -86.14    Inf    Inf 
Error in spTransform(data, CRS("+init=epsg:2790")) : failure in points 1
In addition: Warning message:
In spTransform(data, CRS("+init=epsg:2790")) :
  2 projected point(s) not finite

Answer 1

Here's some more working code that clarifies what's going on:

# convert a state-plane coordinate to lat/long
data = data.frame(x=400000,y=0)
coordinates(data) <- ~ x+y
proj4string(data) <- CRS("+init=epsg:2804")
latlong = data.frame(spTransform(data, CRS("+init=epsg:4326")))
setnames(latlong,c("long","lat"))
latlong

gives:

  long      lat
 1  -77 37.66667

and:

# convert a lat/long to state-plane
data = latlong
coordinates(data) <- ~ long+lat
proj4string(data) <- CRS("+init=epsg:4326")
xy = data.frame(spTransform(data, CRS("+init=epsg:2804")))
setnames(xy,c("y","x"))
xy

gives:

> xy
      y             x
1 4e+05 -2.690839e-08

And here's a function:

# this is for Maryland
lat_long_to_xy = function(lat,long) {
  library(rgdal)
  library(sp)
  data = data.frame(long=long, lat=lat)
  coordinates(data) <- ~ long+lat
  proj4string(data) <- CRS("+init=epsg:4326")
  xy = data.frame(spTransform(data, CRS("+init=epsg:2804")))
  setnames(xy,c("y","x"))
  return(xy[,c("x","y")])
}