Dear List, I am attending to transform a set of points that are originally in latitude longitude (unprojected) to a Lambert Conformal Conic projection. I am a bit confused about the arguments to CRS and would appreciate any help.
I have an old file that contains point distances that were measured with the following projection information. This is from ArcMap which I no longer use. I need to use this old file to compare with my new distances. Projected Coordinate System: NAD_1983_StatePlane_North_Carolina_FIPS_3200 Projection: Lambert_Conformal_Conic False_Easting: 609601.22000000 False_Northing: 0.00000000 Central_Meridian: -79.00000000 Standard_Parallel_1: 34.33333333 Standard_Parallel_2: 36.16666667 Latitude_Of_Origin: 33.75000000 Linear Unit: Meter Geographic Coordinate System: GCS_North_American_1983 Datum: D_North_American_1983 Prime Meridian: Greenwich Angular Unit: Degree I would like the new point distance measurements that I am doing in SPATSTAT to be comparable to the old ones that used the projection above (in meters?). Here is what I have attempted... library(sp) library(rgdal) # dput(herb.sp) I hope this works I have never used dput() before! new("SpatialPoints" , coords = structure(c(-81.6809, -78.9455, -77.879, -83.1031, -78.6634, -79.057, 36.2147, 35.9982, 34.227, 35.2571, 35.7853, 35.9097), .Dim = c(6L, 2L), .Dimnames = list(NULL, c("coords.x1", "coords.x2"))) , bbox = structure(c(-83.1031, 34.227, -77.879, 36.2147), .Dim = c(2L, 2L), .Dimnames = list(NULL, c("min", "max"))) , proj4string = new("CRS" , projargs = " +proj=longlat +datum=WGS84 +ellps=WGS84 +towgs84=0,0,0" ) ) herb.lcc <- spTransform(herb.sp,CRS("+proj=lcc")) I am not sure that this contains all of the arguments needed. I tried looking at the PROG.4 manual here: ftp://ftp.remotesensing.org/proj/OF90-284.pdf , but I am still unclear how to proceed. Any help would be most appreciated! Thanks again, Michael -- Michael Denslow Graduate Student & Adjunct Instructor I.W. Carpenter Jr. Herbarium [BOON] Department of Biology Appalachian State University Boone, North Carolina U.S.A. -- AND -- Communications Manager Southeast Regional Network of Expertise and Collections sernec.org 36.214177, -81.681480 +/- 3103 meters _______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo