transform_xy()
transforms geospatial x/y coordinates to a new projection.
Arguments
- pts
A two-column data frame or numeric matrix containing geospatial x/y coordinates.
- srs_from
Character string in OGC WKT format specifying the spatial reference system for
pts
.- srs_to
Character string in OGC WKT format specifying the output spatial reference system.
Examples
pt_file <- system.file("extdata/storml_pts.csv", package="gdalraster")
pts <- read.csv(pt_file)
print(pts)
#> id xcoord ycoord
#> 1 1 324650.9 5103344
#> 2 2 324171.0 5103034
#> 3 3 323533.4 5103329
#> 4 4 325220.0 5103508
#> 5 5 325703.1 5102377
#> 6 6 326297.8 5103924
#> 7 7 325520.4 5104146
#> 8 8 326247.7 5102506
#> 9 9 327711.7 5104476
#> 10 10 324181.7 5103901
## id, x, y in NAD83 / UTM zone 12N
## transform to NAD83 / CONUS Albers
transform_xy(pts = pts[,-1],
srs_from = epsg_to_wkt(26912),
srs_to = epsg_to_wkt(5070))
#> [,1] [,2]
#> [1,] -1330885 2684892
#> [2,] -1331408 2684660
#> [3,] -1331994 2685048
#> [4,] -1330297 2684967
#> [5,] -1329991 2683777
#> [6,] -1329167 2685212
#> [7,] -1329903 2685550
#> [8,] -1329432 2683821
#> [9,] -1327683 2685541
#> [10,] -1331265 2685514