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Save hrbrmstr/7ba57441dffac9a9126b to your computer and use it in GitHub Desktop.
| library(rgdal) | |
| library(rgeos) | |
| library(maptools) | |
| library(mapproj) | |
| us <- readOGR("http://bl.ocks.org/mbostock/raw/4090846/us.json", "states") | |
| proj4string(us) <- CRS("+proj=merc") | |
| map <- fortify(us) | |
| gg <- ggplot() | |
| gg <- gg + geom_map(data=map, map=map, | |
| aes(x=long, y=lat, map_id=id, group=group), | |
| fill="#ffffff", color="#0e0e0e", size=0.15) | |
| gg <- gg + xlim(-124.848974, -66.885444) | |
| gg <- gg + ylim(24.396308, 49.384358) | |
| gg <- gg + coord_map(projection="albers", lat=39, lat1=45) | |
| gg <- gg + labs(x=NULL, y=NULL, title=NULL) | |
| gg <- gg + theme(legend.position="bottom") | |
| gg <- gg + theme(legend.key=element_blank()) | |
| gg <- gg + theme(plot.title=element_text(size=16)) | |
| gg |
Still getting the "Error in ogrInfo(dsn = dsn, layer = layer, encoding = encoding, use_iconv = use_iconv, :
Cannot open file" -- I will try reinstalling the package
DOH! Memory: triggered. You need the absolute latest gdal library installed and then re-install rgdal.
Still no luck :(
library(rgdal)
Loading required package: sp
rgdal: version: 0.9-1, (SVN revision 518)
Geospatial Data Abstraction Library extensions to R successfully loaded
Loaded GDAL runtime: GDAL 1.9.2, released 2012/10/08
Path to GDAL shared files: /Users/alexbresler/Library/R/3.1/library/rgdal/gdal
Loaded PROJ.4 runtime: Rel. 4.8.0, 6 March 2012, [PJ_VERSION: 480]
Path to PROJ.4 shared files: /Users/alexbresler/Library/R/3.1/library/rgdal/proj
library(rgeos)
rgeos version: 0.3-8, (SVN revision 460)
GEOS runtime version: 3.3.3-CAPI-1.7.4
Polygon checking: TRUElibrary(maptools)
Checking rgeos availability: TRUE
library(mapproj)
Loading required package: maps
us <- readOGR("http://bl.ocks.org/mbostock/raw/4090846/us.json", "states")
Error in ogrInfo(dsn = dsn, layer = layer, encoding = encoding, use_iconv = use_iconv, :
Cannot open file
Did you ever get this figured out? I'm getting the same error.
Most of the TopoJSON files I've seen with D3 maps seem to have no projection associated with them. This reads it in from the URL (I picked the "states" feature simply since it's faster to work with :-), assigns a projection to it then does the ggplot stuff. It's rly important to use the proper bounding box (try removing the xlim/ylim and see what happens :-) since Albers really does do a transform on the projection. I left the background and gridlines in just so so you can see what it does to the projection.