readOGR() cannot open file

问题:

wmap <- readOGR(dsn="~/R/funwithR/data/ne_110m_land", layer="ne_110m_land")

This code is not loading the shape file and error is generated as

Error in ogrInfo(dsn = dsn, layer = layer, encoding = encoding, use_iconv = use_iconv,  : 
Cannot open file

I am sure that the directory is correct one. At the end / is also not there and layer name is also correct.

Inside the ne_110m_land directory files I have are:

ne_110m_land.dbf
ne_110m_land.prj
ne_110m_land.shp
ne_110m_land.shx
ne_110m_land.VERSION.txt
ne_110m_land.README.html

回答1:

You could have shown that you have the right path with:

list.files('~/R/funwithR/data/ne_110m_land', pattern='\\.shp$')
file.exists('~/R/funwithR/data/ne_110m_land/ne_110m_land.shp')

perhaps try:

readOGR(dsn=path.expand("~/R/funwithR/data/ne_110m_land"), layer="ne_110m_land")

or a simpler alternative that is wrapped around that:

library(raster)
s <- shapefile("~/R/funwithR/data/ne_110m_land/ne_110m_land.shp")

回答2:

For me, the command returned the Cannot open layer error when I included the dsn and layer tags.

So when I included it all just as readOGR('~/R/funwithR/data/ne_110m_land/ne_110m_land.shp') it worked.

Note that my file was a gjson, so I've only seen this with readOGR('~/R/funwithR/data/ne_110m_land/ne_110m_land.gjson')