Resolved the problem of the error in ogrlistlayers(dsn = dsn) : cannot open data source.

Question

I get the error: error in ogrlistlayers(dsn = dsn) : cannot open data source when I try to run the program below:

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

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

The error appears the system notifies as follows:

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

I tried to solve it with another sample. I got the reference in the community forum, but it still returned an invalid result. If someone knows the solution, please give me the support. Thanks!

dttutoria · Accepted Answer

The cause: Because readOGR does not use path.expand, it does not function. As it is unsure if the first input is indeed a file path (It might represent a database).

Solution: To fix the error in ogrlistlayers(dsn = dsn) : cannot open data source, I recommend 3 ways to change your code:

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

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

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

Alice Berthet · Answer

The command returned an error Cannot open layer for me when I added the dsn or layer tags.

It worked when I added it all as readOGR('~/R/funwithR/data/ne_110m_land/ne_110m_land.shp').

Please note that my file was a GJSON, so I have only seen it with readOGR('~/R/funwithR/data/ne_110m_land/ne_110m_land.gjson')

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Resolved the problem of the error in ogrlistlayers(dsn = dsn) : cannot open data source.