我不确定为什么,但是我根本无法在r中读取shapefile!
在MacOS Mojave上,
我尝试过:
afg <- readOGR("afg.shp")
afg <- readOGR(dsn = ".", layer = "afg")
shapefile来自以下网站:http://www.diva-gis.org/gdata,阿富汗公路。
此错误不断发生:
Error in ogrInfo(dsn = dsn, layer = layer, encoding = encoding, use_iconv = use_iconv, :
Cannot open layer
但是,此代码有效:
countries <- readOGR("countries.geojson")
有人能弄清楚为什么吗?
答案 0 :(得分:2)
我在Mojave上,效果很好:
httr::GET(
url = "http://biogeo.ucdavis.edu/data/diva/rds/AFG_rds.zip",
httr::write_disk("AFG_rds.zip"),
httr::progress()
) -> res
fils <- unzip("AFG_rds.zip", exdir = "afg-roads")
fils
## [1] "afg-roads/AFG_roads.dbf" "afg-roads/AFG_roads.prj"
## [3] "afg-roads/AFG_roads.shp" "afg-roads/AFG_roads.shx"
rgdal::readOGR("afg-roads/AFG_roads.shp")
## OGR data source with driver: ESRI Shapefile
## Source: "/Users/bob/Development/afg-roads/AFG_roads.shp", layer: "AFG_roads"
## with 1409 features
## It has 5 fields
## class : SpatialLinesDataFrame
## features : 1409
## extent : 60.6075, 74.67168, 29.38582, 38.48983 (xmin, xmax, ymin, ymax)
## coord. ref. : +proj=longlat +datum=WGS84 +no_defs +ellps=WGS84 +towgs84=0,0,0
## variables : 5
## names : MED_DESCRI, RTT_DESCRI, F_CODE_DES, ISO, ISOCOUNTRY
## min values : Unknown, Primary Route, Road, AFG, AFGHANISTAN
## max values : Without Median, Unknown, Trail, AFG, AFGHANISTAN
答案 1 :(得分:0)
我也面临着同样的问题。不要尝试重命名文件。解压缩后,您将获得许多文件,其中一个将是shapefile。就我而言,所有这些文件都具有相同的名称,但扩展名不同。然后做你已经在做的事情:
afg <- readOGR(dsn = ".", layer = "AFG_roads")
希望这会起作用。