sf (version 0.1-1)

ST_read: read simple features from file or database

Description

read simple features from file or database

read PostGIS table directly through DBI and RPostgreSQL interface, converting wkb

Usage

st_read(dsn, layer, ...)
st_write(sf, dsn = ".", layer, driver = "ESRI Shapefile", opts = character(), ...)
st_read_pg(cn = NULL, query, dbname, geom_column = NULL, ...)

Arguments

dsn

data source name (interpretation varies by driver - for some drivers, dsn is a file name, but may also be a folder)

layer

layer name (varies by driver, may be a file name without extension)

...

parameter(s) passed on to st_as_sf

sf

object of class sf

driver

driver name

opts

options to pass on to driver

cn

open database connection

query

SQL query to select records

dbname

character; database name, only used if cn is NULL

geom_column

character or integer: indicator of name or position of the geometry column; if not provided, the last column of type character is chosen

Examples

if (Sys.getenv("USER") == "edzer") {
 (s = st_read("PG:dbname=test", "test"))
 summary(s)
}
(s = st_read(system.file("shapes/", package="maptools"), "sids"))[1:10,]
summary(s)
if (Sys.getenv("USER") == "edzer") {
  st_read_pg(dbname = "postgis", query = "select * from meuse2 limit 3;")
}