read_with_scheme.Rdread_with_scheme() is a wrapper for more specific functions. It uses
type and extension to call the good function. If those
parameters are not specified it tries to guess them from the name of the
archive included in x.
read_csv_with_scheme() relies on data.table::fread to read
tabular data, and to apply a scheme. The idea is to used the efficiency of
fread() to read more quickly data (and without too many specifications
on "sep" and "dec"), and to used some options to read only data that will be
kept with original format given in scheme. As almost, everyhting is done
after reading, the remaining part of applying a scheme is also one: final
format is applied, and if, some "lon" and "lat" is found, data is transformed
in sf object.
read_shp_with_scheme() relies on sf::st_read to read gpkg data.
If given, projection is changed. If given scheme is applyed through
apply_scheme(). It is supposed that the scheme given is organized with a
layer column.
read_gpkg_with_scheme() relies on sf::st_read to read gpkg data.
If given, projection is changed. If given scheme is applyed through
apply_scheme(). It is supposed that the scheme given is organized with a
layer column.
read_shp_from_7z uses a system call to 7z to uncompress a
7z archive. It looks specifically for files that correspond to given layer.
It then reads the uncompressed gpkg file with a call to
read_shp_with_scheme().
read_gkpg_from_7z uses a system call to 7z to uncompress a 7z archive.
It looks specifically for files with extension gkpg, and presumes that there
is only one. It then reads the uncompressed gpkg file with a call to
read_gpkg_with_scheme().
read_with_scheme(
x,
scheme = NULL,
projection = NA,
layer,
type,
extension = tools::file_ext(x)
)
read_csv_with_scheme(x, scheme = NULL, projection = NA)
read_shp_with_scheme(x, scheme = NULL, projection = NA, layer)
read_gpkg_with_scheme(x, scheme = NULL, projection = NA, layer)
read_shp_from_7z(x, scheme = NULL, projection = NA, layer)
read_gpkg_from_7z(x, scheme = NULL, projection = NA, layer)character, path of the data to be read.
data.frame, scheme to be applied.
something that will be used in the option "crs" of
sf::st_as_sf.
character, indicates the layer to be read for data organized by layers.
character, indicates the type of data that should be read.
character, indicate the exrtension of the archive. If missing will be guessed from x.
data adapted, either a data.frame or a 'sf' objects.
If 'scheme' is NULL (default). data.table::fread is used with
colClasses set to "character".
If 'projection' is NA (default), no crs is given sf::to st_as_sf.