tv2vegtable {vegtable}

Import of vegetation data from Turboveg databases

Description

Import function for Turboveg databases into an object of class vegtable. Most of the contents of Turboveg databases are included in DBF files and therefore imported by the function foreign::read.dbf(). The automatic setting of database path will be done by the function vegdata::tv.home() but it can be customised by the argument tv_home.

The species list will be imported by using the function taxlist::tv2taxlist() and therefore formatted as a taxlist object. Similarly, conversion tables will be handled as coverconvert objects.

Empty columns in the header will be deleted in the imported object.

The function tv2coverconvert() reads the content of cover conversion tables stored in Turboveg and attempts to reformat them in a more comprehensive structure.

This function is used by tv2vegtable() to import the respective conversion table from Turboveg databases. Note that conversion tables in Turboveg have only stored the middle point for each cover class in a scale, thus it will be recommended to rebuild the coverconvert slot or use braun_blanquet.

Usage

tv2vegtable(
  db,
  tv_home = tv.home(),
  skip_empty_relations = TRUE,
  skip_scale,
  clean = TRUE
)

tv2coverconvert(file, as.is = TRUE)

Arguments

db

Name of Turboveg data base as character value.

tv_home

Turboveg installation path as character value.

skip_empty_relations

Logical value indicating whether empty relations may be excluded from imported database or not.

skip_scale

Character value indicating scales to be excluded in slot coverconvert.

clean

Logical value indicating whether output object should be cleaned or not.

file

A connection to a DBF file containing conversion table in Turboveg.

as.is

A logical value passed to read.dbf().

Value

A vegtable object in the case of tv2vegtable(). A coverconvert object in the case of tv2coverconvert().

Author(s)

Miguel Alvarez [e-mail]

See Also

taxlist::tv2taxlist() foreign::read.dbf() vegdata::tv.home()

Examples

## Installed 'Turboveg' version of 'Fujiwara et al. (2014)'
# TV_Home <- file.path(path.package("vegtable"), "tv_data")
# Veg <- tv2vegtable("Fujiwara_2014", TV_Home)
# summary(Veg)
## Installed 'Turboveg' version of "Fujiwara et al. (2014)"
TV_Home <- file.path(path.package("vegtable"), "tv_data", "popup", "Swea")
Table <- tv2coverconvert(file.path(TV_Home, "tvscale.dbf"))

## First scale have to be deleted from conversion table
Table@value <- Table@value[-1]
Table@conversion <- Table@conversion[-1]
summary(Table)

## Compare the 'Turboveg' version with a vegtable version
data(braun_blanquet)
summary(Table$br_bl)
summary(braun_blanquet$br_bl)