Introduction

A primary technical impediment to large-scale sharing of vegetation data is the lack of a recognized international exchange standard for linking the panoply of tools and database implementations that exist among various organizations and individuals participating in vegetation research.

The Veg-X exchange standard

The Veg-X exchange standard for plot-based vegetation data (Wiser et al. 2011) is intended to be used to share and merge vegetation-plot data of different kinds. Veg-X allows for observations of vegetation at both individual plant and aggregated observation levels. It ensures that observations are fixed to physical sample plots at specific points in space and time, and makes a distinction between the entity of interest (e.g. an individual tree) and the observational act (i.e. a measurement). The standard supports repeated measurements of both individual organisms and plots, and enables the connection between the entity observed and the taxonomic concept associated with that observation to be maintained.

Detailed documentation of Veg-X

Please read article The Veg-X exchange standard to know mode about the standard.

XML schema

Veg-X is written as an XML schema, which is a definition of user-defined tags to structure textual information in order to create self-describing datasets. XML (Extensible Markup Language) is an open standard, and XML files are both machine and human-readable (they are stored in plain-text ASCII format). Visit folder vegxschema to see the XML schema representation of the standard. This schema should be used to evaluate whether a given Veg-X XML document conforms to the definitions and data structure of the standard.

An R package to use the Veg-X standard

A barrier to the use of a standard like Veg-X is its complexity. To make the exchange schema of Veg-X usable by the wider community requires the development of informatics tools for mapping data from different input formats (e.g. relevé tables from different databases, forest inventory data or stem-mapped forest plots) into Veg-X, mechanisms to create unique identifiers to allow source datasets to be combined, and tools to export data for data analysis and visualisation. The VegX R package has been designed for this purpose. It contains functions to import, integrate, harmonize and export vegetation data using the Veg-X standard.

Package installation

The VegX R package can be installed from GitHub as follows:

devtools::install_github("miquelcaceres/VegX", build_vignettes=TRUE)

User manual

Please refer to How to use the VegX package to learn how to use the VegX package.

Acknowledgements

Developments endorsed and funded by the International Association for Vegetation Science

Veg-X standard development:

  • Miquel De Cáceres
  • Sebastian Schmidtlein
  • Susan K. Wiser
  • Nick Spencer
  • Robert K. Peet
  • Martin Kleikamp
  • Brad Boyle

VegX R package development:

  • Miquel De Cáceres

References