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NAME

v.maxent.swd - Export raster values at given point locations as text file in SWD format for input in Maxent

KEYWORDS

vector, export, Maxent

SYNOPSIS

v.maxent.swd
v.maxent.swd --help
v.maxent.swd [-eh] species=string[,string,...] [species_name=string] evp_maps=string[,string,...] [alias_names=string] [evp_cat=string[,string,...]] [alias_cat=string] [nbgp=number] [bgp=string] bgr_output=name species_output=name [nodata=number] [--overwrite] [--help] [--verbose] [--quiet] [--ui]

Flags:

-e
include the original columns in input layers in export to swd file
-h
skip header in csv
--overwrite
Allow output files to overwrite existing files
--help
Print usage summary
--verbose
Verbose module output
--quiet
Quiet module output
--ui
Force launching GUI dialog

Parameters:

species=string[,string,...] [required]
vector map(s) of species occurence
species_name=string
Alias-name(s) for species (default: map names).
evp_maps=string[,string,...] [required]
Environmental parameter map(s)
alias_names=string
Alias names for environmental parameter(s)
evp_cat=string[,string,...]
Categorial environmental parameter map(s)
alias_cat=string
Alias names for categorial parameter(s)
nbgp=number
Number or percentage of background points
Default: 10000
bgp=string
Vector layer with background / absence points
bgr_output=name [required]
Background SWD file
species_output=name [required]
Species SWD file
nodata=number
nodata value in output files
Default: -9999

Table of contents

DESCRIPTION

v.maxent.swd Produce a set of SWD files as input to MaxEnt 3.3.3k (version 3.4.1 untested, but should work as well), based on a point vector layer(s) of species distribution(s), a point layer with background points and user-defined raster layers. The user can also let the function create the background point file. (respecting region and mask, if set).

The SWD file format is a simple CSV-like file file format as described in Elith et al. 2011. The first three fields provide the species name, x-coordinate and y-coordinate, while subsequent fields contain the values of the user-selected environmental parameters. Note that the coordinates are not used by the MaxEnt program if all environmental data is given in the SWD format file.

The user can provide one or more species point files, which will be combined in one SWD file. The map names of both the species point layers and the environmental parameters can be replaced by alias names, which will be used by MaxEnt.

NOTES

The SWD output files are simple comma delimited text files (.csv) and can therefore be easily read in in for example R and subsequently used in other models / functions.

SEE ALSO

REFERENCES

AUTHOR

Paulo van Breugel, paulo at ecodiv.earth

Last changed: $Date: 2017-06-08 09:59:33 +0200 (Thu, 08 Jun 2017) $

SOURCE CODE

Available at: v.maxent.swd source code (history)


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