# GeoRarefaction_MultiTaxa: Calculates six geographic range measures at resampled a... In GeoRange: Calculating Geographic Range from Occurrence Data

## Description

Calculates six geographic range measures at resampled a number of time from specified sample sizes

## Usage

 ```1 2 3 4``` ```GeoRarefaction_MultiTaxa(nLocCut = 3, OccMatrix, TaxaStart, LongPos = 1, LatPos = 2, iter = 10, CellSize = 5, longBounds = c(-180, 180), latBounds = c(-90, 90), steps = c(1, 50, 40, 30, 20, 10, 5), replacePts = FALSE) ```

## Arguments

 `nLocCut` - The minimum number of locations a taxon must be seen at to have geographic range measures calculated `OccMatrix` - A matrix where columns are taxon occurrences and also having at least longitude and latitude values `TaxaStart` - The column index value where taxon records start `LongPos` - The column index value of longitudinal coordinates in the OccMatrix `LatPos` - The column index value of latitudinal coordinates in the OccMatrix `iter` - The number of times a taxon's locations are resampled at each step size `CellSize` - The size of each cell in degree X degree `longBounds` - Array of longitudinal boundaries in decimal degrees `latBounds` - Array of latitudinal boundaries in decimal degrees `steps` - Array of the values representing the number of points to be subsampled for each taxon `replacePts` - A logical value indicating whether points are allowed to be sampled more than once during each subsampling iteration

## Details

The nLocCut parameter is the minimum number of distinct geographic locations a taxon must be observed at to have geographic range measures calcualted, if below retruns NA. The steps parameter typically begins with a 1 representing that all points should be used in calculations but this is not required. The replacePts parameter must be set to TRUE if any of the steps require a greater number of points to be sampled than there are actual locations for a taxon, otherwise the function will fail.

## Value

Returns a vector where each element is a taxon with a list of each geographic range measure as a separate matrix of values. Measures include minimum spanning tree distance, minimum convex hull area, maxmimum pairwise great circle distance, latitudinal range, longitudinal range, and number of degree X degree cells occupied.

## Note

If PEE values are to be calculated as a next step the steps parameter needs to have a value of 1 as its first value

 ```1 2 3 4 5 6``` ```## Not run: data(BivalvePBDB) BivalveMatrix<-CoordList_PBDB(BivalvePBDB) GeoRarefaction_MultiTaxa(nLocCut=20,OccMatrix=BivalveMatrix,TaxaStart=3,replacePts=TRUE) ## End(Not run) ```