poocs_thinOccs Thin occurrences
poccs_thinOccs.RdThe function thins the observed occurrences by a user provided distance.
Arguments
- occs
data frame of cleaned occurrences obtained from component occs: Obtain occurrence data
- thinDist
distance in kilometers to be used for thinning. Number must be positive.
- logger
Stores all notification messages to be displayed in the Log Window of Wallace GUI. Insert the logger reactive list here for running in shiny, otherwise leave the default NULL.
- spN
data frame of cleaned occurrences obtained from component occs: Obtain occurrence data. Used to obtain species name for logger messages.
Value
Output is a data frame of thinned occurences (all occurences at a distance >thinDist) with the same columns as occs
Details
This function is called by the component poccs: process occurrence data to thin the occurrence data to a user specified distance. Providing an output with preserved columns appropriate for further analyses and a maximized number of occurrences that are separated by at least the provided distance.
Examples
occs <- read.csv(system.file("extdata/Bassaricyon_neblina.csv",
package = "wallace"))
occs$occID <- 1:nrow(occs)
out.thin <- poccs_thinOccs(occs = occs, thinDist = 30)
#> Spatially thinning for species...
#> Total records thinned (30 km) to 14 localities