density_plot_nn: Determine the rule-distance

In ISAAKiel/lecAAR: Largest Empty Circles after Zimmermann/Wendt 2003

Description

This function helps finding the rule-distance. It produces a SpatialPointsDataframe, calculates the nearest neighbour distance and plots a density curve for the to determine the rule-distance.

Usage

density_plot_nn(project_CRS, sites_table, xy, threshold = 10000,
  bin_width = 250, x_axis_steps = 1000)

Arguments

project_CRS	Coordinate Reference System of Project. Unit has to be metres.
sites_table	Dataframe or tibble containing individual sites in each row with two separate columns containing the coordinates
xy	Dataframe or tibble containing the coordinates in two separate columns
threshold	Threshold for nearest neighbour in metres. Default is 10000
bin_width	Bin width for density plot. Default is 250
x_axis_steps	Steps on x-axis in metres. Default is 500

Author(s)

David N. Matzig

Examples

# provide CRS and data
project_CRS <- "+init=epsg:32634"
sites_table <- bronze_age_fortifications
xy <- sites_table[,c("xUTM","yUTM")]
 
# create density plot
density_plot_nn(project_CRS, sites_table, xy)

# save rule-distance in variable 'rule_distance_value_m'
rule_distance_value_m <- 2500 

ISAAKiel/lecAAR documentation built on Oct. 30, 2019, 7:16 p.m.