calc_cf2pts: Central feature between 2 point patterns (CF2PTS) Calculator

In aspace: Functions for Estimating Centrographic Statistics

Central feature between 2 point patterns (CF2PTS) Calculator

Description

Central feature of point2 within point1. Identifies the central feature as the point location in the first pattern that has the smallest cummulative distance to features in a second point pattern.

Usage

calc_cf2pts(id=1, points1=NULL, points2=NULL, verbose=FALSE)

Arguments

id	A unique integer to identify the CF2PTS
points1	A 2-column matrix or data frame containing the first set of point observations
points2	A 2-column matrix or data frame containing the second set of point observations
verbose	A Boolean flag to control verbose reporting on monitor

Details

Use the LOCATIONS element in the output list object along with the ATTRIBUTES elements can be used to produce shapefiles or other vector point files for geographic data.

Value

The returned result is a list:

TYPE	The type of calculation results stored in the object: BOX, SDD, SDE, CMD, CF, or CF2PTS, MNC, MDC
DATE	The date and time that the function was run
ID	Identifier for the central feature - it should be unique
LOCATIONS	Locations pertinent for the CF2PTS that can be used with ATTRIBUTES if wishing to build a vector point file for geographic data outside of this pacakge.
FORPLOTTING	Coordinates and identifiers used for plotting.
ATTRIBUTES	Attributes for the output CF2PTS that can be used with LOCATIONS coordinates if wishing to build a vector point file for geographic data outside of this package.
id	Identifier for the central feature - it should be unique
CF2PTS.x	X-coordinate of the central feature
CF2PTS.y	Y-coordinate of the central feature

Note

Results specific for plotting are stored in the FORPLOTTING element within the produced list object. This function can be used on its own (once) or repetitively in a loop to process grouped point data stored in a larger table. When used repetitively, be sure to increment the id argument to ensure that each CF2PTS has a unique identifier.

Author(s)

Randy Bui, Ron Buliung

See Also

calc_box, calc_sdd, calc_sde, calc_cmd, calc_cf, calc_mnc, calc_mdc

Examples

# CF2PTS EXAMPLE
data(activities)
data(activities2)
a <- calc_cf2pts(id=1, points1=activities, points2=activities2)
str(a)
print(a)

# IF THE RESULT OF THIS FUNCTION IS STORED TO AN OBJECT, THE plot_box()
# FUNCTION WILL TAKE THAT OBJECT AS INPUT FOR PLOTTING VIA THE datin ARGUMENT

# CF2PTS TO SHAPEFILE EXAMPLE (REMOVE THE COMMENTS TO RUN)
# shp <- convert.to.shapefile(a$LOCATIONS, a$ATTRIBUTES, "id", 5)
# write.shapefile(shp, "CF2PTS_Shape", arcgis=T)

aspace documentation built on May 29, 2024, 2:04 a.m.