sf_studyArea: Make Study Area Polygons

In jacpete/jpfxns2: Second Interation of JP Functions - Purdue Edition

Description

Make study area polygons from the extent (bbox) of an sf layer. Includes scaling options to increase or decrease size of the polygon by a ratio or by a distance calculated in map units. Because of this, the distance parameter only works for projected layers.

Usage

sf_studyArea(sfLayer, ratio = 1, dist = NULL)

Arguments

sfLayer	sf object
ratio	Numerical vector of length 1 or 2 (as it pertains to the x,y axes). Default: 1 to create a basic study area polygon for the sfLayer. Ignored if a dist is given.
dist	Numerical vector of length 1 or 2 (as it pertains to the x,y axes). Default: NULL.

Value

Returns a polygon sf layer that is a rectangle.

Creation notes

First created on 2019-Apr-22 while working on my IBM class project.

Future directions

I may need to add checks to make sure negative distance values won't flip the min and max values in the extent creation section.

jacpete/jpfxns2 documentation built on May 10, 2020, 9:15 p.m.