Snap Area of Interest — aoi

Adjusts the area of interest to the nearest 100m. Note that this package assumes to data is in a metric equal area projection.

Usage

aoi_snap(aoi, method = c("expand", "shrink"))

Arguments

aoi: is a sf object (e.g. polygon). The bounding box of the shape will be used to create rectangular shape.
method: Options are shrink or expand. Shrink will snap the aoi in to the nearest 100m. Expand will snap the aoi out to the nearest 100m.

Value

a sf polygon

Details

This is an essential first step. As subsequent co-variate layers will be generated at multiple resolutions (e.g. 5, 10, 25m^2) and then disaggregate'd back to the lowest resolution. Having the aoi set 100m break-points facilitates this.

Examples

## Load sf object
aoi_raw <- sf::st_read(dsn = "../data/Block_aoi.gpkg", quiet = TRUE)
#> Error: Cannot open "../data/Block_aoi.gpkg"; The file doesn't seem to exist.
## snap aoi to nearest 100m
aoi_snap(aoi_raw)
#> Error in sf::st_bbox(aoi): object 'aoi_raw' not found
##
## [1] "initial extent is:"
## xmin      ymin      xmax      ymax
## 559691.2 5994955.0  560687.0 5995832.5
## [1] "Expanded extent is:"
## xmin    ymin    xmax    ymax
## 559600 5994900  560700 5995900