R: Divide a Grid Square into a selected number of subgrids

geojson_grid

R Documentation

Divide a Grid Square into a selected number of subgrids

Description

Divide a Grid Square (GS) into a selected number of subgrids (rows, cols). This function is useful for anyone who want to survey systematicaly a GS (~ 24km * 28 km) by dividing this GS in many smaller grids (numbered from GS.1 to GS.n). By default, GS are divided into 140 rows and 60 columns to fit with a Google Earth scale ("distance to your eye") that correspond to 300 m in a way each subgrid is entirely visible on a computer screen

Usage

geojson_grid(
  geojson.path = paste0(system.file(package = "eamenaR"), "/extdata/E42N30-42.geojson"),
  rows = 140,
  cols = 60,
  export = TRUE,
  fileOut = NA,
  dirOut = paste0(system.file(package = "eamenaR"), "/results/"),
  verbose = TRUE
)

Arguments

`geojson.path`	path of GeoJSON file. Default 'E42N30-42.geojson'
`rows`	number of cells in the X dimension. By default 140.
`cols`	number of cells in the Y dimension. By default 60.
`export`	if TRUE, export the GeoJSON file, if FALSE will only return it
`fileOut`	name of the exported GeoJSON with extension (ex: "E42N30-42_subgrids.geojson"). Default 'NA', will add "_subgrids" to the input GeoJSON
`dirOut`	folder where outputs will be saved. Default: '/results'. If it doesn't exist, will be created. Only useful is export.plot is TRUE.
`verbose`	if TRUE (by default), print messages.

Value

A GeoJSON file with the same extent as the input GeoJSON file, but divided in many smaller polygons numbered from 1 to ...

Examples


# Create a grid of 10 rows by 20 columns
geojson_grid(geojson.path = paste0(system.file(package = "eamenaR"),
                                          "/extdata/E42N30-42.geojson"),
             rows = 10,
             cols = 20)