create.grid: Create a grid using latitude and longitude values.

In Vin985/ecapputils: Compilation of useful functions for EC applications

Description

This function creates a SpatialPolygonsDataFrame grid using the boundaries and cell size selected by the user.

Usage

create.grid(Latitude = c(45, 52), Longitude = c(-70, -56),
  Grid.size = c(0.1, 0.1), Clip = FALSE, clip.shape, hexgrid = FALSE,
  hexproj = "+proj=lcc +lat_1=46 +lat_2=60 +lat_0=44 +lon_0=-68.5 +x_0=0 +y_0=0 +datum=NAD83 +units=m +no_defs +ellps=GRS80 +towgs84=0,0,0",
  projection = NULL)

Arguments

Latitude	A pair of coordinates that identifies the grid northern and southern limits.
Longitude	A pair of coordinates that identifies the grid eastern and western limits.
Grid.size	size of the grid cells in km.
Clip	Should the grid be clipped with a shapefile (TRUE) or not (FALSE).
clip.shape	Shapefile to use to clip the grid if Clip is set to TRUE
projection	coordinate reference system ID for the grid.
x	A data.frame containing observations.

Details

The projection used for the grid must match the projection used for the dataset if you want to use the grid for effort.grid and species.grid.

Author

Christian Roy

note

Large grid with small cell size can take a while to create. Be patient.

Examples

new.grid<-create.grid(Latitude=c(45, 54), Longitude=c(-70, -56), Grid.size=c(25000, 25000), Clip=FALSE, clip.shape=canshp, projection=NULL)
#plot the grid
plot(new.grid, axes=T)
#END

Vin985/ecapputils documentation built on May 9, 2019, 9:56 p.m.