Description Usage Arguments Details Value Author(s) Examples

`create.pgrid`

creates a grid of locations from the boundaries of domain and other information.

1 2 | ```
create.pgrid(xmin, xmax, ymin, ymax, nx, ny, midpoints = FALSE,
poly.coords = NULL)
``` |

`xmin` |
The minimum value of the boundary of the x coordinates of the spatial domain. |

`xmax` |
The maximum value of the boundary of the x coordinates of the spatial domain. |

`ymin` |
The minimum value of the boundary of the y coordinates of the spatial domain. |

`ymax` |
The maximum value of the boundary of the y coordinates of the spatial domain. |

`nx` |
The number of gridpoints/cells/pixels in the x direction. |

`ny` |
The number of gridpoints/cells/pixels in the y direction. |

`midpoints` |
A logical value ( |

`poly.coords` |
An |

The key argument in the function midpoints. If this is `TRUE`

, it is assumed that the boundaries of the spatial domain correspond to the midpoints of the cell/pixel in the grid. Otherwise, it is assumed that the boundaries correspond to the actual borders of the region of interest. If `poly.coords`

is supplied, the grid returned is the grid of midpoints contained in the convex hull of `poly.coords`

.

Returns an object of class `pgrid`

with the following components:

`pgrid` |
An |

`m` |
The number of rows in pgrid. |

`p.in.grid` |
A vector of 0s and 1s indicating whether the midpoint of each pixel is in the convex hull of |

`ubx` |
The pixel boundaries in the x direction. |

`uby` |
The pixel boundaries in the y direction. |

`upx` |
The pixel midpoints in the x direction. |

`upy` |
The pixel midpoints in the y direction. |

Joshua French

1 2 | ```
pgrida <- create.pgrid(0, 1, 0, 1, nx = 50, ny = 50, midpoints = FALSE)
pgridb <- create.pgrid(.01, .99, .01, .99, nx = 50, ny = 50, midpoints = TRUE)
``` |

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