subgrid | R Documentation |
These functions may be used to define subdomains (i.e. a
rectangular subset of grid points) of any geofield
domain.
subgrid(geo, x1, x2, y1, y2, reso = 1)
zoomgrid(geo, x, y, zoom = 50)
geo |
A |
x1 , y1 |
Matrix index of the SW corner of the subdomain. |
x2 , y2 |
Matrix index of the NE corner of the subdomain. |
reso |
Resolution of the subdomain. It may be any positive integer. If reso is an integer larger than 1, the resolution is dropped by taking only a subset of points with interval reso. Default is 1 (all gridpoints are kept). |
x , y |
Matrix index of the central point of a 'zoomed' grid. |
zoom |
The number of matrix points at either side of the central point of the subgrid. |
zoomgrid
is in fact just a wrapper for a particular type of call to subgrid
, which is a bit more general. Note that there is no interpolation of any kind involved in these routines. It is simply a subselection of grid boxes. This could also be interpreted as a version of regrid(...,method="closest")
.
A geofield
object with a regular subset of the grid. If the input is a geodomain
, then the result is too.
regrid
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