Description Usage Arguments Details Value Slots Note Author(s) See Also Examples
SField: a Class for Spatial Fields (Objects)
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observations |
object of one of the sublasses of Spatial |
domain |
object of class SExtent, or of a subclass of Spatial; if missing, it is assumed to be identical to |
cellsArePoints |
logical; do grid cell values reflect point values at the grid cell centre (TRUE) or constant point values throughout the whole grid cell (FALSE)? |
A class to store spatial fields, such as temperatures, elevation, land use, and so on, which have point support (footprint), along with the domain for which the set observation are valid e.g. to make interpolations.
Fields are representations of continuous phenomena: at every point in continuous space, a value exists. Observations on fields are, by necessity, discrete and countable when they refer to points, but may also consist of areas in which case an infinite number of points with constant value in the area is represented.
SField objects can be generated from points, lines, polygons or grids. For all classes except points, the attribute values are assumed to be constant and identical for all points along the line (lines), or over the area (polygons, grids).
The domain of a SField object is the area for which the observations are considered relevant, e.g. by affording interpolation or aggregation.
object of class SField-class
observations
:object of a subclass of Spatial
domain
:object of class SExtentOrNULL-class
cellsArePoints
logical; do grid cell values reflect point values at the grid cell centre (TRUE) or constant point values throughout the whole grid cell (FALSE)?
If no domain is supplied, the domain is set to the collection of features. A warning is issued if one or more of the features are (completely) outside the domain.
Edzer Pebesma
SObjects
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