classRaster: Definition of 'ursaRaster' class.

In ursa: Non-Interactive Spatial Tools for Raster Processing and Visualization

Definition of ursaRaster class.

Description

ursaRaster is S3 class for manipulation with georeferred raster images. See ‘Value’ section.
is.ursa checks inhering to class ursaRaster

Usage

## S3 method for class 'ursaRaster'
print(x, digits = NA, grid = FALSE, raw = FALSE, caption = FALSE, ...)

## S3 method for class 'ursaRaster'
str(object,...)

is.ursa(obj, ref = NULL)
is_ursa(obj, ref = NULL)

Arguments

x, object	ursaRaster object.
obj	Any.
digits	Passed to format function
grid	Logical. If grid=TRUE then returns simplified metadata.
raw	Logical. If FALSE and values are categories, then attempting to restore numeric values from categorical names is before calculating of statistics. If TRUE then values for statistics are used as is. Default is FALSE.
caption	Logical of character. Print title or other identificational info. If logical and TRUE then print variable name or character representation of expression. If non-zero length character, then print this value. If FALSE (default) or zero-length character, then no header for printing.
...	Passed to format function
ref	Character or NULL. If character, then checking of ursaRaster sub-class(es): Pattern Description NULL ursaRaster (raster|brick|ursa) ursaRaster grid ursaGrid (ct|color|table) ursaColorTable stack ursaStack con ursaConnection val ursaNumeric OR ursaCategory cat ursaCategory

Details

is.ursa() is designed mainly for developers to check arguments' class in function's call. is_ursa is a synonym to is.ursa.
Stucture of ursaRaster class is generated by non-public .raster.skeleton() function.

Value

ursaRaster is R's S3 class. It is a list with items:

grid	Geospatial properties. ursaGrid object
con	Connection properties.ursaConnection object
value	2-dimensional numerical or integer matrix of classes ursaValue in (spatial, temporal) specification formed from (samples*lines, bands). If data are not in memory, then NA.
dim	Dimension of $value. If bands are interpreted as observations in time, then it is spatial by temporal dimension of data. Even data are not in memory, dim is a dimension of whole data.
name	Band names
colortable	Color table. ursaColorTable object

is.ursa(x) returns TRUE, if class of x is ursaRaster

Author(s)

Nikita Platonov [e-mail]

Examples

session_grid(NULL)
print(methods(class="ursaRaster"))

a <- pixelsize()
print(a)
print(a,grid=TRUE)
s <- substr(as.character(sessionInfo()),1,48)
b <- rep(a,length(s))
bandname(b) <- s
print(b)

require(datasets)
data(volcano)
print(is.ursa(a))
print(is.ursa(volcano))
print(is.ursa(as.ursa(volcano)))

ursa documentation built on April 3, 2025, 6 p.m.