ursa_grid: Extract and assign spatial parameters of raster images.

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

Extract and assign spatial parameters of raster images.

Description

Raster image (ursaRaster) contains embedded spatial parameters (ursaGrid) in item $grid. These functions manipulate with item $grid.

Usage

ursa_grid(obj)
ursa_grid(obj) <- value

ursa_ncol(obj)
ursa_nrow(obj)
ursa_columns(obj)
ursa_rows(obj)
ursa_samples(obj)
ursa_lines(obj)

ursa_extent(obj)
ursa_bbox(obj)

consistent_grid(obj, ref, expand = 1, border = rep(0, 4), verbose = FALSE)

Arguments

obj	ursaRaster object. For ursa_grid function list of ursaRaster objects is allowed.
value	ursaGrid object.
ref	ursaGrid reference object.
expand	Podsitive numeric. Multiplier of boundary box.
border	integer of length 1 or 4. If length 4, then vector (bottom, left, top, right) in cells for extent expand. If length <4, then value is repeated for length 4. Passed to regrid().
verbose	Logical. Some output in console. Primarily for debug purposes.

Details

ursa_grid<- may used to minor corrections of spatial parameters. Howevert, it seems that this function is not claimed in practice.

ursa_ncol, ursa_columns, ursa_samples are synonyms for extracting number of columns/samples.

ursa_nrow, ursa_rows, ursa_lines are synonyms for extracting number of rows/lines.

ursa_extent, ursa_bbox, are synonyms for extracting boundary box (spatial extent).

consistent_grid trasforms dimension (ursa_nrow() by ursa_ncol()) obj-grid to dimension of ref-grid. This helpful for multipanel plotting if objects have different boundary boxes.

Value

ursa_grid return value of $grid item of ursaRaster object.

ursa_grid<- return ursaRaster with modified $grid item.

ursa_ncol, ursa_columns, ursa_samples return integer of length 1.

ursa_nrow, ursa_rows, ursa_lines return integer of length 1.

ursa_extent, ursa_bbox return numeric of length 4 (xmin, ymin, xmax, ymax).

ursa_consistent returns ursaGrid object.

Author(s)

Nikita Platonov [e-mail]

Examples

session_grid(NULL)
a <- pixelsize()
print(ursa_grid(a))
ursa_grid(a)$crs <- gsub("\\.0+","",ursa_grid(a)$crs)
print(ursa_grid(a))

ursa documentation built on Sept. 30, 2024, 9:35 a.m.