World file parameter creator

Source: R/grids.R

Basic function to create a 'world file' as used by various non-geo image formats

Reformat to world vector.

geo_world0(px, ul, sh = c(0, 0))

geotransform_to_world(x)

Arguments

px

pixel resolution (XY, Y-negative)
ul

grid offset, top-left corner
sh

affine shear (XY)
x

geotransform parameters, as per geo_transform0()

Value

vector of parameters xres, yskew, xskew, yres, xmin, ymax

world vector, as per geo_world0()

Details

Note that xmin/xmax are centre_of_cell (of top-left cell) unlike the geotransform which is top-left corner_of_cell. The parameters are otherwise the same, but in a different order.

See also

geo_transform0

Examples

geo_world0(px = c(1, -1), ul = c(0, 0))

#>  xres yskew xskew  yres  xmin  ymax 
#>   1.0   0.0   0.0  -1.0   0.5  -0.5 
(gt <- geo_transform0(px = c(1, -1), ul = c(0, 0)))

#>  xmin  xres yskew  ymax xskew  yres 
#>     0     1     0     0     0    -1 
wf <- geotransform_to_world(gt)
world_to_geotransform(wf)

#>  xmin  xres yskew  ymax xskew  yres 
#>     0     1     0     0     0    -1