Can somebody confirm whether raster::values(x, format = "") always starts in the top-left of the image and moves left-to-right then top-to-bottom? I'm really hoping it doesn't depend on the pixel order of the underlying raster. Thanks, Oliver
raster package, values pixel order
3 messages · Roman Luštrik, Oliver Soong
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Ah, thanks for pointing out the definition of cell order. The documentation for raster::values doesn't specify that values(rasterLayer, format = "") always returns values in cell order, nor does it state that values(rasterStack) or values (rasterBrick) returns rows in cell order, so I wanted to check. Oliver
On Tue, Feb 7, 2012 at 3:57 PM, Roman Lu?trik <roman.lustrik at gmail.com> wrote:
From the package vignette (try vignette("Raster")):
The cell number is an important concept in the raster package. Raster data
can be thought of as a matrix, but in a RasterLayer it is more commonly
19
treated as a vector. Cells are numbered from the upper left cell to the
upper
right cell and then continuing on the left side of the next row, and so on
until the
last cell at the lower-right side of the raster.
There are several helper functions
to determine the column or row number from a cell and vice versa, and to
determine the cell number for x, y coordinates and vice versa.
Cheers,
Roman
On Wed, Feb 8, 2012 at 12:12 AM, Oliver Soong <osoong+r at gmail.com> wrote:
Can somebody confirm whether raster::values(x, format = "") always starts in the top-left of the image and moves left-to-right then top-to-bottom? I'm really hoping it doesn't depend on the pixel order of the underlying raster. Thanks, Oliver
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