[R-sig-Geo] Recs for R tools that subset/tile raster bricks?

[Michael Sumner]

Try crop() (or more abstractly extract(raster, cells) once you've
determined which cells x-y are needed).

Getting the most efficient way to do this depends on the source of the
brick. It's not possible to know without knowing details on your setup. The
file format, method of creation and dimensions of the brick and sizes of
your subset query can all affect the best ways to go.

Happy to help but it might take a bit of conversation to figure out what's
best. If you can share the output of print on the brick anf the extent of a
subset that is a good start.

Cheers, Mike

On Thu, 25 May 2017, 05:50 Megan Maloney <maloneymc at appstate.edu> wrote:

> Hello all,
>
> Does anyone know of a good R tool to subset/tile raster bricks?
>
> I'd like to break a raster brick into smaller pieces to process. I'm
> finding functions to subset or tile a single raster layer, but not for
> multi-layer raster bricks.
>
> The brick input is hyperspectral flightlines - very large, 1 m^2 resampling
> covering a watershed, 340 layers. My code currently takes in a raster
> brick, extracts values per cell, applies beta coefficients, and outputs a
> nitrogen value to a raster.
>
> I don't need the subsets/tiles to be a particular size or number, just
> smaller. I was warned against dropping a whole flightline into R. I'm new
> to
> R, so I'm not sure what limitations I'm running into except processing
> time.
> All advice is welcome.
>
> Thank you very much for your help.
> Megan
>
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-- 
Dr. Michael Sumner
Software and Database Engineer
Australian Antarctic Division
203 Channel Highway
Kingston Tasmania 7050 Australia

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