[R] taking a small piece of large tiff

[Ben Tupper]

Hi,

You'll get a lot of help if you take this question to the R-sig-geo list 

https://stat.ethz.ch/mailman/listinfo/r-sig-geo

In the meantime, you might want to try reading this using raster::raster() and then cropping to your desired region. Here's a discussion that may help you...

https://stat.ethz.ch/pipermail/r-sig-geo/2010-July/008838.html

You will find many other useful bits using Rseek.org - try http://rseek.org/?q=subset+large+geotif

Cheers,
Ben

> On Apr 5, 2017, at 3:23 AM, Louisa Reynolds via R-help <r-help at r-project.org> wrote:
> 
> Ok. I have a tiff of size over 2GB. It covers a sixth of the Earth's surface and I'm trying to cut a UK piece out of it. The tiff I start with seems to be too large for R to handle. 
> 
> 
> Sent from my iPhone
> 
>> On 4 Apr 2017, at 18:37, jim holtman <jholtman at gmail.com> wrote:
>> 
>> How big is 'large'?
>> 
>> Jim Holtman
>> Data Munger Guru
>> 
>> What is the problem that you are trying to solve?
>> Tell me what you want to do, not how you want to do it.
>> 
>> 
>> On Tue, Apr 4, 2017 at 7:47 AM, Louisa Reynolds via R-help
>> <r-help at r-project.org> wrote:
>>> Dear Forum
>>> I am trying to cut out a small section of a very large 2-dimensional grayscale image as a tiff in R, but it is having difficulty handling such large files.  I have looked at bigmemory and ff packages but it is unclear how I can use these packages with tiffs. Can anyone please suggest something? I have tried tiff and rtiff libraries.
>>> Thanks in advance.
>>>       [[alternative HTML version deleted]]
>>> 
>>> ______________________________________________
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>>> and provide commented, minimal, self-contained, reproducible code.
> 
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

Ben Tupper
Bigelow Laboratory for Ocean Sciences
60 Bigelow Drive, P.O. Box 380
East Boothbay, Maine 04544
http://www.bigelow.org