[R-sig-Geo] working with large ascii files in R

[Mauricio Zambrano-Bigiarini]

On 07/18/2013 09:26 AM, Roman Luštrik wrote:
> Have you considered updating your R and associated packages?

As Roman mentioned, I also suggest you, as first step, to update R (and 
all the packages) up to version 3 or higher, because one of the 
significant user changes introduced in R 3.0.0 was related to memory 
(from the NEWS file):

      "It is now possible for 64-bit builds to allocate amounts of
       memory limited only by the OS.  It may be wise to use OS
       facilities (e.g. ulimit in a bash shell, limit in csh), to set
       limits on overall memory consumption of an R process,
       particularly in a multi-user environment.  A number of packages
       need a limit of at least 4GB of virtual memory to load.

       64-bit Windows builds of R are by default limited in memory usage
       to the amount of RAM installed: this limit can be changed by
       command-line option --max-mem-size or setting environment
       variable R_MAX_MEM_SIZE."

Kind regards,

Mauricio Zambrano-Bigiarini, Ph.D

-- 
=================================================
Water Resources Unit
Institute for Environment and Sustainability (IES)
Joint Research Centre (JRC), European Commission
TP 261, Via Enrico Fermi 2749, 21027 Ispra (VA), IT
Work Phone : +39 0332 789588
webinfo    : http://floods.jrc.ec.europa.eu/
=================================================
DISCLAIMER:
"The views expressed are purely those of the writer
and may not in any circumstances be regarded as sta-
ting an official position of the European Commission"
=================================================
"The journey is the reward"  (Steve Jobs)

> There's also a plethora of other GUI based GIS systems. Just the other day,
> I found Quantum GIS to be very user friendly.
>
> That being said, I suggest you use R. :)
>
> Cheers,
> Roman
>
>
>
> On Thu, Jul 18, 2013 at 9:05 AM, Rocio Ponce <r.ponce.reyes at gmail.com>wrote:
>
>> Hi there,
>> I'm a newie in using R to make maps... I used to work with ArcGis but I ran
>> out of a valid license...
>>
>> I'm trying to crop the future Worldclim datasets layers which are huge
>> ascii files (of the whole world at 1km resolution, so they are between
>> 3-4GB each)  to the extent of Mexico using the library (raster).
>>
>> I used the following code:
>>
>>> setwd('G:/future_A2a/2020/bccr_bcm2_0_sres_a2_2020s/')
>>> maask<-  read.asc("C:/xalapa/worldclim_pres/bio01.asc",gz=FALSE)
>>> mask<-raster.from.asc(maask,projs=NA)
>>> files <- list.files(pattern='\\.asc$')
>>> s <- stack(files)
>>> crop(s, mask)
>> Error: cannot allocate vector of size 253.2 Mb
>>
>>
>> I'm using R.2.14.1 on a computer running on Windows XP
>> Any help that you could provide me would be greatly appreciated,
>>
>> Cheers,
>> Rocio
>>
>> --
>> Dr. Rocio Ponce-Reyes
>>
>> http://rocioponcereyes.wordpress.com/
>>
>> (disculpe la falta de acentos en este correo electronico)
>>
>>          [[alternative HTML version deleted]]
>>
>> _______________________________________________
>> R-sig-Geo mailing list
>> R-sig-Geo at r-project.org
>> https://stat.ethz.ch/mailman/listinfo/r-sig-geo
>>
>
>
>