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readAsciiGrid memory issues

2 messages · Alexander.Herr at csiro.au, Roger Bivand

Alexander.Herr at csiro.au
# 
Hi List,

I am unable to read in a 7.8Gb ascii grid using readAsciiGrid {maptools} - R runs out of memory. I have 4Gb ram and 4Gb swap, so things are getting tight.

I am wondering if anyone has alternative options (preferably with example) that enable to read in large grids, do some calculations and save a new grid?

I am running linux 64bit on opensuse11 and R 2.8.0

Thanx
Herry
Roger Bivand
# 
<Alexander.Herr <at> csiro.au> writes:
runs out of memory. I have 4Gb ram
This function is written for small rasters only, and is not suited to data of 
this size.
that enable to read in large
Use rgdal, preferably using a tiled approach, leaving at least 75% of your 
memory free initially, because operations on the tile will result in copies. 
See several threads on R-sig-geo on handling large data sets, including one at:

https://stat.ethz.ch/pipermail/r-sig-geo/2008-November/004486.html

Also visit the raster package on R-Forge, which may offer a packaged solution to
this.

Roger Bivand