Long time to load shapefiles

Thank you everyone for your answers. I think I'll just load it and save 
the workspace for further uses. I still wonder why this is taking such 
long time to load whereas in QGIS or ArcGIS it is a matter of seconds.
Why do you wonder? You could check instead, taking subsets of the fields, 
and subsets of the features in your object. You could also use alternative 
formats, but I don't think that the choice of driver is important here. 
Note that few statisticians would consider global analysis of data sets 
this large sensible unless very specific conditions were met; the 
additional variability after the first several thousand observations 
probably doesn't tell you much. Once the data are converted to sp classes, 
things go rather faster, as has been pointed out.

Roger
Have a great day,Phil

Date: Thu, 17 Oct 2013 17:19:39 +1100
Subject: Re: [R-sig-Geo] Long time to load shapefiles
From: mdsumner at gmail.com
To: pmassicotte at hotmail.com
CC: r-sig-geo at r-project.org

I have a similar spec to yours, with i7 instead.

I have successfully read it, but first time it crashed (I think
because memory was exhausted).

It took about 20min.

I would work on subsetting the part you want with an ogr2ogr
incantation if you want to stay away from GIS:
http://www.gdal.org/ogr2ogr.html

QGIS or similar would be able to read / crop this no-sweat, but it
depends on exactly how you want to subset it, and that may be a topic
for another forum

Cheers, Mike

On Thu, Oct 17, 2013 at 2:18 AM, philippe massicotte
<pmassicotte at hotmail.com> wrote:
Hi everyone.
I'm trying to open some shapefiles, but the process is still not complete after 25 minutes.  Looking at the shapefiles in ArcGIS, I find that these files have roughly 500K entries. I was wondering if this processing time to open the shapefiles is normal. Here is my configuration:
Intel i5-2500 @ 3.3 GHz16 GB of RAMWindows 7 (64 bits)
For information, you can download the shapefiles here:
http://www.usna.edu/Users/oceano/pguth/srtm/rivers.zip
Here is my code:
library(rgdal)shape=readOGR("af_riv_15s.shp", layer="af_riv_15s")

Thank you for your help,Phil

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Michael Sumner
Hobart, Australia
e-mail: mdsumner at gmail.com
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Roger Bivand
Department of Economics, NHH Norwegian School of Economics,
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voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no

Long time to load shapefiles

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