On Thu, 24 Apr 2014, Agus Camacho wrote:
Thanks for the fast response,
@ Barry
The .shp file is 420,241KB, the .shx is 6,994KB and the .dbf is 1,729,941KB.
@ Javier, id like to use the whole region.
But you'll never be able to render the detail in this coastline anyway.
Why not just use maptools::Rgshhs with the intermediate binary dataset,
setting a sensible bounding box? I've had trouble with the newest fine
data set and with the equivalent 2.3.0 shapefile (missing Norwegian
islands), but an older version (2.1.0) was fine.
Roger
Might be any easy way to reduce the number of vertex previously to import?
These shape files are available at:
http://mapas.mma.gov.br/mapas/aplic/probio/datadownload.htm
2014-04-24 13:02 GMT-03:00 Javier Garcia-Pintado <
j.garcia-pint...@reading.ac.uk>:
A possibility is, if you are interested in some specific area of the mata
atlantica, to crop the file externally with OGR just for your study area,
and read the cropped file into R.
Javier
---
__________
From: r-sig-geo-boun...@r-project.org [r-sig-geo-boun...@r-project.org]
on behalf of Barry Rowlingson [b.rowling...@lancaster.ac.uk]
Sent: 24 April 2014 16:58
To: Agus Camacho
Cc: r-sig-geo
Subject: Re: [R-sig-Geo] Importing only lines from big shape file
On Thu, Apr 24, 2014 at 4:47 PM, Agus Camacho <agus.cama...@gmail.com
wrote:
Dear Rgeos,
Id like to know if there is some workaround to import the lines
contained
by a shape file, avoiding memory problems when the only thing you need is
the lines it contains.
I mean, reading the lines of the world's coast lines can be done in a
instant with:
wcoastline <- PBSmapping::importShapefile("GSHHS_c_L1.shp")#
However, reading a relatively small region, like the brazilian atlantic
forest, seems impossible for my little laptop. I tried all of these
possibilities.
AF=PBSmapping::importShapefile("mata_atlantica.shp")
AF=rgdal::readOGR("dir",layer="mata_atlantica")
AF=shapefiles::read.shp("mata_atlantica.shp")
Any hint would be very welcome.
Ummm not sure this makes sense. You can read all the coastlines, but not
some of the coastlines?
Are the mata_atlantica files bigger because they are more detailed?
Sometimes global data is generalized.
Show us the size in bytes of the files...
Barry
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Roger Bivand
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