Convert ESRI grids to .asc on R

[Gabriel Costa]

Anybody could help me on how to Convert ESRI grids to .asc on R?
Thanks in advance,
Gabriel

Gabriel Costa
-------------------------------------------------------------------------------------------
Universidade Federal do Rio Grande do Norte
Centro de Biociências, Departamento de Botânica, Ecologia e Zoologia.
Campus Universitário - Lagoa Nova
59078-900 - Natal, RN - Brasil

[David Galbraith]

If you have an ESRI license, there's a 'conversion toolbox' that might let you export to .asc format, of maybe a right-click -> "export data' option.  You still have to watch out for maximum file size issues though, and local memory/heap space stuff if you are dealing with large data sets and/or operating system limitations.

There are also multiple options involving R, GRASS, and linux-Java-Googly type paths to attempt in the absence of ESRI license realities, but the learning curves' steepness and vertical ranges can become problematic for some projects' goals and limitations.

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[Jesse Langdon]

You can use the Multidimension Tools in ArcGIS. I'm not sure if
ArcView has those tools, or just ArcEditor and above...

Good luck.

Jesse

[John B]

Hi Gabriel,

There are a few packages that will allow you to do this in R, with the help of GDAL.

A couple of methods that might work for you are:

# Using sp and rgdal packages

# install.packages(c('sp', 'rgdal'))

library(sp)

library(rgdal)

x <- readGDAL('path/to/ESRI/ASCII/binary/grid/')

write.asciigrid(x, 'path/to/output/filename.asc')

# Using raster package

# install.packages('raster')

library(raster)

x <- raster('path/to/ESRI/ASCII/binary/grid/')

writeRaster(x, 'path/to/output/filename.asc', NAflag=-9999)

Good luck,

John

[Gabriel Costa]

Thanks John,

That sounds great! 

Gabriel

Gabriel Costa
-------------------------------------------------------------------------------------------
Universidade Federal do Rio Grande do Norte
Centro de Biociências, Departamento de Botânica, Ecologia e Zoologia.
Campus Universitário - Lagoa Nova
59078-900 - Natal, RN - Brasil

Fone: 55-84-3215-3441 ramal 220
Fax: 55-84-3211-9205
http://web.mac.com/costagc
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[Anne Ghisla]

On Sat, 29 Oct 2011 19:38:36 -0400
David Galbraith <davidmg...@gmail.com> wrote:

> If you have an ESRI license, there's a 'conversion toolbox' that
> might let you export to .asc format, of maybe a right-click ->
> "export data' option. You still have to watch out for maximum file
> size issues though, and local memory/heap space stuff if you are
> dealing with large data sets and/or operating system limitations.
>
> There are also multiple options involving R, GRASS, and
> linux-Java-Googly type paths to attempt in the absence of ESRI
> license realities, but the learning curves' steepness and vertical
> ranges can become problematic for some projects' goals and
> limitations.

Hello list,

The limitations of the ESRI license costs can be problematic too, and I
find wise to have at least one ready-to-use alternative to ESRI before
there is urgent need of it, with no time to learn to use a new tool.

Some solutions consist of few lines of code, like John Baumgartner
showed in his response to this thread, or few clicks in a graphical
interface. I encourage the posting of diverse solutions to the same
question/problem, so that everyone can pick the most suitable for
his/her needs.

All the best!

Anne Ghisla
Edmund Mach Foundation
Research and Innovation Centre
Department of Biodiversity and Molecular Ecology
GIS and Remote Sensing Unit
--
http://gis.cri.fmach.it/ghisla/

[David Galbraith]

Excellently put, and also there's always the danger of proprietary updates which cause incompatibility issues when combining multiple code packages.