[R-sig-Geo] Reading an ArcGIS raster file

[Juliane Struve]

Hello Giovanni,

thank you very much for your helpful comments. I have just started working on this project and my experience on the data structure and files both in ArcGIS and R are yet limited. I will try to export the relevant data file as you suggested.

Best wishes,

Juliane 

 
Dr. Juliane Struve
Adjunct Environmental Scientist
Mote Marine Laboratory
Center for Fisheries Enhancement
1600 Ken Thomson Parkway
Sarasota, Florida, 34236
(941)388-4441 Ext. 408


----- Original Message ----
From: G. Allegri <giohappy at gmail.com>
To: Roger.Bivand at nhh.no
Cc: r-sig-geo at stat.math.ethz.ch; Juliane Struve <juliane_struve at yahoo.co.uk>
Sent: Saturday, 5 April, 2008 8:08:13 AM
Subject: Re: [R-sig-Geo] Reading an ArcGIS raster file

Are you sure you have the data stored in AUX? ArcGIS Desktop uses an AUX
file for images that do not support storing coordinate system information
internally. The image header and AUX file tells ArcMap about the coordinate
system including units and projection.
It happens that AUX files are created also when ArcGIS produce image
pyramids.
I suggest to export your data in Arc/Info Binary Grid, a format easily
handled by GDAL [1] . In this case you have to point gdal to the "hdr.adf"
file (one of the many *.adf files produces while exportiong), which is the
header file.

Giovanni

[http://www.gdal.org/frmt_various.html#AIG]

2008/4/5, Roger Bivand <Roger.Bivand at nhh.no>:
>
> On Sat, 5 Apr 2008, Juliane Struve wrote:
>
> > Dear members,
> >
> > how can i read and plot an ArcGis raster file? The .aux file contains
> > floating point bathymetry values. I have managed to read and plot a
> > shoreline using rgdal, maptools and PBSmapping, but I am stuck now. Any
> > help would be much appreciated.
>
>
> ?readGDAL perhaps? What other files do you have, just an *.aux? Is this a
> PCI *.aux file where the real file is *?
>
> Which OS (Windows I guess)?
>
> By the way, ther is no "aux" on:
>
>
> http://webhelp.esri.com/arcgisdesktop/9.2/index.cfm?TopicName=Supported_raster_dataset_file_formats
>
> Roger
>
>
> >
> > Regards,
> >
> > Juliane
> >
> >
> >
> >      ___________________________________________________________
> > Yahoo! For Good helps you make a difference
> >
> > http://uk.promotions.yahoo.com/forgood/
> >
> > _______________________________________________
> > R-sig-Geo mailing list
> > R-sig-Geo at stat.math.ethz.ch
> > https://stat.ethz.ch/mailman/listinfo/r-sig-geo
> >
>
>
> --
> Roger Bivand
> Economic Geography Section, Department of Economics, Norwegian School of
> Economics and Business Administration, Helleveien 30, N-5045 Bergen,
> Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
> e-mail: Roger.Bivand at nhh.no
>
>
> _______________________________________________
> R-sig-Geo mailing list
> R-sig-Geo at stat.math.ethz.ch
> https://stat.ethz.ch/mailman/listinfo/r-sig-geo
>

    [[alternative HTML version deleted]]

_______________________________________________
R-sig-Geo mailing list
R-sig-Geo at stat.math.ethz.ch
https://stat.ethz.ch/mailman/listinfo/r-sig-geo


      ___________________________________________________________ 
Yahoo! For Good helps you make a difference  

http://uk.promotions.yahoo.com/forgood/