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 <[EMAIL PROTECTED]> To: [EMAIL PROTECTED] Cc: [email protected]; Juliane Struve <[EMAIL PROTECTED]> 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 <[EMAIL PROTECTED]>: > > 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 > > [email protected] > > 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: [EMAIL PROTECTED] > > > _______________________________________________ > R-sig-Geo mailing list > [email protected] > https://stat.ethz.ch/mailman/listinfo/r-sig-geo > [[alternative HTML version deleted]] _______________________________________________ R-sig-Geo mailing list [email protected] https://stat.ethz.ch/mailman/listinfo/r-sig-geo ___________________________________________________________ Yahoo! For Good helps you make a difference http://uk.promotions.yahoo.com/forgood/ _______________________________________________ R-sig-Geo mailing list [email protected] https://stat.ethz.ch/mailman/listinfo/r-sig-geo
