Hello Megan, Personally, I import my .img files with the package Raster.
Try: Elev <- stack("file_name.img") Than you can see the result with: Str(Elev) And something like: Plot(Elev) See: http://cran.r-project.org/web/packages/raster/raster.pdf For more details Bastien Ferland-Raymond, M.Sc. Stat., M.Sc. Biol. ------------------------------ Message: 6 Date: Mon, 30 Apr 2012 16:21:23 -0700 (PDT) From: Megan Marcotte < > To: r-sig-geo@r-project.org Subject: [ Message-ID: <1335828083349-7515387.p...@n2.nabble.com> Content-Type: text/plain; charset=us-ascii Hello, This is a rather low level question but I'd appreciate your help. I have given a colleague .img files from ArcMap 10 to import into R. I don't know R and she is new to ArcMap files and we are having trouble getting the files in. I was hoping some of you could set us straight on what we are doing wrong. When I look in ArcMap the file works well and contains data. There are 5 source files for the raster in ArcMap but only the .img, .img.vat.dbf, and .rrd files were attachable by email (so I did not send a disc image file or a lock file). My colleague has install RGDAL and GDAL (and other packages) and tried importing using functions raster and readGDAL to import the .img file, but gets the following errors: > Elev <- raster("file_name.img") Error in .rasterObjectFromFile(x, band = band, objecttype = "RasterLayer", : Cannot create a RasterLayer object from this file. > Elev <- readGDAL("file_name.img") Error in .local(.Object, ...) : Unable to open file_name.img, it has zero usable bands. (http://science.nature.nps.gov/im/monitor/stats/R/Data_io.cfm provided instructions) We would like to get the file successfully imported and have R know that the coordinates are in WGS84. Can anyone please advise us on how to accomplish this? The file is in .img format because I converted the coordinate system in ArcMap. If importing it in its native coordinate system and then converting to WGS84 in R is easier than I would gratefully accept help on that instead. Thanks so much! Megan -- View this message in context: http://r-sig-geo.2731867.n2.nabble.com/trouble-importing-a-img-file-from-ArcMap-10-tp7515387.html Sent from the R-sig-geo mailing list archive at Nabble.com. _______________________________________________ R-sig-Geo mailing list R-sig-Geo@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-geo