They are all extra things that GDAL does not need:
LYR is an ArcGIS layer file, it just stores symbology and so on about
how to represent data in ArcMap.
AUX is an auxiliary statistics file which ArcGIS generates for doing
stretches, histograms, etc
RRD is a pyramid file which ArcGIS generates to display raster data
faster at various scales
These files by themselves are not raster data - they will accompany
something else, i.e. a TIFF file or something like that.
State GIS Manager, Maine Office of GIS
State of Maine, Office of Information Technology
michael.smith _at_ maine.gov
Board Member, Maine GeoLibrary
Board Member, Maine GIS Users Group
State Rep, National States Geographic Information Council
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> I got some data in files which have aux, lyr and rrd extensions. I
> believe they are raster datasets in some ESRI or ERDAS formats.
> My GDAL did not recognize them immediately. Can somebody explain a bit
> what do I have?
.aux and .rrd files are companion files of ERDAS Imagine datasets (whose main
files are .img). GDAL is also able to read/generate .aux/.rrd as overviews of
other raster formats.
.lyr files are ESRI specific stuff (A search lead me to
http://www.lib.ncsu.edu/gis/formats.html ) and GDAL/OGR has no driver for that
one. Would be more the equivalent of a MapServer mapfile, or a QGIS project