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I have received ASCII data from a client. These ASCII files have been created from LiDAR data.

For each tile there are 4 different file types:

  • Filename.asc
  • Filename.asc.aux.xml
  • Filename.aux
  • Filename.rrd

What is the purpose of these files (asc.aux.xml, aux, .rrd)?

  • Are these ASCII files point cloud data or derived raster data? – Aaron Feb 5 '18 at 3:48
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These files are described in the ArcGIS Help:

A reduced resolution dataset (.rrd) file is one method of storing the pyramid layers for a raster dataset.

An auxiliary file (.aux or .aux.xml) accompanies the raster in the same location and stores any additional information that cannot be stored in the raster file itself.

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