All Return Text File (All Return) 
All collected data delivered in ASCII text file format (space delimited) with the following columns:

• Class:   3 for ground,  5 for non-ground (classification)
• Echo Type:  first, last or only return
• Index: line number in file
• Intensity 
• Line:  flightline number
• Time: not reliable, should be discarded 
• Easting (US feet) 
• Northing (US feet) 
• Elevation (Othometric US feet) 

Data is delivered by 1/25th of a USGS quarter quad in gzipped .txt files

NOTE:  The all-returns ASCII files for the 2005 Olympic Peninsual Project do not have the same attributes as the other 2005 projects.