How does the tile scheme work in the ASCII data?
PSLC LiDAR data is broken down into USGS quarter quads. ASCII data is further broken down into 25 tiles per quarter quad. Each quarter quad is subdivided into a 5 x 5 array of tiles organized from upper-left to lower-right as follows: 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 The two-digit tile number is appended to the end of the file name. There are two exceptions. One where the tile scheme is 1/64th of a quad. The projects affected are the Lewis County project in 2006 and the Eastern WA\OR River corridors flown in 2007. The other exception is the Sumpter Oregon project. This project has it’s own unique tiling scheme. See the individual project page for a shapefile of the tiling scheme and also the project report (for project flown in 2006 and beyond) for detail on the tiling scheme.
