## Introduction
This dataset holds a collection of 3DTiles (https://github.com/CesiumGS/3d-tiles)
tile-sets of various boroughs of the Metropolis of Lyon. Those tileset are 
data derived from Grand Lyon Open data (https://data.grandlyon.com) and were
computed by the VCity team of the LIRIS lab (https://projet.liris.cnrs.fr/vcity/)

## License
This dataset is published under the ETALAB v2.0 open license (refer to file
ETALAB-Licence-Ouverte-v2.0_EN.pdf within this directory).

## Tilesets naming scheme
The sub-directories names are of general form
   <borough>_<vintage>[-<specificity>]_[TileSet|TileSets]
where
  * <borough> designates a location of the Lyon Metropolis e.g. "bron",
  * <vintage> indicates a year based vintage e.g. "2009",
  * [-<specificity>] is a comment concerning/charaterizing the tileset, and
  * [TileSet|TileSets] indicates whether the sub-dirctory holds a single
    tileset (for "TileSet") or a set of sub-directories each holding a tileset
    (for "TileSets")

For example, 
 * `Limonest_2015_TileSet` concerns the Limonest borough for the 2015 vintage 
   and holds a single tileset (as indicated by the trailing `TileSet` string).
 * `Limonest_Temporal-2009-2012-2015-graph-version_TileSet` also concerns the
   Limonest borough, the string `Temporal-2009-2012-2015` indicates it is a
   temporal tileset (an extension of vanilla 3DTiles) for the three vintages
   2009, 2012 and 2015, the string `-graph-version` indicates that this tileset
   features a "graph" (for what it may mean) and holds a single tileset (as
   indicated by the trailing `TileSet` string).
 * `Lyon-Villeurbanne-Bron_2015_TileSet` is a singe tileset for vintage 2015
   that gathers three boroughs Lyon (full city), Villeurbanne and Bron.
 * `Lyon1-Lyon2-Lyon5_2015-multi-layers_TileSets` has a trailing `TileSets`
   (plural) indicating that the directory holds many tilesets (each in its
   own subdirectory) and the `-multi-layers` optional comment indicates that
   each sub-directory probably holds a different layer of data