Add "tile pyramid" to terms and definitions

[jyutzler]

Does anyone have a suitable definition to add to Annex B.2?

[jyutzler]

Assigned to Luciad.

[fhoubie]

After internal discussions, what about reusing definition of tile matrix set from WMTS ?

tile
a rectangular pictorial representation of geographic data, often part of a set of such
elements, covering a spatially contiguous extent and sharing similar information content
and graphical styling, which can be uniquely defined by a pair of indices for the column
and row along with an identifier for the tile matrix.

tile matrix
a collection of tiles for a fixed scale

tile matrix set
a collection of tile matrices defined at different scales

[pepijnve]

that would make a lot of sense since the tiles part of the spec was (intentionally) modelled after WMTS.

[jyutzler]

👍