The nScales value indicates the number of levels in the hierarchy, each at a different scale. The scale of the lowest layer must be specified. The higher layers are assumed to have scales multiplier times larger for each level. The lowest level tilesize is given in base units. To compute the tile size in pixels, divide by the scale .
All higher levels use the same size tiles.
The levels are GridImage layers. Tiles are numbered starting at the top level. The first tile in the top layer is number 1. Subsequent layers are numbered sequentially. In this case, the tiles are 100x100 pixels.