Tightly packed RGBA bytes, four channels per pixel; no row padding.
Number of rows in original normalized pixels.
OptionalvalidFalse marks unavailable source data without changing search geometry.
Number of columns in original normalized pixels.
Horizontal pixel-edge offset in the containing image.
Vertical pixel-edge offset, increasing downwards.
Tiles partition the raster; no overlaps/gaps. Missing data uses alpha=0 or valid=false.