SkyServer: GLossary
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TilingBoundaryA TilingBoundary is a set of "rectangles" that defines the area of the sky that may be tiled in a TileRun. Only targets from within the union of the TilingBoundaries for a TileRun may be assigned to Tiles created during a TileRun. A single TilingBoundary must be contained within a single chunk.