def fetch_mosaic_definition(url: Union[str, Path]) -> Dict: """Fetch mosaic definition file.""" ... return mosaic_definition def _fetch_and_find_asset(url: str, x: int, y: int, z: int): mdef = fetch_mosaic_definition(url) return get_assets(mdef, x: int, y: int, z: int) def get_assets(mosaic_definition: Dict, x: int, y: int, z: int) -> list[str]: """Get asset list for a Z/X/Y index and a mosaic definition.   Parameters  ----------  mosaic_definition : dict  mosaic definition content.  x : int  Mercator tile X index.  y : int  Mercator tile Y index.  z : int  Mercator tile ZOOM level.   Returns  -------  assets : list  list of assets intersecting with the tile index.   """ min_zoom = mosaic_definition["minzoom"] mercator_tile = mercantile.Tile(x=x, y=y, z=z) quadkey_zoom = mosaic_definition.get("quadkey_zoom", min_zoom) # 0.0.2 # get parent if mercator_tile.z > quadkey_zoom: depth = mercator_tile.z - quadkey_zoom for i in range(depth): mercator_tile = mercantile.parent(mercator_tile) quadkey = [mercantile.quadkey(*mercator_tile)] # get child elif mercator_tile.z < quadkey_zoom: depth = quadkey_zoom - mercator_tile.z mercator_tiles = [mercator_tile] for i in range(depth): mercator_tiles = sum([mercantile.children(t) for t in mercator_tiles], []) mercator_tiles = list(filter(lambda t: t.z == quadkey_zoom, mercator_tiles)) quadkey = [mercantile.quadkey(*tile) for tile in mercator_tiles] else: quadkey = [mercantile.quadkey(*mercator_tile)] assets = list( itertools.chain.from_iterable( [mosaic_definition["tiles"].get(qk, []) for qk in quadkey] ) ) # check if we have a mosaic in the url (.json/.gz) return list( itertools.chain.from_iterable( [ fetch_and_find_assets(asset, x, y, z) if os.path.splitext(asset)[1] in [".json", ".gz"] else [asset] for asset in assets ] ) )