mirror of
https://github.com/protomaps/PMTiles.git
synced 2026-02-04 02:41:09 +00:00
140 lines
4.7 KiB
Python
140 lines
4.7 KiB
Python
# pmtiles to files
|
|
import gzip
|
|
import json
|
|
import os
|
|
import sqlite3
|
|
from pmtiles.writer import write
|
|
from pmtiles.reader import Reader, MmapSource
|
|
from .tile import zxy_to_tileid, tileid_to_zxy, TileType, Compression
|
|
|
|
|
|
def mbtiles_to_header_json(mbtiles_metadata):
|
|
header = {}
|
|
|
|
header["min_zoom"] = int(mbtiles_metadata["minzoom"])
|
|
del mbtiles_metadata["minzoom"]
|
|
|
|
header["max_zoom"] = int(mbtiles_metadata["maxzoom"])
|
|
del mbtiles_metadata["maxzoom"]
|
|
|
|
bounds = mbtiles_metadata["bounds"].split(",")
|
|
header["min_lon_e7"] = int(float(bounds[0]) * 10000000)
|
|
header["min_lat_e7"] = int(float(bounds[1]) * 10000000)
|
|
header["max_lon_e7"] = int(float(bounds[2]) * 10000000)
|
|
header["max_lat_e7"] = int(float(bounds[3]) * 10000000)
|
|
del mbtiles_metadata["bounds"]
|
|
|
|
center = mbtiles_metadata["center"].split(",")
|
|
header["center_lon_e7"] = int(float(center[0]) * 10000000)
|
|
header["center_lat_e7"] = int(float(center[1]) * 10000000)
|
|
header["center_zoom"] = int(center[2])
|
|
del mbtiles_metadata["center"]
|
|
|
|
tile_format = mbtiles_metadata["format"]
|
|
if tile_format == "pbf":
|
|
header["tile_type"] = TileType.MVT
|
|
elif tile_format == "png":
|
|
header["tile_type"] = TileType.PNG
|
|
elif tile_format == "jpeg":
|
|
header["tile_type"] = TileType.JPEG
|
|
elif tile_format == "webp":
|
|
header["tile_type"] = TileType.WEBP
|
|
else:
|
|
header["tile_type"] = TileType.UNKNOWN
|
|
|
|
if mbtiles_metadata.get("compression") == "gzip":
|
|
header["tile_compression"] = Compression.GZIP # TODO: does this ever matter?
|
|
else:
|
|
header["tile_compression"] = Compression.UNKNOWN
|
|
|
|
return header, mbtiles_metadata
|
|
|
|
|
|
def mbtiles_to_pmtiles(input, output, maxzoom):
|
|
conn = sqlite3.connect(input)
|
|
cursor = conn.cursor()
|
|
|
|
with write(output) as writer:
|
|
|
|
# collect a set of all tile IDs
|
|
tileid_set = []
|
|
for row in cursor.execute(
|
|
"SELECT zoom_level,tile_column,tile_row FROM tiles WHERE zoom_level <= ?",
|
|
(maxzoom or 99,),
|
|
):
|
|
flipped = (1 << row[0]) - 1 - row[2]
|
|
tileid_set.append(zxy_to_tileid(row[0], row[1], flipped))
|
|
|
|
tileid_set.sort()
|
|
|
|
# query the db in ascending tile order
|
|
for tileid in tileid_set:
|
|
z, x, y = tileid_to_zxy(tileid)
|
|
flipped = (1 << z) - 1 - y
|
|
res = cursor.execute(
|
|
"SELECT tile_data FROM tiles WHERE zoom_level = ? AND tile_column = ? AND tile_row = ?",
|
|
(z, x, flipped),
|
|
)
|
|
data = res.fetchone()[0]
|
|
# force gzip compression only for vector
|
|
if data[0:2] != b"\x1f\x8b":
|
|
data = gzip.compress(data)
|
|
writer.write_tile(tileid, data)
|
|
|
|
mbtiles_metadata = {}
|
|
for row in cursor.execute("SELECT name,value FROM metadata"):
|
|
mbtiles_metadata[row[0]] = row[1]
|
|
|
|
pmtiles_header, pmtiles_metadata = mbtiles_to_header_json(mbtiles_metadata)
|
|
result = writer.finalize(pmtiles_header, pmtiles_metadata)
|
|
|
|
conn.close()
|
|
|
|
|
|
def pmtiles_to_mbtiles(input, output):
|
|
pass
|
|
# conn = sqlite3.connect(output)
|
|
# cursor = conn.cursor()
|
|
# cursor.execute("CREATE TABLE metadata (name text, value text);")
|
|
# cursor.execute(
|
|
# "CREATE TABLE tiles (zoom_level integer, tile_column integer, tile_row integer, tile_data blob);"
|
|
# )
|
|
|
|
# with open(input, "r+b") as f:
|
|
# source = MmapSource(f)
|
|
# reader = Reader(source)
|
|
# metadata = reader.header().metadata
|
|
# for k, v in metadata.items():
|
|
# cursor.execute("INSERT INTO metadata VALUES(?,?)", (k, v))
|
|
# for tile, data in reader.tiles():
|
|
# flipped = (1 << tile[0]) - 1 - tile[2]
|
|
# cursor.execute(
|
|
# "INSERT INTO tiles VALUES(?,?,?,?)",
|
|
# (tile[0], tile[1], flipped, force_compress(data, gzip)),
|
|
# )
|
|
|
|
# cursor.execute(
|
|
# "CREATE UNIQUE INDEX tile_index on tiles (zoom_level, tile_column, tile_row);"
|
|
# )
|
|
# conn.commit()
|
|
# conn.close()
|
|
|
|
|
|
def pmtiles_to_dir(input, output):
|
|
pass
|
|
# os.makedirs(output)
|
|
|
|
# with open(input, "r+b") as f:
|
|
# source = MmapSource(f)
|
|
# reader = Reader(source)
|
|
# metadata = reader.header().metadata
|
|
# with open(os.path.join(output, "metadata.json"), "w") as f:
|
|
# f.write(json.dumps(metadata))
|
|
|
|
# for tile, data in reader.tiles():
|
|
# directory = os.path.join(output, str(tile[0]), str(tile[1]))
|
|
# path = os.path.join(directory, str(tile[2]) + "." + metadata["format"])
|
|
# os.makedirs(directory, exist_ok=True)
|
|
# with open(path, "wb") as f:
|
|
# f.write(force_compress(data, gzip))
|