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Python: mbtiles_to_pmtiles(): set tile_compression = gzip when converting from MVT MBTiles

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Even Rouault
2023-06-09 19:36:02 +02:00
parent fec0d1136c
commit 8f9feca6e9
1 changed files with 8 additions and 7 deletions
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15
python/pmtiles/convert.py
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@@ -38,8 +38,8 @@ def mbtiles_to_header_json(mbtiles_metadata):
else:
header["tile_type"] = TileType.UNKNOWN
if mbtiles_metadata.get("compression") == "gzip":
header["tile_compression"] = Compression.GZIP # TODO: does this ever matter?
if tile_format == "pbf" or mbtiles_metadata.get("compression") == "gzip":
header["tile_compression"] = Compression.GZIP
else:
header["tile_compression"] = Compression.UNKNOWN
@@ -63,6 +63,11 @@ def mbtiles_to_pmtiles(input, output, maxzoom):
tileid_set.sort()
mbtiles_metadata = {}
for row in cursor.execute("SELECT name,value FROM metadata"):
mbtiles_metadata[row[0]] = row[1]
is_pbf = mbtiles_metadata["format"] == "pbf"
# query the db in ascending tile order
for tileid in tileid_set:
z, x, y = tileid_to_zxy(tileid)
@@ -73,14 +78,10 @@ def mbtiles_to_pmtiles(input, output, maxzoom):
)
data = res.fetchone()[0]
# force gzip compression only for vector
if data[0:2] != b"\x1f\x8b":
if is_pbf and 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)