=== versions ===
python 3.12.0 | geopandas 1.2.0 | pyogrio 0.13.0 (GDAL 3.12.4) | shapely 2.2.0
GDAL vector-tile drivers: PMTiles=rw  MVT=rw

=== load Part 1 GeoParquet ===
buildings 144,965 features  18.86 MB GeoParquet  crs OGC:CRS84
places     20,727 features   1.75 MB GeoParquet  crs OGC:CRS84
water         161 features   0.14 MB GeoParquet  crs OGC:CRS84
hex           758 features   0.08 MB GeoParquet  crs OGC:CRS84

=== buildings: maximum zoom vs size (MINZOOM=12, GDAL defaults otherwise) ===
zooms  tiles  size_MB  write_s  largest_tile_KB
12-12      6     1.37     11.6              495
12-13     22     3.38     25.6              495
12-14     77     5.64     39.9              495
12-15    243     8.18     54.8              495
12-16    840    11.25     69.8              495
per zoom level in the z12-16 archive (compressed tile sizes):
    tiles  total_KB  mean_KB  max_KB  tile_width_m  grid_step_m
z                                                              
12      6      1368    228.0     495          6096         1.49
13     16      2008    125.5     307          3048         0.74
14     55      2260     41.1     115          1524         0.37
15    166      2543     15.3      46           762         0.19
16    597      3067      5.1      16           381         0.09
z12: 135,534 feature pieces read back (a building cut by a tile edge counts once per tile)
z13: 145,961 feature pieces read back (a building cut by a tile edge counts once per tile)
z14: 147,295 feature pieces read back (a building cut by a tile edge counts once per tile)
z16: 153,807 feature pieces read back (a building cut by a tile edge counts once per tile)

=== buildings at z14 only: attributes, EXTENT and SIMPLIFICATION ===
                           variant  size_MB  write_s
                     geometry only     2.12     13.8
           subtype + height (used)     2.26     14.9
             all 10 Part 1 columns     7.39     16.9
     subtype + height, EXTENT=1024     1.79     15.5
subtype + height, SIMPLIFICATION=4     1.90     15.1

=== final tilesets for the web map ===
             file  features zooms  tiles  size_MB  write_s
      hex.pmtiles       758 10-13     25     0.10      0.3
    water.pmtiles       161 10-14     67     0.07      0.1
buildings.pmtiles    144965 14-14     55     2.26     13.8
   places.pmtiles     20727 14-14     55     0.58      2.0
total: 3.01 MB in 202 tiles (the four GeoParquet inputs are 20.8 MB)
buildings.pmtiles metadata: {'name': 'Bristol buildings', 'minzoom': '14', 'maxzoom': '14', 'bounds': '-2.6606280,51.4194968,-2.5192092,51.5004229', 'format': 'pbf'}

=== MapLibre GL JS page ===
output/web/: 9 files, 4.19 MB
  buildings.pmtiles              2261.1 KB
  hex.pmtiles                      96.6 KB
  index.html                       25.9 KB
  lib/LICENSE-maplibre-gl.txt       6.0 KB
  lib/maplibre-gl.css              70.0 KB
  lib/maplibre-gl.js             1056.8 KB
  lib/pmtiles.js                   20.2 KB
  places.pmtiles                  584.1 KB
  water.pmtiles                    65.6 KB
serve it with:  python serve.py   then open http://localhost:8000/

=== figures ===
wrote 01-zoom-size-tradeoff.png, 02-z14-tile-sizes.png, 03-attributes-precision.png, 04-map-overview-hexagons.png, 05-map-buildings-places.png, 06-map-popup-detail.png

=== Playwright: what the browser fetches ===
04-map-overview-hexagons.png: zoom 12.4, 16 range requests to .pmtiles, 104 KB fetched; rendered features {"hex":743,"buildings":0,"places":0}
05-map-buildings-places.png: zoom 15.6, 10 range requests to .pmtiles, 353 KB fetched; rendered features {"hex":0,"buildings":1180,"places":1624}
06-map-popup-detail.png: zoom 17.6, 7 range requests to .pmtiles, 199 KB fetched; rendered features {"hex":0,"buildings":68,"places":207}, clicked "Bershka"