rega measured ~3.6 MB of boundary GeoJSON costing 5-6 s of MapLibre worker
parsing before the first territory draws, on every partner page. These copies
are for interactive maps; the full files stay for posters, print and
build-time point-in-polygon.
world-adm0-web.geojson 1,866 KB -> 383 KB (gzip 596 -> 134) 162 features, 572/572 parts
gb-IND-ADM1-full-web.geojson 1,796 KB -> 227 KB (gzip 451 -> 69) 36 features, 452/452 parts
gb-IND-ADM1-web.geojson 1,628 KB -> 178 KB (gzip 412 -> 55) 34 features, 40/40 parts, listId kept
(gb-CHN-ADM1 is 56 KB already: no copy)
library/scripts/boundaries/build-web-boundaries.mjs writes them with mapshaper
(pinned 0.6.121, via npx; not a repo dependency): -explode, then topology-
preserving Visvalingam with keep-shapes, then -dissolve with every other
property copied. The explode makes each island its own shape, so keep-shapes
protects every one: without it, the world drops from 572 to 240 parts. The run
FAILS on a changed feature count, a lost key, a changed property or a dropped
part. Negative-tested (without -explode: 297/572 parts -> FAIL), and a second run
writes identical bytes.
Measured (_qa-cycle/03-deployment-cycle/REPORT-WEB-BOUNDARIES.md): median area
error 0.57% (world), 0.04% (India). Of 14,486 real people-group points, 95.9%
stay in the same country in the world file and 99.9% in the India file; the
misses are archipelago coasts. No runtime code does point-in-polygon on these
files, so this is visual only.
Not wired: consumers still fetch the full files, and generate-tree does not
stage the -web copies yet. Both are in the report's switch table.
The served gb-IND-ADM1.geojson is the 100-list's curated partition (Mizoram and Nagaland excluded,
listId-tagged), so a map colouring every state had data for 36 and shapes for 34. data/boundaries/
gb-IND-ADM1-full.geojson is all 36 from geoBoundaries gbOpen (boundaryID IND-ADM1-1811400, DataMeet /
Election Commission of India, CC BY 2.5 IN), with source and licence in gb-IND-ADM1-full.meta.json;
generate-tree stages both, and the dev server serves data/ directly. Reproducible with
library/scripts/boundaries/source-full-adm1.mjs (coordinates rounded to 3 decimals: 1.84 MB). The curated
file is untouched.
