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Evan Rusackas ae5e1132ba feat(country-map): build script — mapshaper -simplify final pass

Add mapshaper -simplify as a final-stage pass after the Python
transforms. Two-stage so the transforms operate on full-resolution
geometry (no risk of repositioning ghost features that got simplified
away) but the shipped output is browser-sized.

Default 5% with keep-shapes — preserves recognizable country shapes
while dropping the per-vertex bloat. keep-shapes prevents tiny features
(small island chains) from being collapsed away entirely.

Results on real outputs:
  Admin 0: 23.6 MB → 2.1 MB  (-91%, 249 features intact)
  Admin 1: 67.7 MB → 15 MB   (-78%, 4591 features, transforms preserved)

Per-feature simplify factors (the notebook had a size-based ladder)
can be added later if specific countries need tuning. 5% is the
mapshaper-recommended "good enough for web" default.

Open thought for future: split Admin 1 output by country
(`<worldview>_admin1_<adm0_a3>.geo.json`) so the per-chart payload is
~50KB-1MB instead of one 15MB global file. Will pair naturally with
the territory_assignments pass (which is per-country anyway).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

2026-05-12 16:03:34 -07:00

config

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procedural

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.gitignore

feat(country-map): minimum-viable build pipeline (NE → GeoJSON)

2026-05-12 16:00:29 -07:00

build.py

feat(country-map): build script — mapshaper -simplify final pass

2026-05-12 16:03:34 -07:00

build.sh

feat(country-map): minimum-viable build pipeline (NE → GeoJSON)

2026-05-12 16:00:29 -07:00

README.md

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README.md

Country Map data pipeline

This directory contains the build pipeline that turns upstream Natural Earth data into the GeoJSON files consumed by @superset-ui/plugin-chart-country-map.

It replaces the legacy scripts/Country Map GeoJSON Generator.ipynb notebook. See SIP_DRAFT.md in the parent directory for the full design rationale.

Layout

scripts/
  build.sh                   # one-shot reproducible build
  README.md                  # this file
  config/                    # declarative YAML — handles ~95% of fixes
    name_overrides.yaml      # typos, deprecated ISO codes, admin renames
    flying_islands.yaml      # repositioning + bbox drops for far-flung territories
    territory_assignments.yaml   # add features from sibling Admin 0 records
    regional_aggregations.yaml   # dissolve Admin 1 into administrative regions
    composite_maps.yaml      # multi-country composites (e.g. France-with-Overseas)
  procedural/                # escape hatch — handles the rare 5%
    README.md                # when to use, when not
    NN_<descriptive_name>.py # one focused script per genuine edge case
  output/                    # gitignored — build artifacts

Operating principles

Default tool: declarative YAML. Most touchups are renames, repositions, dissolves, or filters — all expressible in YAML. Diffs are small, conflicts localize cleanly to one entry, contributors can submit "fix typo X" as a one-line PR.
Escape hatch: procedural/ directory of small, named, single-purpose Python scripts for the rare cases YAML can't express cleanly. Each script has a header comment explaining why it's not in YAML. See procedural/README.md for the bar.
Build is reproducible from a pinned NE version. build.sh records the NE git SHA it consumed; outputs are deterministic given inputs.
CI regenerates on schema change and opens a PR if outputs differ. Maintainers review the cartographic diff in legible GeoJSON, not opaque notebook JSON.

Workflow for adding a fix

Identify the upstream NE issue (wrong name, missing territory, etc.).
Try YAML first. Add the smallest possible entry to the appropriate config file with a description field explaining the fix.
If YAML can't express it cleanly, add a numbered script in procedural/ with a header comment explaining why YAML didn't fit.
Run build.sh locally, verify the output GeoJSON looks right.
Open PR. Reviewer sees the YAML diff (or new procedural script) plus the regenerated GeoJSON.

README.md

Country Map data pipeline

Layout

Operating principles

Workflow for adding a fix

See also