fix(planetary): correct measurements, buffers, and circles off Earth - #1993
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GeoLibre knows which celestial body a project is on, but most of what it measures still went through Turf.js and the Measure control, both of which bake in Earth's radius. On Mars every distance read ~1.88x too large and every area ~3.5x too large, so the planetary basemaps added in #1133 could be flown but not measured. Turf hardcodes Earth's radius with no per-call override, so rather than patch or replace it, apply the radius ratio @thareUSGS (USGS Astrogeology) suggested on the issue: scale what Turf returns, and pre-scale what Turf is given. Exact for a sphere, which is how every non-Earth body here is modelled. Adds to @geolibre/core: getActiveBodyRadiusRatio, earthLengthToBody, bodyLengthToEarth, and earthAreaToBody, all no-ops on Earth. Corrected surfaces: - The Measure control's distance/area, via the new maplibre-gl-components 0.31.0 `radius` option. It follows the planet switcher live, recomputing the measurements already on screen. - Turf buffers (Processing and the symbology geometry generator), the cell-site coverage circles/sectors, and the GPS track speed, stop, and co-location distances. - The nearest-neighbour study area, which mixed a body-aware mean distance with an Earth-based area. - The print layout and atlas scale distances, so an exported layout's scale bar matches the on-map one, and the elevation profile's distance axis. The Measure panel now also names the body it measured on, so a planetary user can tell a corrected reading from an Earth one. Fixes #1128
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Included review availability: Your plan provides up to 8 included reviews per hour; 2 remain after this review. 📝 WalkthroughWalkthroughGeoLibre adds active-ellipsoid radius conversions across geometry, processing, printing, and measurements. Terrain measurements now update after ellipsoid changes and display localized body names. Tests cover length, area, buffer, cache, and Mars scaling behavior. ChangesActive ellipsoid support
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: ⚪ Minimal · up to The PR corrects planetary measurement and geometry scaling while preserving Earth behavior; no actionable merge-blocking risk remains. Sequence Diagram(s)sequenceDiagram
participant DesktopShell
participant TerrainMeasure
participant ActiveEllipsoid
participant MeasurementPanel
DesktopShell->>TerrainMeasure: register localized body names and note
ActiveEllipsoid->>TerrainMeasure: notify body-radius change
TerrainMeasure->>TerrainMeasure: recompute measurement
TerrainMeasure->>MeasurementPanel: render body-aware values and note
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In `@apps/geolibre-desktop/src/i18n/locales/ka.json`:
- Line 190: Update the bodyNote translation to avoid concatenating the `-ზე`
suffix directly to `{{body}}`; use a grammatically neutral phrasing or an
inflected-body-label approach so replacements produce correct Georgian forms
such as `მარსზე`.
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apps/geolibre-desktop/package.jsonapps/geolibre-desktop/src/components/layout/DesktopShell.tsxapps/geolibre-desktop/src/components/panels/LayerPanel.tsxapps/geolibre-desktop/src/i18n/locales/ar.jsonapps/geolibre-desktop/src/i18n/locales/de.jsonapps/geolibre-desktop/src/i18n/locales/en.jsonapps/geolibre-desktop/src/i18n/locales/es.jsonapps/geolibre-desktop/src/i18n/locales/fa.jsonapps/geolibre-desktop/src/i18n/locales/fr.jsonapps/geolibre-desktop/src/i18n/locales/hi.jsonapps/geolibre-desktop/src/i18n/locales/id.jsonapps/geolibre-desktop/src/i18n/locales/it.jsonapps/geolibre-desktop/src/i18n/locales/ja.jsonapps/geolibre-desktop/src/i18n/locales/ka.jsonapps/geolibre-desktop/src/i18n/locales/ko.jsonapps/geolibre-desktop/src/i18n/locales/nl.jsonapps/geolibre-desktop/src/i18n/locales/pt.jsonapps/geolibre-desktop/src/i18n/locales/ru.jsonapps/geolibre-desktop/src/i18n/locales/th.jsonapps/geolibre-desktop/src/i18n/locales/tr.jsonapps/geolibre-desktop/src/i18n/locales/vi.jsonapps/geolibre-desktop/src/i18n/locales/zh.jsonapps/geolibre-desktop/src/lib/planet-labels.tsapps/geolibre-desktop/src/lib/print-atlas.tsapps/geolibre-desktop/src/lib/print-layout-export.tspackages/core/src/camera-altitude.tspackages/core/src/ellipsoids.tspackages/map/src/derived-geometry.tspackages/plugins/package.jsonpackages/plugins/src/index.tspackages/plugins/src/plugins/elevation-profile/elevation/geometry.tspackages/plugins/src/plugins/maplibre-components.tspackages/plugins/src/plugins/terrain-measure.tspackages/processing/src/statistics-tools.tspackages/processing/src/vector-tools.tstests/derived-geometry.test.tstests/planetary-geodesy.test.ts
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Code reviewI reviewed the full diff: the new radius-ratio conversion helpers in Bugs
Security
Performance
Quality
CLAUDE.md
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- Make the Measure panel's body note grammatically safe in every locale. The
body name is now a standalone token after a colon instead of the object of a
preposition: no single inline form can be right for every body in every
language. CodeRabbit caught Georgian producing "მარსი-ზე" instead of
"მარსზე", and the same construction was wrong for German ("auf dem Mars"),
French ("sur la Lune"), and Russian ("на Марсе"), which inflect or take an
article. Updated all 19 catalogs and the English default.
- Use the new getActiveBodyRadiusRatio() in scaleAltitudeToActiveBody rather
than recomputing the same ratio inline, so the two call sites cannot drift.
Code reviewBugs: None found. Traced the radius-ratio correction end-to-end ( Security: No injection, unsafe input handling, or secrets in the diff — all changes are internal math/UI plumbing. Confidence: high. Performance: No meaningful regressions; the per-call ellipsoid lookups are over a fixed 12-entry array and the new store subscription does a cheap id-equality guard, matching the codebase's existing mirroring-subscription pattern in Quality:
CLAUDE.md: The |
Rename the geodesy helpers' parameters from meters/squareMeters to length/area and say in the docs that the ratio is dimensionless, so a future reader is not misled into thinking a call site passing kilometres or miles is broken. Several call sites legitimately pass whatever unit the user picked; the conversion is correct for any linear unit as long as the same one is used on both sides.
Code reviewBugs: None found. I traced every conversion site (Measure tool via the new Security: None found — no new I/O, external input parsing, or injection surface; this is pure client-side geometry math and translation strings. Performance: Low/medium confidence — Quality: Good — the new CLAUDE.md: No violations — |
Hoist the body radius conversion out of the movement tools' hot loops. Stop detection and space-time proximity now convert their distance threshold into turf's Earth-based units once, before the scan, and compare the raw turf distance against it, so neither O(n²) loop does a per-iteration ellipsoid lookup. Space-time proximity converts only the pairs that survive the test, since the reported `distance` property still has to be the body's ground distance. Trajectory speed reads the ratio once per run rather than per segment. Behaviour is unchanged: `earthLengthToBody(d) <= max` and `d <= bodyLengthToEarth(max)` are the same comparison. Added tests pinning that the threshold and the derived speed are still the body's ground distance, not Earth's.
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All good. I've thoroughly reviewed the core geodesy logic, all touched call sites (buffer, cell sectors, trajectory speed, stop detection, space-time proximity, average-nearest-neighbor, derived-geometry buffer generator, print/atlas/elevation-profile haversine, camera altitude, Measure control radius wiring, and the i18n additions). No correctness bugs found — the unit conversions are consistently applied and the direction of each Code reviewBugs: None found. Traced every new call site of the four geodesy helpers ( Security: No new user input handling, network calls, or injection surfaces introduced. (Confidence: high) Performance: The O(n²) scans in Quality: Clean, well-documented change with good separation: the conversion helpers live in one place ( CLAUDE.md: The |
Fixes #1128.
GeoLibre has known which celestial body a project is on since #1133, and the scale bar, camera altitude, Field Calculator, and spatial-stats haversine already read that body's radius. But the two things a planetary user reaches for first, the Measure tool and Turf.js, still assumed Earth: on Mars every distance read about 1.88x too large and every area about 3.5x too large. The planetary basemaps could be flown but not measured.
This implements the workaround @thareUSGS (USGS Astrogeology) proposed in #1128 (comment). Turf hardcodes Earth's radius with no per-call override, so rather than patch or replace Turf, GeoLibre scales what Turf returns and pre-scales what Turf is given. The correction is exact for a sphere, which is how every non-Earth body in
ellipsoids.tsis modelled, and is within Mars' 0.6% flattening at worst.What changed
@geolibre/coregains four helpers, all exact no-ops on Earth:getActiveBodyRadiusRatio(),earthLengthToBody()(for anything Turf returns),bodyLengthToEarth()(for any distance handed to Turf), andearthAreaToBody()(which scales by the ratio squared, not the ratio).Corrected surfaces:
radiusoption in maplibre-gl-components (feat(measure): add a body radius option so measurements work off Earth maplibre-gl-components#130, released as 0.31.0). It follows the planet switcher live: changing bodies recomputes the measurements already on screen rather than leaving a mix of two bodies.The Measure panel also carries a short note naming the body it measured on ("Measured on Mars (spherical approximation)"), hidden on Earth. @thareUSGS floated this in the same comment, and without it there is no way to tell a corrected reading from an Earth one. It is translated into all 19 locales and reuses the planet switcher's names, so the two always agree.
Out of scope
The sidecar's
/vectorbuffer path (GeoPandas viaestimate_utm_crs) stays Earth-only, since UTM zones do not exist off Earth. That path is opt-in and Vector tools fall back to the client engine, which this PR corrects. Earth-specific DGGS grids (H3, S2, A5, DGGRID) keep their Earth constants by definition.Verification
Driven in the real app with Playwright, in both light and dark themes, against the published maplibre-gl-components 0.31.0.
Measuring the same span across the globe:
Switching Earth to Mars to Moon and back to Earth with a measurement on screen recomputes to 3065.81, 1631.08, 836.06, 3065.81, so the round trip is exact. Area on the same polygon went 2,456,287 km2 on Earth to 695,250 km2 on Mars, matching the ratio squared rather than the ratio.
Full frontend suite passes (6333 tests) and the coverage gate is green. New tests:
tests/planetary-geodesy.test.tspins the three conversions, the Earth no-op invariant, and every built-in body;tests/derived-geometry.test.tsgains a Mars buffer case that also exercises the new cache key. Upstream,MeasureControlgained 6 tests covering radius scaling, recomputation, theradiuschangeevent, and invalid-radius handling.Summary by CodeRabbit