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feat(showcase): stream packed taxi rows into Spatial Atlas #2924

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feat(showcase): stream packed taxi rows into Spatial Atlas #2924

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928b527
feat(showcase): stream packed taxi rows into Spatial Atlas
ibgreen Aug 4, 2026
dcc14d0
fix(showcase): publish cached taxi readiness
ibgreen Aug 4, 2026
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99 changes: 43 additions & 56 deletions examples/deck/luspatial-taxi/taxi-data.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -3,27 +3,47 @@
// SPDX-FileCopyrightText: Copyright (c) vis.gl contributors

import {
PAUL_TAYLOR_POINT_COUNT,
makeSyntheticTaxiPositions,
makeTaxiZones
makeTaxiZones,
PAUL_TAYLOR_POINT_COUNT
} from '../../showcase/billion-point-spatial-atlas/spatial-atlas-data';
import {
assertLongitudeLatitudeTaxiResidentWindow,
getSpatialAtlasTaxiSourceRow
} from '../../showcase/billion-point-spatial-atlas/taxi-atlas-data';
import {
getTaxiLongitudeLatitude,
projectTaxiLongitudeLatitude,
TAXI_LOCAL_LATITUDE_SCALE,
TAXI_LOCAL_LONGITUDE_SCALE,
TAXI_PROJECTION_ORIGIN
} from '../../showcase/billion-point-spatial-atlas/taxi-coordinate-space';
import type {TaxiPointResidentWindow} from '../../showcase/billion-point-spatial-atlas/taxi-resident-window';
import type {
TaxiPointSourceMetadata,
TaxiPointSourceTelemetry
} from '../../showcase/billion-point-spatial-atlas/taxi-source';
import type {TaxiPointSourceTelemetry} from '../../showcase/billion-point-spatial-atlas/taxi-source';

export const TAXI_POINT_COUNT = 1_000_000;
export const TAXI_CORPUS_POINT_COUNT = PAUL_TAYLOR_POINT_COUNT;
export const TAXI_PROJECTION_ORIGIN = [-73.97, 40.75] as const;
export const TAXI_GRID_SIZE = [256, 256] as const;

const TAXI_GENERATION_CHUNK_SIZE = 20_000;
const TAXI_SOURCE_BOUNDS_PADDING = 0.002;
const LOCAL_LONGITUDE_SCALE = 8;
const LOCAL_LATITUDE_SCALE = 9;
const KILOMETRES_PER_DEGREE = 40_000 / 360;
const DEGREES_TO_RADIANS = Math.PI / 180;

export {
assertLongitudeLatitudeTaxiResidentWindow,
getSpatialAtlasTaxiSourceRow,
makeSpatialAtlasTaxiDataFromResidentWindow,
makeSyntheticSpatialAtlasTaxiData,
type SpatialAtlasTaxiData
} from '../../showcase/billion-point-spatial-atlas/taxi-atlas-data';
export {
assertLongitudeLatitudeTaxiMetadata,
getTaxiLocalXY,
getTaxiLongitudeLatitude,
projectTaxiLongitudeLatitude,
TAXI_LOCAL_LATITUDE_SCALE,
TAXI_LOCAL_LONGITUDE_SCALE,
TAXI_PROJECTION_ORIGIN
} from '../../showcase/billion-point-spatial-atlas/taxi-coordinate-space';

export type LuSpatialTaxiData = {
pointCount: number;
Expand Down Expand Up @@ -104,9 +124,9 @@ function appendTaxiPositionChunk(
const localOffset = localPointIndex * 3;
const longitudeLatitudeOffset = (firstPointIndex + localPointIndex) * 2;
const longitude =
localPositions[localOffset] / LOCAL_LONGITUDE_SCALE + TAXI_PROJECTION_ORIGIN[0];
localPositions[localOffset] / TAXI_LOCAL_LONGITUDE_SCALE + TAXI_PROJECTION_ORIGIN[0];
const latitude =
localPositions[localOffset + 1] / LOCAL_LATITUDE_SCALE + TAXI_PROJECTION_ORIGIN[1];
localPositions[localOffset + 1] / TAXI_LOCAL_LATITUDE_SCALE + TAXI_PROJECTION_ORIGIN[1];
longitudeLatitudes[longitudeLatitudeOffset] = longitude;
longitudeLatitudes[longitudeLatitudeOffset + 1] = latitude;
sourceBounds[0] = Math.min(sourceBounds[0], longitude);
Expand Down Expand Up @@ -200,13 +220,7 @@ function yieldTaxiGeneration(signal?: AbortSignal): Promise<void> {
export function makeLuSpatialTaxiDataFromResidentWindow(
window: TaxiPointResidentWindow
): LuSpatialTaxiData {
assertLongitudeLatitudeTaxiMetadata(window.metadata);
if (window.positions.length !== window.rowCount * 2) {
throw new Error('Taxi resident window positions must contain two values per row');
}
if (window.sourceRowIndices.length !== window.rowCount) {
throw new Error('Taxi resident window sourceRowIndices must align with positions');
}
assertLongitudeLatitudeTaxiResidentWindow(window);

const sourceBounds = [Infinity, Infinity, -Infinity, -Infinity];
const projectedBounds = [Infinity, Infinity, -Infinity, -Infinity];
Expand Down Expand Up @@ -254,47 +268,18 @@ export function makeLuSpatialTaxiDataFromResidentWindow(
};
}

/** Rejects source-XY data until its manifest explicitly declares WGS84 longitude/latitude. */
export function assertLongitudeLatitudeTaxiMetadata(metadata: TaxiPointSourceMetadata): void {
const coordinateReferenceSystem = metadata.coordinateSpace.crs?.trim().toUpperCase();
if (
coordinateReferenceSystem !== 'OGC:CRS84' &&
coordinateReferenceSystem !== 'CRS84' &&
coordinateReferenceSystem !== 'EPSG:4326' &&
coordinateReferenceSystem !== 'WGS84'
) {
throw new Error(
'luSpatial taxi sources must explicitly declare OGC:CRS84 or WGS84/EPSG:4326 longitude/latitude coordinates'
);
}
}

/** CPU projection provider and tiny query-input companion for the adaptive luProj GPU plan. */
export function projectTaxiLongitudeLatitude(
longitudeLatitude: readonly [number, number]
): readonly [number, number] {
const [longitude, latitude] = longitudeLatitude;
const midpointLatitudeRadians = (latitude + TAXI_PROJECTION_ORIGIN[1]) * 0.5 * DEGREES_TO_RADIANS;
return [
(TAXI_PROJECTION_ORIGIN[0] - longitude) *
KILOMETRES_PER_DEGREE *
Math.cos(midpointLatitudeRadians),
(TAXI_PROJECTION_ORIGIN[1] - latitude) * KILOMETRES_PER_DEGREE
];
}

/** Taxi-zone centers used as navigation and radius-query presets. */
export function makeTaxiZonePresets(): readonly TaxiZonePreset[] {
return makeTaxiZones().map(zone => {
const localWidth = zone.bounds[2] - zone.bounds[0];
const localHeight = zone.bounds[3] - zone.bounds[1];
const longitude =
((zone.bounds[0] + zone.bounds[2]) * 0.5) / LOCAL_LONGITUDE_SCALE + TAXI_PROJECTION_ORIGIN[0];
const latitude =
((zone.bounds[1] + zone.bounds[3]) * 0.5) / LOCAL_LATITUDE_SCALE + TAXI_PROJECTION_ORIGIN[1];
const [longitude, latitude] = getTaxiLongitudeLatitude([
(zone.bounds[0] + zone.bounds[2]) * 0.5,
(zone.bounds[1] + zone.bounds[3]) * 0.5
]);
const maximumExtent = Math.max(
localWidth / LOCAL_LONGITUDE_SCALE,
localHeight / LOCAL_LATITUDE_SCALE
localWidth / TAXI_LOCAL_LONGITUDE_SCALE,
localHeight / TAXI_LOCAL_LATITUDE_SCALE
);
return {
id: zone.id,
Expand All @@ -318,10 +303,12 @@ export function getTaxiPoint(
if (!Number.isSafeInteger(pointIndex) || pointIndex < 0 || pointIndex >= data.pointCount) {
return null;
}
const sourceRowIndex = getSpatialAtlasTaxiSourceRow(data, pointIndex);
if (sourceRowIndex === null) return null;
return {
longitude: data.longitudeLatitudes[pointIndex * 2],
latitude: data.longitudeLatitudes[pointIndex * 2 + 1],
sourceRowIndex: data.sourceRowIndices?.[pointIndex] ?? pointIndex,
sourceRowIndex,
sourceKind: data.sourceKind
};
}
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