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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>GCP Accelerator Map</title>
    <script src="https://cesium.com/downloads/cesiumjs/releases/1.117/Build/Cesium/Cesium.js"></script>
    <link href="https://cesium.com/downloads/cesiumjs/releases/1.117/Build/Cesium/Widgets/widgets.css" rel="stylesheet">
    <style>
        html, body, #cesiumContainer {
            width: 100%;
            height: 100%;
            margin: 0;
            padding: 0;
            overflow: hidden;
            font-family: sans-serif;
        }
        #controls {
            position: absolute;
            top: 10px;
            left: 10px;
            background: rgba(40, 40, 40, 0.8);
            padding: 15px;
            border-radius: 8px;
            color: white;
            max-height: 90vh;
            overflow-y: auto;
            z-index: 10;
        }
        #controls h3 {
            margin-top: 0;
        }
        #controls label {
            display: block;
            margin-bottom: 8px;
            cursor: pointer;
        }
        #controls input[type="checkbox"] {
            margin-right: 8px;
        }
    </style>
</head>
<body>
    <div id="cesiumContainer"></div>
    <div id="controls">
        <h3>Filter by Accelerator</h3>
        <div id="acceleratorFilters">
            </div>
    </div>

    <script>
        // --- Cesium Ion Access Token (Replace with your own) ---
        Cesium.Ion.defaultAccessToken = 'YOUR_CESIUM_ION_ACCESS_TOKEN'; // Optional

        // --- Datacenter Data ---
        // (Latitude and Longitude are approximate and need to be verified/corrected)
        const rawData = [
            { accelerator: "TPU v2", regionId: "us-central1", zones: "b, c, f", location: "Council Bluffs, Iowa, USA", lat: 41.2619, lon: -95.8514 },
            { accelerator: "TPU v2", regionId: "europe-west4", zones: "a", location: "Eemshaven, Netherlands", lat: 53.4427, lon: 6.8442 },
            { accelerator: "TPU v2", regionId: "asia-east1", zones: "c", location: "Changhua County, Taiwan", lat: 24.0716, lon: 120.5469 },
            // ... (Duplicate TPU v2 entries were present, consolidated by location for mapping)
            { accelerator: "TPU v3", regionId: "us-central1", zones: "a, b, f", location: "Council Bluffs, Iowa, USA", lat: 41.2619, lon: -95.8514 },
            { accelerator: "TPU v3", regionId: "europe-west4", zones: "a", location: "Eemshaven, Netherlands", lat: 53.4427, lon: 6.8442 },
            // ... (Duplicate TPU v3 entries)
            { accelerator: "TPU v4", regionId: "us-central2", zones: "b", location: "Council Bluffs, Iowa, USA (?)", lat: 41.2619, lon: -95.8514 }, // Note: Location was marked with (?)
            { accelerator: "TPU v5e", regionId: "us-central1", zones: "a", location: "Council Bluffs, Iowa, USA", lat: 41.2619, lon: -95.8514 },
            { accelerator: "TPU v5e", regionId: "us-east5", zones: "a, b, c", location: "Columbus, Ohio, USA", lat: 39.9612, lon: -82.9988 },
            { accelerator: "TPU v5e", regionId: "us-south1", zones: "a", location: "Dallas, Texas, USA", lat: 32.7767, lon: -96.7970 },
            { accelerator: "TPU v5e", regionId: "us-west1", zones: "c", location: "The Dalles, Oregon, USA", lat: 45.5946, lon: -121.1787 },
            { accelerator: "TPU v5e", regionId: "us-west4", zones: "a", location: "Las Vegas, Nevada, USA", lat: 36.1699, lon: -115.1398 },
            { accelerator: "TPU v5e", regionId: "europe-west1", zones: "b", location: "St. Ghislain, Belgium", lat: 50.4377, lon: 3.8203 },
            { accelerator: "TPU v5e", regionId: "asia-southeast1", zones: "b", location: "Jurong West, Singapore", lat: 1.3521, lon: 103.8198 }, // Using general Singapore coords
            { accelerator: "TPU v5p", regionId: "us-east5", zones: "a", location: "Columbus, Ohio, USA", lat: 39.9612, lon: -82.9988 },
            { accelerator: "TPU v5p", regionId: "europe-west4", zones: "b", location: "Eemshaven, Netherlands", lat: 53.4427, lon: 6.8442 },
            { accelerator: "TPU v6e", regionId: "us-east1", zones: "d", location: "Moncks Corner, South Carolina, USA", lat: 33.1957, lon: -79.9906 },
            { accelerator: "TPU v6e", regionId: "us-east5", zones: "b", location: "Columbus, Ohio, USA", lat: 39.9612, lon: -82.9988 },
            { accelerator: "TPU v6e", regionId: "europe-west4", zones: "a", location: "Eemshaven, Netherlands", lat: 53.4427, lon: 6.8442 },
            { accelerator: "TPU v6e", regionId: "asia-northeast1", zones: "b", location: "Tokyo, Japan", lat: 35.6895, lon: 139.6917 },
            { accelerator: "H100 A3 Mega", regionId: "us-central1", zones: "a, b*, c", location: "Council Bluffs, Iowa, USA", lat: 41.2619, lon: -95.8514, notes: "b: Limited capacity, contact TAM" },
            { accelerator: "H100 A3 Mega", regionId: "us-east4", zones: "a, b, c", location: "Ashburn, Virginia, USA", lat: 39.0438, lon: -77.4874 },
            { accelerator: "H100 A3 Mega", regionId: "us-west1", zones: "a, b", location: "The Dalles, Oregon, USA", lat: 45.5946, lon: -121.1787 },
            { accelerator: "H100 A3 Mega", regionId: "us-west4", zones: "a", location: "Las Vegas, Nevada, USA", lat: 36.1699, lon: -115.1398 },
            { accelerator: "H100 A3 Mega", regionId: "asia-northeast1", zones: "b", location: "Tokyo, Japan", lat: 35.6895, lon: 139.6917 },
            { accelerator: "H100 A3 Mega", regionId: "asia-southeast1", zones: "b, c", location: "Jurong West, Singapore", lat: 1.3521, lon: 103.8198 },
            { accelerator: "H100 A3 Mega", regionId: "australia-southeast1", zones: "c*", location: "Sydney, Australia", lat: -33.8688, lon: 151.2093, notes: "Limited capacity, contact TAM" },
            { accelerator: "H100 A3 Mega", regionId: "europe-west1", zones: "b*, c*", location: "St. Ghislain, Belgium", lat: 50.4377, lon: 3.8203, notes: "Limited capacity, contact TAM" },
            { accelerator: "H100 A3 Mega", regionId: "europe-west4", zones: "b, c", location: "Eemshaven, Netherlands", lat: 53.4427, lon: 6.8442 },
            { accelerator: "H100 A3 High", regionId: "us-central1", zones: "a, c", location: "Council Bluffs, Iowa, USA", lat: 41.2619, lon: -95.8514 },
            { accelerator: "H100 A3 High", regionId: "us-east4", zones: "a, b", location: "Ashburn, Virginia, USA", lat: 39.0438, lon: -77.4874 },
            { accelerator: "H100 A3 High", regionId: "us-east5", zones: "a", location: "Columbus, Ohio, USA", lat: 39.9612, lon: -82.9988 },
            { accelerator: "H100 A3 High", regionId: "us-west1", zones: "a, b", location: "The Dalles, Oregon, USA", lat: 45.5946, lon: -121.1787 },
            { accelerator: "H100 A3 High", regionId: "us-west4", zones: "a", location: "Las Vegas, Nevada, USA", lat: 36.1699, lon: -115.1398 },
            { accelerator: "H100 A3 High", regionId: "asia-northeast1", zones: "b", location: "Tokyo, Japan", lat: 35.6895, lon: 139.6917 },
            { accelerator: "H100 A3 High", regionId: "asia-southeast1", zones: "b, c", location: "Jurong West, Singapore", lat: 1.3521, lon: 103.8198 },
            { accelerator: "H100 A3 High", regionId: "europe-west1", zones: "b*", location: "St. Ghislain, Belgium", lat: 50.4377, lon: 3.8203, notes: "Limited capacity, contact TAM" },
            { accelerator: "H100 A3 Edge", regionId: "northamerica-northeast2", zones: "c", location: "Toronto, Ontario, Canada", lat: 43.6532, lon: -79.3832 },
            { accelerator: "H100 A3 Edge", regionId: "asia-northeast1", zones: "b", location: "Tokyo, Japan", lat: 35.6895, lon: 139.6917 },
            { accelerator: "H100 A3 Edge", regionId: "asia-northeast3", zones: "a, c", location: "Seoul, South Korea", lat: 37.5665, lon: 126.9780 },
            { accelerator: "H100 A3 Edge", regionId: "asia-south1", zones: "c", location: "Mumbai, India", lat: 19.0760, lon: 72.8777 },
            { accelerator: "H100 A3 Edge", regionId: "europe-west2", zones: "b", location: "London, UK", lat: 51.5074, lon: -0.1278 },
            { accelerator: "H100 A3 Edge", regionId: "europe-west3", zones: "a", location: "Frankfurt, Germany", lat: 50.1109, lon: 8.6821 },
            { accelerator: "A100 A2 Ultra", regionId: "us-central1", zones: "a, c", location: "Council Bluffs, Iowa, USA", lat: 41.2619, lon: -95.8514 },
            { accelerator: "A100 A2 Ultra", regionId: "us-east4", zones: "c", location: "Ashburn, Virginia, USA", lat: 39.0438, lon: -77.4874 },
            { accelerator: "A100 A2 Ultra", regionId: "us-east5", zones: "b", location: "Columbus, Ohio, USA", lat: 39.9612, lon: -82.9988 },
            { accelerator: "A100 A2 Ultra", regionId: "asia-southeast1", zones: "c", location: "Jurong West, Singapore", lat: 1.3521, lon: 103.8198 },
            { accelerator: "A100 A2 Ultra", regionId: "europe-west4", zones: "a, b, c", location: "Eemshaven, Netherlands", lat: 53.4427, lon: 6.8442 },
            { accelerator: "A100 40GB A2 Standard", regionId: "us-central1", zones: "a*, b*, c*, f*", location: "Council Bluffs, Iowa, USA", lat: 41.2619, lon: -95.8514, notes: "a2-megagpu-16g only" },
            { accelerator: "A100 40GB A2 Standard", regionId: "us-east1", zones: "b", location: "Moncks Corner, South Carolina, USA", lat: 33.1957, lon: -79.9906 },
            { accelerator: "A100 40GB A2 Standard", regionId: "us-west1", zones: "b", location: "The Dalles, Oregon, USA", lat: 45.5946, lon: -121.1787 },
            { accelerator: "A100 40GB A2 Standard", regionId: "us-west3", zones: "b", location: "Salt Lake City, Utah, USA", lat: 40.7608, lon: -111.8910 },
            { accelerator: "A100 40GB A2 Standard", regionId: "us-west4", zones: "b", location: "Las Vegas, Nevada, USA", lat: 36.1699, lon: -115.1398 },
            { accelerator: "A100 40GB A2 Standard", regionId: "asia-northeast1", zones: "a, c", location: "Tokyo, Japan", lat: 35.6895, lon: 139.6917 },
            { accelerator: "A100 40GB A2 Standard", regionId: "asia-northeast3", zones: "a, b", location: "Seoul, South Korea", lat: 37.5665, lon: 126.9780 },
            { accelerator: "A100 40GB A2 Standard", regionId: "asia-southeast1", zones: "b, c*", location: "Jurong West, Singapore", lat: 1.3521, lon: 103.8198, notes: "c: a2-megagpu-16g only" },
            { accelerator: "A100 40GB A2 Standard", regionId: "me-west1", zones: "a, c", location: "Tel Aviv, Israel", lat: 32.0853, lon: 34.7818 },
            { accelerator: "A100 40GB A2 Standard", regionId: "europe-west4", zones: "a*, b*", location: "Eemshaven, Netherlands", lat: 53.4427, lon: 6.8442, notes: "a2-megagpu-16g only" },
            { accelerator: "G2 (L4)", regionId: "us-central1", zones: "a, b, c", location: "Council Bluffs, Iowa, USA", lat: 41.2619, lon: -95.8514 },
            { accelerator: "G2 (L4)", regionId: "us-east1", zones: "b, c, d", location: "Moncks Corner, South Carolina, USA", lat: 33.1957, lon: -79.9906 },
            { accelerator: "G2 (L4)", regionId: "us-east4", zones: "a", location: "Ashburn, Virginia, USA", lat: 39.0438, lon: -77.4874 },
            { accelerator: "G2 (L4)", regionId: "us-west1", zones: "a, b, c", location: "The Dalles, Oregon, USA", lat: 45.5946, lon: -121.1787 },
            { accelerator: "G2 (L4)", regionId: "us-west4", zones: "a, c", location: "Las Vegas, Nevada, USA", lat: 36.1699, lon: -115.1398 },
            { accelerator: "G2 (L4)", regionId: "northamerica-northeast2", zones: "a", location: "Toronto, Ontario, Canada", lat: 43.6532, lon: -79.3832 },
            { accelerator: "G2 (L4)", regionId: "asia-east1", zones: "a, b, c", location: "Changhua County, Taiwan", lat: 24.0716, lon: 120.5469 },
            { accelerator: "G2 (L4)", regionId: "asia-northeast1", zones: "a, b, c", location: "Tokyo, Japan", lat: 35.6895, lon: 139.6917 },
            { accelerator: "G2 (L4)", regionId: "asia-northeast3", zones: "a, b", location: "Seoul, South Korea", lat: 37.5665, lon: 126.9780 },
            { accelerator: "G2 (L4)", regionId: "asia-south1", zones: "a, b, c", location: "Mumbai, India", lat: 19.0760, lon: 72.8777 },
            { accelerator: "G2 (L4)", regionId: "asia-southeast1", zones: "a, b, c", location: "Jurong West, Singapore", lat: 1.3521, lon: 103.8198 },
            { accelerator: "G2 (L4)", regionId: "australia-southeast1", zones: "a", location: "Sydney, Australia", lat: -33.8688, lon: 151.2093 },
            { accelerator: "G2 (L4)", regionId: "europe-west1", zones: "b, c", location: "St. Ghislain, Belgium", lat: 50.4377, lon: 3.8203 },
            { accelerator: "G2 (L4)", regionId: "europe-west2", zones: "a, b", location: "London, UK", lat: 51.5074, lon: -0.1278 },
            { accelerator: "G2 (L4)", regionId: "europe-west3", zones: "a, b", location: "Frankfurt, Germany", lat: 50.1109, lon: 8.6821 },
            { accelerator: "G2 (L4)", regionId: "europe-west4", zones: "a, b, c", location: "Eemshaven, Netherlands", lat: 53.4427, lon: 6.8442 },
            { accelerator: "G2 (L4)", regionId: "europe-west6", zones: "b, c", location: "Zurich, Switzerland", lat: 47.3769, lon: 8.5417 },
            { accelerator: "G2 (L4)", regionId: "me-central2", zones: "a", location: "Dammam, Saudi Arabia", lat: 26.4207, lon: 50.0888 },
            { accelerator: "N1+T4", regionId: "us-central1", zones: "a, b, f", location: "Council Bluffs, Iowa, USA", lat: 41.2619, lon: -95.8514 },
            { accelerator: "N1+T4", regionId: "us-east1", zones: "c, d", location: "Moncks Corner, South Carolina, USA", lat: 33.1957, lon: -79.9906 },
            { accelerator: "N1+T4", regionId: "us-east4", zones: "a, b", location: "Ashburn, Virginia, USA", lat: 39.0438, lon: -77.4874 },
            { accelerator: "N1+T4", regionId: "us-west1", zones: "a, b", location: "The Dalles, Oregon, USA", lat: 45.5946, lon: -121.1787 },
            { accelerator: "N1+T4", regionId: "us-west3", zones: "b", location: "Salt Lake City, Utah, USA", lat: 40.7608, lon: -111.8910 },
            { accelerator: "N1+T4", regionId: "us-west4", zones: "a, b", location: "Las Vegas, Nevada, USA", lat: 36.1699, lon: -115.1398 },
            { accelerator: "N1+T4", regionId: "northamerica-northeast1", zones: "c", location: "Montréal, Québec, Canada", lat: 45.5017, lon: -73.5673 },
            { accelerator: "N1+T4", regionId: "asia-east1", zones: "a, c", location: "Changhua County, Taiwan", lat: 24.0716, lon: 120.5469 },
            { accelerator: "N1+T4", regionId: "asia-east2", zones: "a, c", location: "Hong Kong", lat: 22.3193, lon: 114.1694 },
            { accelerator: "N1+T4", regionId: "asia-northeast1", zones: "a, c", location: "Tokyo, Japan", lat: 35.6895, lon: 139.6917 },
            { accelerator: "N1+T4", regionId: "asia-northeast3", zones: "b, c", location: "Seoul, South Korea", lat: 37.5665, lon: 126.9780 },
            { accelerator: "N1+T4", regionId: "asia-south1", zones: "a, b", location: "Mumbai, India", lat: 19.0760, lon: 72.8777 },
            { accelerator: "N1+T4", regionId: "asia-southeast1", zones: "a, b, c", location: "Jurong West, Singapore", lat: 1.3521, lon: 103.8198 },
            { accelerator: "N1+T4", regionId: "asia-southeast2", zones: "a", location: "Jakarta, Indonesia", lat: -6.2088, lon: 106.8456 },
            { accelerator: "N1+T4", regionId: "australia-southeast1", zones: "a, c", location: "Sydney, Australia", lat: -33.8688, lon: 151.2093 },
            { accelerator: "N1+T4", regionId: "europe-central2", zones: "b, c", location: "Warsaw, Poland", lat: 52.2297, lon: 21.0122 },
            { accelerator: "N1+T4", regionId: "europe-west1", zones: "b, c, d", location: "St. Ghislain, Belgium", lat: 50.4377, lon: 3.8203 },
            { accelerator: "N1+T4", regionId: "europe-west2", zones: "a, b", location: "London, UK", lat: 51.5074, lon: -0.1278 },
            { accelerator: "N1+T4", regionId: "europe-west3", zones: "b", location: "Frankfurt, Germany", lat: 50.1109, lon: 8.6821 },
            { accelerator: "N1+T4", regionId: "europe-west4", zones: "a, b, c", location: "Eemshaven, Netherlands", lat: 53.4427, lon: 6.8442 },
            { accelerator: "N1+T4", regionId: "me-west1", zones: "b, c", location: "Tel Aviv, Israel", lat: 32.0853, lon: 34.7818 },
            { accelerator: "N1+T4", regionId: "southamerica-east1", zones: "a, c", location: "Osasco, São Paulo, Brazil", lat: -23.5329, lon: -46.7920 },
            { accelerator: "N1+V100", regionId: "us-central1", zones: "a, b, c, f", location: "Council Bluffs, Iowa, USA", lat: 41.2619, lon: -95.8514 },
            { accelerator: "N1+V100", regionId: "us-east1", zones: "c", location: "Moncks Corner, South Carolina, USA", lat: 33.1957, lon: -79.9906 },
            { accelerator: "N1+V100", regionId: "us-west1", zones: "a, b", location: "The Dalles, Oregon, USA", lat: 45.5946, lon: -121.1787 },
            { accelerator: "N1+V100", regionId: "asia-east1", zones: "c", location: "Changhua County, Taiwan", lat: 24.0716, lon: 120.5469 },
            { accelerator: "N1+V100", regionId: "europe-west4", zones: "a, b, c", location: "Eemshaven, Netherlands", lat: 53.4427, lon: 6.8442 },
            { accelerator: "N1+P100", regionId: "us-central1", zones: "c, f", location: "Council Bluffs, Iowa, USA", lat: 41.2619, lon: -95.8514 },
            { accelerator: "N1+P100", regionId: "us-east1", zones: "b, c", location: "Moncks Corner, South Carolina, USA", lat: 33.1957, lon: -79.9906 },
            { accelerator: "N1+P100", regionId: "us-west1", zones: "a, b", location: "The Dalles, Oregon, USA", lat: 45.5946, lon: -121.1787 },
            { accelerator: "N1+P100", regionId: "asia-east1", zones: "a, c", location: "Changhua County, Taiwan", lat: 24.0716, lon: 120.5469 },
            { accelerator: "N1+P100", regionId: "australia-southeast1", zones: "c", location: "Sydney, Australia", lat: -33.8688, lon: 151.2093 },
            { accelerator: "N1+P100", regionId: "europe-west1", zones: "b, d", location: "St. Ghislain, Belgium", lat: 50.4377, lon: 3.8203 },
            { accelerator: "N1+P100", regionId: "europe-west4", zones: "a", location: "Eemshaven, Netherlands", lat: 53.4427, lon: 6.8442 },
            { accelerator: "N1+P4", regionId: "us-central1", zones: "a, c", location: "Council Bluffs, Iowa, USA", lat: 41.2619, lon: -95.8514 },
            { accelerator: "N1+P4", regionId: "us-east4", zones: "a, b, c", location: "Ashburn, Virginia, USA", lat: 39.0438, lon: -77.4874 },
            { accelerator: "N1+P4", regionId: "northamerica-northeast1", zones: "a, b, c", location: "Montréal, Québec, Canada", lat: 45.5017, lon: -73.5673 },
            { accelerator: "N1+P4", regionId: "us-west2", zones: "b, c", location: "Los Angeles, California, USA", lat: 34.0522, lon: -118.2437 },
            { accelerator: "N1+P4", regionId: "asia-southeast1", zones: "b, c", location: "Jurong West, Singapore", lat: 1.3521, lon: 103.8198 },
            { accelerator: "N1+P4", regionId: "australia-southeast1", zones: "a, b", location: "Sydney, Australia", lat: -33.8688, lon: 151.2093 },
            { accelerator: "N1+P4", regionId: "europe-west4", zones: "b, c", location: "Eemshaven, Netherlands", lat: 53.4427, lon: 6.8442 }
        ];

        // --- Process Data ---
        const locationsMap = new Map(); // Key: location string, Value: { lat, lon, accelerators: Set<string>, details: [] }

        rawData.forEach(item => {
            const locationKey = `${item.location}_${item.lat}_${item.lon}`; // Unique key for location
            if (!locationsMap.has(locationKey)) {
                locationsMap.set(locationKey, {
                    name: item.location,
                    lat: item.lat,
                    lon: item.lon,
                    accelerators: new Set(),
                    details: []
                });
            }
            const locData = locationsMap.get(locationKey);
            locData.accelerators.add(item.accelerator);
            locData.details.push({
                accelerator: item.accelerator,
                regionId: item.regionId,
                zones: item.zones,
                notes: item.notes || ''
            });
        });

        const uniqueAccelerators = [...new Set(rawData.map(item => item.accelerator))].sort();

        // --- Initialize Cesium Viewer ---
        const viewer = new Cesium.Viewer('cesiumContainer', {
            terrainProvider: Cesium.createWorldTerrain(), // Optional: Needs Ion account or self-hosted terrain
            // imageryProvider: new Cesium.IonImageryProvider({ assetId: YOUR_IMAGERY_ASSET_ID }), // Optional
            animation: false,
            baseLayerPicker: true,
            fullscreenButton: false,
            geocoder: false,
            homeButton: false,
            infoBox: true, // Enable InfoBox for entity details
            sceneModePicker: true,
            selectionIndicator: true,
            timeline: false,
            navigationHelpButton: false,
            scene3DOnly: true,
        });

        // Optional: Improve visual quality
        viewer.scene.globe.enableLighting = true;
        viewer.scene.fog.enabled = true;
        viewer.scene.skyAtmosphere.show = true;


        // --- Create Filters and Entities ---
        const filtersContainer = document.getElementById('acceleratorFilters');
        const entities = []; // To store references to Cesium entities

        function createEntity(locationData) {
            let description = `<h3>${locationData.name}</h3><hr><ul>`;
            locationData.details.forEach(detail => {
                description += `<li><b>${detail.accelerator}</b>
                                <br/>Region: ${detail.regionId} (Zones: ${detail.zones})
                                ${detail.notes ? `<br/><em>Note: ${detail.notes}</em>` : ''}
                               </li>`;
            });
            description += '</ul>';

            const entity = viewer.entities.add({
                name: locationData.name,
                position: Cesium.Cartesian3.fromDegrees(locationData.lon, locationData.lat),
                billboard: {
                    image: 'data:image/svg+xml;base64,' + btoa(`
                        <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="48" height="48">
                          <circle cx="12" cy="12" r="10" fill="#007bff" stroke="white" stroke-width="1.5"/>
                          <circle cx="12" cy="12" r="4" fill="white"/>
                        </svg>
                    `), // Simple blue dot SVG marker
                    width: 24,
                    height: 24,
                    verticalOrigin: Cesium.VerticalOrigin.BOTTOM,
                },
                description: description,
                label: {
                    text: locationData.name,
                    font: '12pt sans-serif',
                    style: Cesium.LabelStyle.FILL_AND_OUTLINE,
                    outlineWidth: 2,
                    outlineColor: Cesium.Color.BLACK,
                    verticalOrigin: Cesium.VerticalOrigin.BOTTOM,
                    pixelOffset: new Cesium.Cartesian2(0, -26), // Offset label above billboard
                    showBackground: true,
                    backgroundColor: new Cesium.Color(0.1, 0.1, 0.1, 0.7),
                    backgroundPadding: new Cesium.Cartesian2(7,5)
                },
                _accelerators: locationData.accelerators // Store accelerators for filtering
            });
            entities.push(entity);
        }

        locationsMap.forEach(createEntity);

        // --- Filtering Logic ---
        uniqueAccelerators.forEach(accel => {
            const checkboxId = `filter-${accel.replace(/\s+|\(|\)|\+/g, '-')}`; // Create valid ID

            const label = document.createElement('label');
            label.htmlFor = checkboxId;

            const checkbox = document.createElement('input');
            checkbox.type = 'checkbox';
            checkbox.id = checkboxId;
            checkbox.value = accel;
            checkbox.checked = true; // Default to show all
            checkbox.addEventListener('change', updateEntityVisibility);

            label.appendChild(checkbox);
            label.appendChild(document.createTextNode(accel));
            filtersContainer.appendChild(label);
        });

        function updateEntityVisibility() {
            const selectedAccelerators = [];
            filtersContainer.querySelectorAll('input[type="checkbox"]:checked').forEach(cb => {
                selectedAccelerators.push(cb.value);
            });

            entities.forEach(entity => {
                if (selectedAccelerators.length === 0) {
                    entity.show = false; // Hide if no filters selected
                } else {
                    // Show if the entity has AT LEAST ONE of the selected accelerators
                    const hasSelectedAccelerator = Array.from(entity._accelerators).some(accel => selectedAccelerators.includes(accel));
                    entity.show = hasSelectedAccelerator;
                }
            });
        }

        // Initial call to set visibility based on default checked states
        updateEntityVisibility();

        // Fly to a general overview
        viewer.camera.flyTo({
            destination: Cesium.Cartesian3.fromDegrees(-30, 20, 25000000), // Adjust as needed
            duration: 3
        });

    </script>
</body>
</html>