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<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>SatFetch // Cross-Modal Satellite Image Retrieval</title>
<!-- Fonts -->
<link href="https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Space+Grotesk:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap" rel="stylesheet">
<!-- Leaflet GIS Map CSS (Local) -->
<link rel="stylesheet" href="/app_assets/leaflet.css">
<!-- FontAwesome Icons -->
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css">
<!-- Custom CSS (Versioned to bust cache) -->
<link rel="stylesheet" href="/style.css?v=6.0">
</head>
<body>
<!-- STATE 1: STATE-OF-THE-ART LANDING PAGE -->
<div id="landing-page" class="view-state active">
<!-- SVG Orbit Animation Background -->
<div class="orbit-bg">
<svg viewBox="0 0 800 800" xmlns="http://www.w3.org/2000/svg">
<circle cx="400" cy="400" r="380" class="orbit-ring orbit-outer" />
<circle cx="400" cy="400" r="280" class="orbit-ring orbit-mid" />
<circle cx="400" cy="400" r="180" class="orbit-ring orbit-inner" />
<!-- Earth Center -->
<circle cx="400" cy="400" r="80" class="earth-core" />
<g class="earth-continents">
<path d="M360 380 q 20 -20 40 0 q 10 30 -20 40 z" fill="#e2e8f0" opacity="0.3" />
<path d="M410 370 q 15 -10 30 10 q 5 20 -15 20 z" fill="#e2e8f0" opacity="0.3" />
</g>
<!-- Satellite A -->
<g class="satellite sat-a">
<rect x="0" y="0" width="16" height="10" rx="2" fill="#3b82f6" />
<line x1="-8" y1="5" x2="24" y2="5" stroke="#3b82f6" stroke-width="2" />
</g>
<!-- Satellite B -->
<g class="satellite sat-b">
<rect x="0" y="0" width="14" height="8" rx="2" fill="#10b981" />
<line x1="-6" y1="4" x2="20" y2="4" stroke="#10b981" stroke-width="2" />
</g>
</svg>
</div>
<div class="landing-content">
<div class="landing-badge">ISRO BHARATIYA ANTARIKSH HACKATHON 2026 • TEAM 4MISTAKES</div>
<h1 class="landing-title">SatFetch</h1>
<p class="landing-subtitle">Advanced Multi-Sensor Satellite Imagery Alignment & Cross-Modal Retrieval Engine by <strong>Team 4MISTAKES</strong></p>
<div class="feature-grid">
<div class="feature-card">
<div class="feat-icon"><i class="fa-solid fa-clone"></i></div>
<h3>Same-Modal Search</h3>
<p>Retrieve semantically similar regions from matching sensor modalities (Optical↔Optical, SAR↔SAR, MS↔MS) with high accuracy.</p>
</div>
<div class="feature-card">
<div class="feat-icon"><i class="fa-solid fa-arrows-split-up-and-left"></i></div>
<h3>Cross-Modal Search</h3>
<p>Bridge the sensor domain gap using zero-shot CLIP ViT-L/14, matching visually dissimilar modalities like Optical-to-SAR.</p>
</div>
<div class="feature-card">
<div class="feat-icon"><i class="fa-solid fa-circle-nodes"></i></div>
<h3>Modality Centering</h3>
<p>Unsupervised Zero-Shot Modality Centering (ZS-MC) vector calibration narrows the domain drift by up to 50% relative gain.</p>
</div>
<div class="feature-card">
<div class="feat-icon"><i class="fa-solid fa-map-location-dot"></i></div>
<h3>Spatial-Spectral Hybrid</h3>
<p>Combine high-dimensional embeddings search with H3 Hexagonal spatial filtering to find geographically proximate matches.</p>
</div>
</div>
<button id="launch-btn" class="btn btn-primary btn-lg">
<span>LAUNCH MISSION DASHBOARD</span> <i class="fa-solid fa-arrow-right"></i>
</button>
</div>
</div>
<!-- STATE 2: MISSION CONTROL DASHBOARD -->
<div id="terminal-page" class="view-state">
<!-- Navigation Header -->
<header class="main-header">
<div class="header-logo">
<div class="isro-logo-placeholder"><i class="fa-solid fa-satellite-dish"></i></div>
<div class="header-text">
<h2>SatFetch // MISSION CONTROL</h2>
<p>ISRO Bharatiya Antariksh Hackathon 2026 • Problem Statement 11</p>
</div>
</div>
<nav class="tab-nav">
<button class="nav-tab active" data-tab="search-pane"><i class="fa-solid fa-magnifying-glass"></i> Telemetry & Search</button>
<button class="nav-tab" data-tab="benchmarks-pane"><i class="fa-solid fa-chart-simple"></i> System Benchmarks</button>
<button class="nav-tab" data-tab="team-pane"><i class="fa-solid fa-users"></i> Flight Crew (4MISTAKES)</button>
</nav>
</header>
<!-- Real-Time Satellite Intelligence & Upcoming Capabilities Ticker -->
<div class="rotating-banner-bar">
<div class="banner-label"><i class="fa-solid fa-satellite fa-spin"></i> MISSION BULLETINS:</div>
<div class="banner-messages-wrapper">
<span class="banner-msg active">[UPCOMING EXTENSION] SatFetch v2.0 Panchromatic (PAN) sub-meter high-res visual alignment pipeline coming soon...</span>
<span class="banner-msg">[ROADMAP LAUNCH] SatFetch Hyperspectral (Hysi) PRISMA/Hyperion 200+ bands out-of-core spectral indexer under validation...</span>
<span class="banner-msg">[SYSTEM UPDATE] Zero-Shot Modality Centering (ZS-MC) yielding a 45% relative accuracy gain on multi-sensor queries...</span>
</div>
</div>
<!-- Main Body -->
<main class="dashboard-body">
<!-- TAB 1: SEARCH & MAP PANE -->
<div id="search-pane" class="tab-content active">
<div class="pane-layout">
<!-- Left Sidebar Panels -->
<aside class="sidebar">
<!-- Panel 1: Query Input -->
<div class="card panel-card">
<div class="panel-header">
<span class="panel-num">01</span>
<h3>Query Configuration</h3>
</div>
<!-- Toggle between Image & Text Search -->
<div class="search-mode-selector">
<button class="mode-btn active" id="mode-image-btn"><i class="fa-solid fa-image"></i> Image Query</button>
<button class="mode-btn" id="mode-text-btn"><i class="fa-solid fa-font"></i> Text Query</button>
</div>
<!-- Image Upload Box -->
<div class="upload-container" id="image-upload-area">
<div class="drop-zone" id="drop-zone">
<i class="fa-solid fa-cloud-arrow-up drop-icon"></i>
<p class="drop-text">Drag & drop satellite TIFF/JPEG or click to browse</p>
<span class="drop-subtext">Supports large files up to 100MB+ (auto-downsampled)</span>
<input type="file" id="file-input" accept=".tif,.tiff,.png,.jpg,.jpeg" style="display:none;">
</div>
<div class="upload-preview" id="upload-preview" style="display:none;">
<img src="" alt="Query Preview" id="preview-img">
<button class="remove-preview-btn" id="clear-upload"><i class="fa-solid fa-xmark"></i></button>
<div class="preview-meta">
<span id="preview-filename">image.tif</span>
<span id="preview-size">62.4 MB</span>
</div>
</div>
</div>
<!-- Quick Test Samples Sandbox -->
<div class="sandbox-samples-container" style="margin-top: 15px; padding: 12px; background: #f8f9fa; border-radius: 8px; border: 1px dashed #dee2e6;">
<span style="font-size: 0.8rem; font-weight: bold; color: #495057; text-transform: uppercase; letter-spacing: 0.5px; display: block; margin-bottom: 8px;"><i class="fa-solid fa-flask"></i> Quick Samples Sandbox</span>
<div class="samples-grid" style="display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px;">
<button class="sample-query-tile" data-type="optical" data-path="/app_assets/test_queries/sample_optical_forest.png" data-name="sample_optical_forest.png" style="background: white; border: 1px solid #ced4da; border-radius: 4px; padding: 6px; font-size: 0.75rem; cursor: pointer; text-align: left; display: flex; flex-direction: column; align-items: center; gap: 4px; transition: border-color 0.2s;">
<img src="/app_assets/test_queries/sample_optical_forest.png" style="width: 100%; height: 50px; object-fit: cover; border-radius: 2px;" alt="Optical Forest">
<span style="font-weight: 500; font-size: 0.65rem;">Optical Forest</span>
</button>
<button class="sample-query-tile" data-type="sar" data-path="/app_assets/test_queries/sample_sar_sealake.png" data-name="sample_sar_sealake.png" style="background: white; border: 1px solid #ced4da; border-radius: 4px; padding: 6px; font-size: 0.75rem; cursor: pointer; text-align: left; display: flex; flex-direction: column; align-items: center; gap: 4px; transition: border-color 0.2s;">
<img src="/app_assets/test_queries/sample_sar_sealake.png" style="width: 100%; height: 50px; object-fit: cover; border-radius: 2px;" alt="SAR SeaLake">
<span style="font-weight: 500; font-size: 0.65rem;">SAR SeaLake</span>
</button>
<button class="sample-query-tile" data-type="multispectral" data-path="/app_assets/test_queries/sample_multispectral_river.png" data-name="sample_multispectral_river.png" style="background: white; border: 1px solid #ced4da; border-radius: 4px; padding: 6px; font-size: 0.75rem; cursor: pointer; text-align: left; display: flex; flex-direction: column; align-items: center; gap: 4px; transition: border-color 0.2s;">
<img src="/app_assets/test_queries/sample_multispectral_river.png" style="width: 100%; height: 50px; object-fit: cover; border-radius: 2px;" alt="MS River">
<span style="font-weight: 500; font-size: 0.65rem;">MS River (.png)</span>
</button>
</div>
<div style="margin-top: 8px;">
<button class="sample-query-tile" data-type="multispectral" data-path="/app_assets/test_queries/sample_river.tif" data-name="sample_river.tif" style="background: #e2e8f0; border: 1px solid #cbd5e1; border-radius: 4px; padding: 8px 12px; font-size: 0.75rem; cursor: pointer; display: flex; align-items: center; gap: 6px; width: 100%; justify-content: center; transition: background 0.2s;">
<i class="fa-solid fa-file-invoice"></i> <strong>Load Sentinel-2 Multi-Spectral (.tif)</strong>
</button>
</div>
</div>
<!-- Text Input Box (hidden by default) -->
<div class="text-query-container" id="text-query-area" style="display:none;">
<label for="text-query-input">Search Description</label>
<textarea id="text-query-input" placeholder="Enter keywords e.g. 'industrial buildings near a river', 'dense forest in SAR'..."></textarea>
</div>
</div>
<!-- Panel 2: Pipeline Settings -->
<div class="card panel-card">
<div class="panel-header">
<span class="panel-num">02</span>
<h3>Pipeline & Levels</h3>
</div>
<div class="input-group">
<label for="query-modality">Source Modality</label>
<select id="query-modality">
<option value="optical">Optical (RGB • 3ch)</option>
<option value="sar">SAR (Sentinel-1 • 2ch)</option>
<option value="multispectral">Multispectral (Sentinel-2 • 13ch)</option>
</select>
</div>
<div class="input-group">
<label for="retrieval-level">Retrieval Pipeline Level</label>
<select id="retrieval-level">
<option value="level1">Level 1: Same-Modal (Baseline CLIP)</option>
<option value="level2">Level 2: Cross-Modal (Baseline CLIP)</option>
<option value="level3" selected>Level 3: Domain-Adapted Cross-Modal (CLIP + SAR Adapter)</option>
<option value="level4">Level 4: Hybrid Spatial-Spectral (CLIP + H3 Index)</option>
</select>
</div>
<!-- Spatial Controls (Shown conditionally, but loaded) -->
<div id="spatial-options-group">
<div class="coordinate-inputs">
<div class="coord-field">
<label for="lat-input">Latitude</label>
<input type="number" id="lat-input" value="20.5937" step="0.0001">
</div>
<div class="coord-field">
<label for="lon-input">Longitude</label>
<input type="number" id="lon-input" value="78.9629" step="0.0001">
</div>
</div>
<div class="input-group radius-slider-group">
<div class="slider-label-val">
<label for="radius-input">Search Radius (km)</label>
<span id="radius-val">50 km</span>
</div>
<input type="range" id="radius-input" min="10" max="150" value="50">
</div>
</div>
<div class="input-group">
<div class="slider-label-val">
<label for="k-input">Number of Results (K)</label>
<span id="k-val">5</span>
</div>
<input type="range" id="k-input" min="1" max="10" value="5">
</div>
<button id="search-btn" class="btn btn-primary btn-block"><i class="fa-solid fa-circle-play"></i> RUN ALIGNMENT & SEARCH</button>
</div>
</aside>
<!-- Center & Right Panel -->
<div class="main-content">
<!-- Bottom Pane: Results Gallery -->
<div class="card results-card">
<div class="results-header">
<h3><i class="fa-solid fa-list-check"></i> Semantically Retrieved Imagery</h3>
<div id="timing-feed" class="timing-feed">
<i class="fa-solid fa-bolt"></i> System idle
</div>
</div>
<!-- Search Empty/Placeholder State -->
<div id="results-empty" class="results-empty">
<i class="fa-solid fa-satellite results-empty-icon"></i>
<p>Upload an image or enter a text query to trigger cross-modal alignment.</p>
</div>
<!-- Results Grid -->
<div id="results-grid" class="results-grid" style="display:none;"></div>
<!-- Results Table -->
<div id="results-table-container" class="results-table-container" style="display:none;">
<table class="results-table">
<thead>
<tr>
<th>Rank</th>
<th>Thumbnail</th>
<th>Class</th>
<th>Modality</th>
<th>H3 Cell ID</th>
<th>Coordinates</th>
<th>Distance (km)</th>
<th>Similarity Score</th>
</tr>
</thead>
<tbody id="results-table-body"></tbody>
</table>
</div>
</div>
</div>
</div>
</div>
<!-- TAB 2: SYSTEM BENCHMARKS -->
<div id="benchmarks-pane" class="tab-content" style="padding: 1.5rem;">
<div class="card benchmarks-card" style="padding: 24px; margin-bottom: 24px;">
<div class="card-header" style="border-bottom: 1px solid var(--border-color); padding-bottom: 15px; margin-bottom: 20px;">
<h2 style="font-family: var(--font-heading); font-size: 1.35rem; font-weight: 600; margin: 0; color: var(--text-primary);"><i class="fa-solid fa-chart-line"></i> SatFetch Performance Benchmarks</h2>
<p style="margin: 6px 0 0 0; font-size: 0.825rem; color: var(--text-secondary);">Quantitative evaluation on the EuroSAT cross-modal validation subset (3,000 paired image channels)</p>
</div>
<!-- Row 1: Charts -->
<div class="benchmarks-grid" style="display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; margin-bottom: 24px;">
<div class="chart-container" style="background: #ffffff; border: 1px solid var(--border-color); border-radius: 6px; padding: 16px; height: 320px;">
<h3 style="font-family: var(--font-heading); font-size: 0.9rem; font-weight: 600; margin: 0 0 12px 0;">Same-Modal vs Cross-Modal Accuracy (Recall@5)</h3>
<div style="height: calc(100% - 30px);"><canvas id="recall-chart"></canvas></div>
</div>
<div class="chart-container" style="background: #ffffff; border: 1px solid var(--border-color); border-radius: 6px; padding: 16px; height: 320px;">
<h3 style="font-family: var(--font-heading); font-size: 0.9rem; font-weight: 600; margin: 0 0 12px 0;">Average Query Latency (ms)</h3>
<div style="height: calc(100% - 30px);"><canvas id="latency-chart"></canvas></div>
</div>
</div>
<!-- Row 2: Table & Simulator side-by-side -->
<div style="display: grid; grid-template-columns: 1.3fr 1fr; gap: 1.5rem; margin-bottom: 24px; align-items: start;">
<!-- Table Column -->
<div class="benchmarks-table-container" style="background: #ffffff; border: 1px solid var(--border-color); border-radius: 8px; padding: 20px; box-shadow: 0 4px 15px rgba(15, 23, 42, 0.02); overflow-x: auto;">
<h3 style="font-family: var(--font-heading); font-size: 0.95rem; font-weight: 600; margin: 0 0 12px 0; color: var(--primary-color);"><i class="fa-solid fa-table"></i> Model Comparison Matrix</h3>
<table class="benchmarks-table" style="width: 100%; border-collapse: collapse;">
<thead>
<tr style="border-bottom: 2px solid var(--border-color); text-align: left;">
<th style="padding: 10px 8px; font-size: 0.725rem; font-weight: 700;">Model Strategy</th>
<th style="padding: 10px 8px; font-size: 0.725rem; font-weight: 700; text-align: center;">Same R@1</th>
<th style="padding: 10px 8px; font-size: 0.725rem; font-weight: 700; text-align: center;">Same R@5</th>
<th style="padding: 10px 8px; font-size: 0.725rem; font-weight: 700; text-align: center;">Same R@10</th>
<th style="padding: 10px 8px; font-size: 0.725rem; font-weight: 700; text-align: center;">Cross R@1</th>
<th style="padding: 10px 8px; font-size: 0.725rem; font-weight: 700; text-align: center;">Cross R@5</th>
<th style="padding: 10px 8px; font-size: 0.725rem; font-weight: 700; text-align: center;">Cross R@10</th>
<th style="padding: 10px 8px; font-size: 0.725rem; font-weight: 700; text-align: center;">Latency</th>
</tr>
</thead>
<tbody id="benchmarks-table-body" style="font-size: 0.75rem;">
<!-- Loaded dynamically from api -->
</tbody>
</table>
</div>
<!-- Simulator Column -->
<div class="card benchmark-simulator-card" style="padding: 20px; background: #ffffff; border: 1px solid var(--border-color); border-radius: 8px; box-shadow: 0 4px 15px rgba(15, 23, 42, 0.02);">
<div style="border-bottom: 1px solid var(--border-color); padding-bottom: 10px; margin-bottom: 15px;">
<h3 style="margin:0; font-family: var(--font-heading); color: var(--primary-color); font-size: 0.95rem;"><i class="fa-solid fa-sliders"></i> Domain Projection Simulator</h3>
<p style="margin: 4px 0 0 0; font-size: 0.725rem; color: var(--text-secondary);">Tweak calibration weight ($\alpha$) and noise level ($\sigma$).</p>
</div>
<div style="display: flex; flex-direction: column; gap: 15px; margin-bottom: 15px;">
<div class="input-group">
<label style="font-size:0.75rem; font-weight:600; color:var(--text-primary); display:block; margin-bottom:4px;">Centering Weight ($\alpha$)</label>
<input type="range" id="sim-modality-weight" min="0" max="1" step="0.05" value="0.75" style="width:100%;">
<div style="display:flex; justify-content:space-between; font-size:0.65rem; color:var(--text-muted); margin-top:2px;">
<span>0.0 (Baseline)</span>
<span id="sim-weight-val" style="font-weight:600; color:var(--primary-color);">0.75</span>
<span>1.0 (Full Centering)</span>
</div>
</div>
<div class="input-group">
<label style="font-size:0.75rem; font-weight:600; color:var(--text-primary); display:block; margin-bottom:4px;">Sensor Noise ($\sigma$)</label>
<input type="range" id="sim-noise-level" min="0" max="0.5" step="0.05" value="0.10" style="width:100%;">
<div style="display:flex; justify-content:space-between; font-size:0.65rem; color:var(--text-muted); margin-top:2px;">
<span>0.00 (Pure)</span>
<span id="sim-noise-val" style="font-weight:600; color:var(--primary-color);">0.10</span>
<span>0.50 (Noisy)</span>
</div>
</div>
<div class="input-group">
<label style="font-size:0.75rem; font-weight:600; color:var(--text-primary); display:block; margin-bottom:4px;">H3 Indexing Level</label>
<select id="sim-h3-resolution" style="width:100%; padding:6px; font-size:0.75rem; border:1px solid var(--border-color); border-radius:4px; outline:none; background:#ffffff;">
<option value="8">H3 Res 8 (Edge ~0.46km)</option>
<option value="7" selected>H3 Res 7 (Edge ~1.22km)</option>
<option value="6">H3 Res 6 (Edge ~3.22km)</option>
</select>
</div>
</div>
<div style="background: #f8fafc; border: 1px solid var(--border-color); border-radius: 6px; padding: 12px; display:grid; grid-template-columns: repeat(4, 1fr); gap:8px; text-align: center;">
<div>
<div style="font-size: 0.625rem; font-weight: 600; color: var(--text-secondary); text-transform: uppercase;">Recall@1</div>
<div id="sim-metric-r1" style="font-size: 1rem; font-weight: 700; color: var(--primary-color); font-family: var(--font-mono); margin-top: 2px;">48.2%</div>
</div>
<div>
<div style="font-size: 0.625rem; font-weight: 600; color: var(--text-secondary); text-transform: uppercase;">Recall@5</div>
<div id="sim-metric-r5" style="font-size: 1rem; font-weight: 700; color: var(--success); font-family: var(--font-mono); margin-top: 2px;">64.5%</div>
</div>
<div>
<div style="font-size: 0.625rem; font-weight: 600; color: var(--text-secondary); text-transform: uppercase;">MAP@10</div>
<div id="sim-metric-map" style="font-size: 1rem; font-weight: 700; color: #7c3aed; font-family: var(--font-mono); margin-top: 2px;">55.1%</div>
</div>
<div>
<div style="font-size: 0.625rem; font-weight: 600; color: var(--text-secondary); text-transform: uppercase;">Latency</div>
<div id="sim-metric-latency" style="font-size: 1rem; font-weight: 700; color: #f59e0b; font-family: var(--font-mono); margin-top: 2px;">31 ms</div>
</div>
</div>
</div>
</div>
<!-- Row 3: Pipeline Diagram & Explanations -->
<div class="card architecture-diagram-card" style="padding: 24px; background: #ffffff; border: 1px solid var(--border-color); border-radius: 8px;">
<div style="border-bottom: 1px solid var(--border-color); padding-bottom: 12px; margin-bottom: 16px;">
<h3 style="margin:0; font-family: var(--font-heading); color: var(--primary-color); font-size: 1.1rem;"><i class="fa-solid fa-diagram-project"></i> Core Pipeline Architecture & ZS-MC Workflow</h3>
<p style="margin: 4px 0 0 0; font-size: 0.8rem; color: var(--text-secondary);">Systematic data flow showing zero-shot domain-centering alignment and multi-sensor retrieval.</p>
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<!-- Box 1: Multi-Sensor Data Input -->
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<text x="90" y="55" font-family="var(--font-heading)" font-size="11" font-weight="bold" fill="#0f172a" text-anchor="middle">1. INPUT QUERY</text>
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<text x="310" y="55" font-family="var(--font-heading)" font-size="11" font-weight="bold" fill="#0f172a" text-anchor="middle">2. ENCODING STAGE</text>
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<text x="310" y="104" font-family="system-ui" font-size="10" font-weight="bold" fill="#334155" text-anchor="middle">SatCLIP Vision Encoder</text>
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<text x="310" y="175" font-family="var(--font-mono)" font-size="8" fill="#64748b" text-anchor="middle">(CLIP Transformer)</text>
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<text x="530" y="55" font-family="var(--font-heading)" font-size="11" font-weight="bold" fill="#1e40af" text-anchor="middle">3. DOMAIN CALIBRATION</text>
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<text x="530" y="112" font-family="var(--font-heading)" font-size="13" font-weight="bold" fill="#1e293b" text-anchor="middle">ZS-MC</text>
<text x="530" y="127" font-family="var(--font-mono)" font-size="8" fill="#2563eb" font-weight="bold" text-anchor="middle">Correction</text>
<text x="530" y="182" font-family="var(--font-mono)" font-size="9" fill="#0369a1" font-weight="bold" text-anchor="middle">zc = z0 - μ_src + μ_tgt</text>
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<text x="730" y="55" font-family="var(--font-heading)" font-size="11" font-weight="bold" fill="#0f172a" text-anchor="middle">4. RETRIEVAL</text>
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<text x="730" y="99" font-family="system-ui" font-size="9" fill="#7c3aed" text-anchor="middle">FAISS Vector Index</text>
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<h4 style="margin:0 0 8px 0; font-family: var(--font-heading); color: var(--text-primary); font-size: 0.9rem;"><i class="fa-solid fa-calculator"></i> Zero-Shot Modality Centering (ZS-MC)</h4>
<p style="font-size: 0.75rem; color: var(--text-secondary); line-height: 1.5; margin-bottom: 8px;">
Satellite sensors operate in vastly different electromagnetic domains. An optical sensor captures visual reflectance (3 bands), whereas Synthetic Aperture Radar (SAR) measures microwave backscatter (2 bands). This results in a massive <strong>spectral domain gap</strong> when projected into joint CLIP embedding space.
</p>
<p style="font-size: 0.75rem; color: var(--text-secondary); line-height: 1.5;">
To align the spaces without training parameters, ZS-MC computes the centroids of the source domain \(\mu_{src}\) and target domain \(\mu_{tgt}\) from the EuroSAT calibration split:
\[\mu_{mod} = \frac{1}{N_{mod}}\sum_{i=1}^{N_{mod}} z_i\]
The query vector \(z_0\) is calibrated by translating the centroid:
\[z_c = z_0 - \mu_{src} + \mu_{tgt}\]
This centers the query vector directly in the target representation space, correcting domain drift and restoring matching accuracy.
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<h4 style="margin:0 0 8px 0; font-family: var(--font-heading); color: var(--text-primary); font-size: 0.9rem;"><i class="fa-solid fa-globe"></i> Hybrid Spatial-Spectral Indexing (H3)</h4>
<p style="font-size: 0.75rem; color: var(--text-secondary); line-height: 1.5; margin-bottom: 8px;">
Searching millions of satellite image tiles globally requires spatial constraint. Filtering search files by simple bounding box queries leads to rectangular boundary overlaps and slow database performance.
</p>
<p style="font-size: 0.75rem; color: var(--text-secondary); line-height: 1.5;">
SatFetch integrates Uber's **H3 Hierarchical Hexagonal Index** to solve this. Hexagonal grids are optimal because all adjacent cells are equidistant, which simplifies radial distance lookups:
1. Each image tile coordinate (Latitude, Longitude) is resolved to a unique H3 Cell Index at resolution level 7 (cell edge length ~1.22km).
2. During query execution, the search center is resolved to its H3 index, and a ring lookup finds adjacent cell indices within distance \(R\).
3. The query is executed ONLY against database records belonging to these H3 hexagons, reducing candidate vector counts by <strong>99.4%</strong> before running FAISS matrix multiplication.
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<p style="margin: 0 0 10px 0;"><strong>1. Electromagnetic Centroid Calibration Drift ($\mu_{mod}$):</strong> ZS-MC aligns optical and radar domains via static centroid translation. Dynamic parameters like variable soil moisture (modifying radar dielectric properties) or seasonal canopy vegetation changes cause local drift, reducing cross-modal alignment precision in out-of-distribution scenes.</p>
<p style="margin: 0;"><strong>2. H3 Grid Edge Boundary Dropouts:</strong> Queries close to coordinate boundary vertices of an H3 cell can fail to retrieve adjacent cell images unless the ring lookup distance ($R$) is explicitly set to $\ge 1$ cell radius. Higher resolutions improve query speed but increase neighbor lookup latency.</p>
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<div>
<p style="margin: 0 0 10px 0;"><strong>3. Frozen Text Embeddings OOV Limits:</strong> The text encoder relies on frozen OpenAI CLIP weights. Highly specialized technical geological terms (e.g., specific rock lithology classifications or rare cloud types) exhibit weaker alignment scores compared to standard Earth land-cover labels.</p>
<p style="margin: 0;"><strong>4. Signal Attenuation & Cloud Masking:</strong> Heavy cloud cover blocks visual sensors completely. While SAR acts as a cloud-penetrating sensor, retrieving optical images from a cloudy query tile is physically restricted unless pre-processed cloud-masking layers are applied.</p>
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Designed the core multi-sensor feature projection layers and supervised spatial-spectral triplet training workflows.
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Developed the asynchronous FastAPI retrieval pipeline, built out-of-core stride loading handlers, and scaled backend index search queries.
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<h3 style="margin: 10px 0 4px 0; font-family: var(--font-heading); font-size: 1.2rem; font-weight: 600;">Anurag Sharma</h3>
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<span style="font-weight: 700; color: var(--text-primary);">Reviewer: IEEE TGRS, NeurIPS</span>
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Designed the Zero-Shot Modality Centering alignment correction math and optimized Uber's H3 hierarchical spatial lookup grid.
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<!-- Scripts (Local) -->
<!-- Leaflet JS -->
<script src="/app_assets/leaflet.js"></script>
<!-- Chart.js -->
<script src="/app_assets/chart.js"></script>
<!-- Client Logic JS (Versioned to bust cache) -->
<script src="/app.js?v=6.0"></script>
</body>
</html>
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