Bernt
58ca4e68db
- Go backend API with full CRUD for all modules (CRM, Sales, Finance, HR, Legal, Marketing, Support, Purchase, Inventory, Projects, Automation, Analytics) - Rust analytics service with parallel report generation - C runtime with POSIX shared memory IPC - PostgreSQL schema with 30+ tables, full migrations - Redis cache, sessions, pub/sub - Kafka event streaming with Zookeeper - WebSocket hub for real-time updates - Automation engine with cron jobs, workflows, event triggers - JWT authentication, multi-tenant from start - Docker Compose with all services - Nginx reverse proxy with rate limiting - Integration tests passing - Feature gap analysis against Fortnox/Odoo/Visma Refs: BOC-001
247 lines
16 KiB
HTML
247 lines
16 KiB
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<span class="breadcrumb-sep">/</span>
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<span>Geospatial Data</span>
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<span class="page-hero-label">Zoomer Academy</span>
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<h1>Geospatial data and GPS accuracy</h1>
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<p>Understanding GPS accuracy, location metadata and how geospatial data quality affects your quiXzoom mission approval rate.</p>
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</div>
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</div>
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<div class="content-wrap">
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<div class="content-section">
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<h2>Why location data matters</h2>
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<p>quiXzoom clients — highway authorities, property managers, insurance assessors, and infrastructure operators — use GPS coordinates from your submissions to build and update geospatial asset databases. Every approved photo is stored against a set of coordinates that will be queried, compared against previous surveys, and used to dispatch maintenance teams.</p>
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<p>A submission with accurate GPS coordinates adds a verified, georeferenced data point to a client's asset management system. A submission with degraded GPS accuracy creates a location uncertainty that may prevent the record from being associated with the correct asset — resulting in rejection.</p>
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<p>GPS quality is not a technicality. It is a core data quality dimension, as important as image sharpness or correct framing.</p>
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</div>
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<div class="content-section">
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<h2>GPS accuracy levels</h2>
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<p>Most smartphones report location using one of three accuracy modes. Always use <strong>precise</strong> mode for quiXzoom missions.</p>
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<table class="accuracy-table">
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<thead>
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<tr>
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<th>Mode</th>
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<th>Typical accuracy</th>
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<th>Method</th>
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<th>Status for missions</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>Coarse</td>
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<td>~50 m</td>
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<td>Cell tower triangulation only</td>
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<td class="red">Not acceptable</td>
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</tr>
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<tr>
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<td>Balanced</td>
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<td>~10 m</td>
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<td>Cell tower + Wi-Fi positioning</td>
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<td class="amber">Marginal — borderline rejection risk</td>
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</tr>
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<tr>
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<td>Precise</td>
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<td>Less than 3 m</td>
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<td>GPS satellite + GNSS fusion</td>
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<td class="green">Required for all missions</td>
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</tr>
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</tbody>
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</table>
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<div class="info-box">
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<strong>How to enable precise GPS</strong>
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iOS: Settings / Privacy & Security / Location Services — set to "Precise Location" per app. Android: Settings / Location / Mode — select "High accuracy" or "Device only (GPS)". Enable this before leaving for a mission, not at the capture site.
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</div>
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</div>
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<div class="content-section">
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<h2>EXIF metadata: what is stored in your photos</h2>
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<p>Every photo taken on a smartphone contains Exchangeable Image File (EXIF) metadata embedded in the image file. quiXzoom's review system reads this metadata on every submission. The following fields are verified:</p>
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<ul class="exif-list">
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<li class="exif-item"><strong>GPS Latitude / Longitude</strong><span>Asset location coordinates</span></li>
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<li class="exif-item"><strong>GPS Altitude</strong><span>Elevation above sea level</span></li>
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<li class="exif-item"><strong>GPS Timestamp</strong><span>Precise capture time (UTC)</span></li>
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<li class="exif-item"><strong>GPS DOP / Accuracy</strong><span>Dilution of precision indicator</span></li>
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<li class="exif-item"><strong>Make / Model</strong><span>Device used for capture</span></li>
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<li class="exif-item"><strong>DateTimeOriginal</strong><span>Local capture timestamp</span></li>
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<li class="exif-item"><strong>FocalLength</strong><span>Optical zoom detection</span></li>
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<li class="exif-item"><strong>DigitalZoomRatio</strong><span>Digital zoom detection</span></li>
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</ul>
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<p style="margin-top:18px">Do not edit, strip, or post-process submitted photos before upload. Third-party photo editing applications may remove or alter EXIF data, causing automated rejection even if the image quality is acceptable.</p>
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</div>
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<div class="content-section">
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<h2>Common GPS errors and how to avoid them</h2>
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<ul>
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<li><strong>Indoor GPS:</strong> GPS satellites cannot penetrate building structures. If you have been indoors, allow 45–90 seconds of open-sky exposure before your first capture. The GPS indicator in the quiXzoom app will show acquisition status.</li>
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<li><strong>Moving while capturing:</strong> Taking a photo while walking causes a timestamp-position mismatch as GPS position lags the device's physical movement. Stop, wait 2 seconds, then capture.</li>
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<li><strong>Tunnel exit drift:</strong> Exiting a tunnel, underground car park, or covered walkway causes GPS to re-acquire from a stale last-known position. A 60-second open-sky wait resolves this in most cases.</li>
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<li><strong>Urban canyon effect:</strong> In dense city centres with tall buildings on both sides, GPS multipath errors reduce accuracy to 5–15 m. Position yourself at a road junction or open area to achieve better sky view before capturing.</li>
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<li><strong>Location services disabled:</strong> The quiXzoom app requires location services to be enabled at all times during a mission. Disabling location mid-mission causes submissions to be stored without GPS data and automatically rejected.</li>
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</ul>
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</div>
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<div class="content-section">
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<h2>How to verify GPS status before starting</h2>
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<p>Before beginning any mission cluster, run through the following check:</p>
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<ul>
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<li>Open device Settings and confirm location mode is set to high accuracy or precise GPS.</li>
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<li>Open a maps application and confirm your displayed position matches your actual location to within one or two metres. If the position shown is more than 10 metres off, wait for re-acquisition.</li>
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<li>In the quiXzoom app, the mission view displays your current GPS accuracy radius. Begin capturing only when the accuracy indicator is below 5 metres.</li>
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<li>If GPS acquisition fails after 90 seconds outdoors, restart the device's location services (toggle off and on) and wait again.</li>
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</ul>
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</div>
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<div class="content-section">
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<h2>Impact on approval rate</h2>
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<p>Internal quiXzoom data shows a consistent relationship between GPS accuracy and mission approval outcomes:</p>
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<ul>
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<li>Missions submitted with GPS accuracy below 3 metres have an approval rate 23 percentage points higher than missions submitted with accuracy above 15 metres.</li>
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<li>GPS errors account for approximately 18% of all first-submission rejections across the platform.</li>
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<li>GPS-related rejections are entirely preventable with correct device configuration and pre-mission verification.</li>
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</ul>
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<div class="info-box">
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<strong>One habit that matters</strong>
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Enable high accuracy location mode when you leave home for a mission session. Do not wait until you arrive at the first capture point. Early activation gives the GPS chipset time to acquire a stable satellite fix before you need it.
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</div>
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</div>
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<div class="cta-block">
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<h3>Put accurate geospatial data to work</h3>
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<p>Every well-located submission you make contributes to a geospatial asset record used by clients across Europe. Apply these practices from your first mission.</p>
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<a href="https://app.quixzoom.com" class="cta-btn">Start earning with quality submissions →</a>
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<a href="/academy/road-condition-monitoring/">← Road Condition Monitoring</a>
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<a href="/academy/">Back to Academy overview →</a>
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