7.3 Mobile Viewer and Field QC
The mobile viewer in LCC Scan lets you review scan data on-site before you leave. A gap found in the viewer while the scanner is still in your hands costs a few minutes to fix. The same gap found back at the office means a return visit.
Accessing the Mobile Viewer
After stopping a scan, the project appears as a card in the LCC Scan gallery. Each card shows the scan date, total duration, and scan distance. Tap the card to open the detail view, then tap View Model to open the mobile 3D viewer. The viewer loads the scan data directly from the device storage and does not require a network connection.
The mobile viewer is available before data transfer. You do not need to copy the files to the workstation or run any processing before reviewing the scan in the viewer. This is the on-site review step, and it should be completed before leaving any scan location.
The mobile viewer renders the unprocessed scan data, not a final processed model. What you see is the raw SLAM output. Some imperfections visible in the viewer may improve after LCC Studio processing. However, coverage gaps and large drift artifacts will not be corrected in processing and must be addressed by re-scanning in the field.
Navigation Gestures
The mobile viewer uses touch gestures for all navigation. There is no on-screen joystick or button-based navigation. Knowing the gestures before you need them in the field saves time during review.
For initial review, zoom out to see the full scan extent first. This gives you an overview of the total coverage and the scan path. Then zoom into areas that look thin, fragmented, or show trajectory discontinuities to assess whether they represent actual coverage gaps.
Viewing Modes
The mobile viewer toolbar at the bottom of the screen provides access to multiple viewing modes. Switching between modes reveals different aspects of the scan data quality and coverage.
For field QC, the height-colored mode is the most efficient way to verify that multi-height trajectories achieved full vertical coverage. Areas that appear as flat single-color planes in height mode when they should show a gradient from floor to ceiling indicate that the scanner only captured the space from one elevation.
Coverage Analysis Tool
The coverage analysis tool overlays a color-coded quality map on the scan data. The bar at the top of the screen shows the scale from Good to Low. Areas of the scan receive a color value based on point density and data quality at that location.
Green areas meet coverage quality targets. Yellow areas have reduced point density or quality, often from high-speed scanning, extreme angles, or limited scan passes. Red areas have insufficient coverage and will produce poor or failed reconstruction results in LCC Studio.
Red areas in the coverage tool require re-scanning before you leave. A red coverage zone does not mean the data is slightly degraded. It means the data in that zone is unlikely to produce usable reconstruction geometry. Identify the cause: was the area skipped, was the scanner moving too fast, was it too far from the surfaces? Then re-scan accordingly and re-check the coverage tool before packing up.
Common Causes of Yellow and Red Coverage Zones
- Walking too fast through the area on a single pass
- Only capturing from one height level in a space that needed multi-height coverage
- Staying too far from detailed surfaces such as signage, instrumentation panels, or recessed areas
- Scanning through glass or highly reflective surfaces without supplemental passes from additional angles
- Narrow corridors or deep recesses that the scanner passed without pointing the front camera directly at the geometry
Basic Measurements in the Viewer
The mobile viewer includes a measurement tool accessible from the toolbar. You can place two points in the 3D view and read the distance between them. This is not a survey-grade measurement tool and should not be used as a substitute for verified field measurements. It is useful for a quick sanity check of major dimensions before leaving the site: confirming that a corridor reads approximately the correct width, or that a floor-to-ceiling height is plausible given the known building specifications.
If a measurement is significantly off from what you know the space to be, investigate further. A 5-meter corridor reading as 8 meters in the viewer indicates a drift or tracking problem in the scan, not a measurement tolerance. That level of discrepancy requires a re-scan.
Field Verification Checklist
Complete this review before leaving any scan site. Once you have left and the equipment is packed, fixing problems becomes significantly more costly.
All scan segments are saved and confirmed. Each segment should have returned to solid green LED before you powered off. Verify each project card appears in the LCC Scan gallery with a valid duration and size.
Coverage analysis tool shows no red zones in required areas. Open the coverage tool for each segment and review. Yellow zones in low-priority areas may be acceptable; red zones in areas the deliverable depends on are not.
Multi-height coverage completed for all spaces requiring it. In height-colored view, verify that spaces needing full vertical coverage show the expected elevation gradient. Flat single-color areas in a multi-level space indicate incomplete height coverage.
Control point locations documented and photographed. If the project uses control points for Map Fusion, confirm each point appears in the scan data via the point list in LCC Scan. Photograph the physical location of each point before leaving.
No major trajectory discontinuities visible in progressive display mode. In progressive mode, trace the scan path. Large jumps or sudden position changes in the trajectory indicate a tracking loss event that may require re-scanning the affected area.
Sanity check on at least one major dimension. Use the measurement tool to verify one known dimension in the space. A corridor width, room length, or ceiling height that matches the known value confirms basic scan geometry is coherent.
Device battery is above 50% for firmware updates if required. If a firmware update is needed before the next scan session, the battery must be above 50% during the update process. Do not begin a firmware update with a low battery.