Construction progress monitoring and change tracking
Progress monitoring means surveying the same site by drone at set intervals — weekly, monthly or per valuation period — and comparing the results. Each period gets an orthomosaic and surface model, and progress is documented with dates through change maps and side-by-side visuals.
What you get
An orthomosaic and terrain model for each period, a change (difference) map, digitised completed works (SHP/DWG), before/after visuals and a period report (PDF). Optionally, a web viewer with a timeline.
Applications
- Site progress reports
- Investor and client updates
- Periodic change maps
- Dated evidence in disputes
Site progress reports, updates for investors and the client’s engineer, valuation period records, infrastructure and building progress, fill and excavation progress, and dated evidence in disputes.
How we keep it consistent
The same flight plan, ground control and processing settings are used every period, so differences between surveys reflect the work done — not the method.
Choosing a frequency
Weekly, fortnightly or monthly flights depending on the pace of work and your reporting cycle; frequency can be stepped up in critical phases such as filling and foundations.
How it works
- ScopingWe confirm the site location and extent, the deliverables you need and the accuracy required, and check airspace permissions and site conditions.
- Flight planning and ground controlOverlap, flight altitude and ground sampling distance (GSD) are set to meet the spec; ground control points (GCPs) are surveyed with GNSS where required.
- Data captureThe site is flown to plan, capturing imagery and position data with RTK/PPK positioning.
- Photogrammetric processingImages are aligned, a dense point cloud and surface model are generated and tied to the GCPs, and accuracy is verified against independent checkpoints.
- QA and deliveryDeliverables are produced in your coordinate reference system (e.g. ITRF96 / TM zone) and file formats, and handed over with an accuracy report.
File formats
GeoTIFF, SHP, PDF
FAQs
Do ground control points need re-surveying every period?
No. Permanent control points are set up once and reused on every flight; any that get damaged are replaced.
What format are the reports in?
Period reports as PDF; data as GeoTIFF and SHP/DWG; visuals in presentation format on request.
How do we start without historical data?
The first flight becomes the baseline, and every following period is compared against it.
Services behind this deliverable
Monitoring and change detection
Construction and mine progress monitoring, cut-and-fill change, development, forest, coastline, erosion and landslide monitoring; time-series orthomosaics, 4D GIS and scheduled flights.
AI and geospatial analytics
AI-powered detection of objects, buildings, roads, vehicles and trees in drone and satellite imagery; land cover classification, change and damage analysis, solar panel and thermal anomaly detection.
Geospatial software and platforms
WebGIS, GIS dashboards, 3D GIS, digital twin platforms, drone data portals, point cloud and orthomosaic viewers, mobile GIS, APIs and cloud GIS development.
Related deliverables
Earthworks & volumes
Cut and fill volumes from the difference between existing ground and the design surface, with cross-sections, schedules and a checked and approved report.
PDF report, DWG sections, XLSXOrthomosaic
A georeferenced, distortion-corrected aerial image mosaic you can measure directly from.
GeoTIFF, ECW, JPEG 20003D terrain model
A 3D model of the ground and everything on it — surface model (DSM), bare-earth model (DTM), classified point cloud and textured mesh.
GeoTIFF (DSM/DTM), LAS/LAZ, OBJ, 3D Tiles