Photogrammetry

The photogrammetric orthomosaic combines overlapping photographs into a detailed, map-aligned image with a consistent scale. It gives project teams a current visual base that can be measured, annotated and compared with other spatial information. GeoTIFF supports accurate use in GIS and CAD-linked workflows, while JPEG offers a lighter review copy for reports, meetings and communication with users who do not need specialist mapping software.

A dense point cloud reconstructs the visible site geometry from matched locations across many overlapping photographs. Each point has a three-dimensional position and usually colour from the source imagery, creating a detailed digital record for inspection and measurement. LAS or compressed LAZ files can be filtered and analysed in point-cloud software to support surface creation, volume work, feature review and preparation of further engineering products.

Elevation surfaces convert the reconstructed survey into continuous height models. A DSM represents the visible upper surface, including structures and vegetation, while a DTM represents the terrain where ground information can be reliably prepared. These products support contour generation, slope and drainage review, earthwork planning and comparison between survey dates. They are delivered with the coordinate reference and resolution needed for the agreed use.

A three-dimensional model joins the reconstructed survey points into a continuous surface and can apply the captured photographs as realistic texture. It provides an intuitive way to inspect complex sites, stockpiles, structures or heritage features from multiple viewpoints. The model supports visual coordination and suitable measurements, while giving teams a detailed condition record that can be revisited without needing everyone to be present on site.

Measurement outputs extract agreed quantities or dimensions from the verified photogrammetric model. They may include surface area, stockpile volume, excavation comparison, height, distance or terrain profiles, depending on the survey purpose and visible data. Results are supplied with their measurement basis and relevant limitations so project teams can understand what was calculated, review the supporting geometry and use the figures appropriately in their own workflow.

Engineering layers translate selected information from the photogrammetric survey into familiar CAD and GIS features. They can include contours, boundaries, visible structures, breaklines or other agreed mapping themes. DXF and SHP formats help design and spatial teams integrate the results without handling the full image model. Layer naming, coordinate reference and feature treatment are documented so the information remains clear when shared across disciplines.