We use the latest medium format and DSLR cameras, high quality lens, masts, drones and software to produce high resolution photography. This can simply be as a record of an existing site or developed into rectified and orthographic photography or 3D textured models.
Rectified photography provides scaled accurate photographic elevations of a building. This is ideal when, for example, recording a complex historic brick-built building – as all the bricks are shown on an elevation there is no need to draw each one. It saves a great deal of time, shows a vast amount of detail and individual bricks can be clearly marked up by an architect or surveyor to show areas for repair or repointing. These photographic elevations are much easier to read, by a wider range of users, than linework drawing. They are also very good for interpretation as they use photographs to show what the building looks like. This technique does have some limitations as the images are only usually scaled on one or two main planes and may need unwrapping for curved structures.
Photogrammetry provides measurements from photographs and means that accurate scaled photographic elevations of a building or monument can be provided. Photogrammetry is particularly useful for stone-by-stone records and drawings due to the quality and accuracy of the image. For very complex structures, photogrammetry is a more suitable technique than rectified photography.
Ortho imagery provides the greatest level of accuracy in photographic surveys as all of the elements are shown true to scale. This technique requires a combination of a large number of high resolution photographs and laser scanning, processed into a completely true-to-scale image. It provides a highly accurate, scaled and detailed photographic record, is an impressive interpretation tool and can be used to mark up or inform complex repairs to a site. Photography is often combined from a number of sources including drones, access platforms, camera masts and from the ground.
3D Textured Models
A 3D textured model is a combination of photography and laser scanning. These are often merged together to produce an enhanced point cloud or mesh model. This can be used as a record, to inform repair and development proposals and in interpretation. They can be combined into BIM models to provide accurate representations of sculpture or more decorative, less repetitive detail that would be too costly or time consuming to model directly.
High quality photographs of a building’s interior and exterior can be required both before and after changes are made. The before images provide an accurate record of the condition and appearance of a place before (sometimes major) changes are carried out, and after images show the impact of those changes. We have carried out records such as this on many sites for a range of owners including the National Trust.
A drone survey can be the safest and most cost-effective way of surveying inaccessible areas of a building or site, such as high-level roofs. We used a drone to survey hard to access areas of the Orangery at Cliveden Park, for example. We are fully aware of the constraints associated with safely flying drones, particularly in urban areas, and can comply with these issues.