Rectified photography
Rectified photography or ortho-rectified photography is the creation of accurately dimensioned images. I am privileged to have applied these skills in some amazing places; Tower of London, Hampton Court Palace, Kensington Gardens and numerous churches and monuments around the country. I have invested heavily over the years in drones, cameras, lenses and software to provide high quality imagery.
The Process
There are several methods to create these scaled and corrected images. For a large facade the best process would involve taking a series of images and using software to stitch these together, then applying coordinated points to these images to make them to scale. This process can also be used with aerial photography to provide a scaled image of a site.
All photography projects are in accordance with Historic England specifications/guidelines.
Projects
Tower of London – Rectified/Ortho imagery: Rectified photography was required of several moat walls and one large tall facade. A combination of ground level, high level using a mast and roof photographs were taken and processed. A control network was established to provide coordinates for the image rectification. Data was supplied to Historic Royal Palaces.
ACS Hillingdon: This was part of a measured survey of three heritage rooms within the College Mansion, photogrammetry was used to record the ceilings and the internal walls. From this, detailed CAD drawings were provided of the internal walls and reflected ceiling plans, the imagery was included as part of the final deliverable. See below for some examples >>
Laughton Place – Ortho rectified imagery: Ortho-rectified photography was required of this moated brick tower, this is all that remains of the larger house built in 1534 for which the tower served as an outlook post. It’s in a very remote location and the only challenge to get there was to avoid the many sheep! Photography was captured with drone and dslr, control was handled by total station. Deliverable was to the Landmark Trust. See below for examples >>
The Albert Memorial – Ortho rectified imagery: To date this is probably one of the most impressive structures we’ve had to photography, thousands of images mainly captured by drone in the magnificent Kensington Gardens. Ortho-rectified images were provided along with CAD drawings. Fully controlled by total station and delivered to Purcell and the Royal Parks. See below for examples >>
External rectified image examples
The Albert Memorial – Kensington Gardens
Churches
Laughton Place
Internal rectified image examples
Feedback
Thank you for the survey, the drawings and particularly the photographic flattened plans and elevations look very impressive.
The photography of the Albert Memorial was perfect for the use of us completing our condition survey.
FAQ
Orthorectification is the process of removing the effects of image perspective and slope to create a planimetrically correct image. The resultant orthorectified image has a constant scale wherein features are represented in their ‘true’ positions. This allows for the accurate direct measurement of distances, angles, and areas.
This is a great way to record in high detail a facade of a building, monument, church or perhaps a roof, ceiling, internal walls or a floor. The corrected images can be inserted into a CAD package using it’s world coordinates. For example you may have a large historic facade and want to inspect and record any defects, the image can be placed into CAD and any notes added over the image. Perhaps a large area of historic floor, paving or even a roof, the same process can be applied.
It’s often referred to as rectified photography, orthophotography, orthorectification and orthomosaic imagery.
If you require any further information or have a project in mind, please do not hesitate to get in touch…
I am passionate about photography, if you have time please take a look at my photography website which has more examples and drone imagery… www.ispypixel.co.uk