RECTIFIED PHOTOGRAPHY

What is Rectified Photography

Rectified Photography is a technique primarily used to record building facades and elevations, but is also used from above to record ground level features such as cracks or damage to floors. Rectified Photography involves digitally removing the distortion and perspective in a photograph to produce a scaled image of an object from which accurate measurements and interpretation can be made. Rectified Photography is particularly suitable for recording detailed features where surface texture is important for conservation or heritage projects.

How does it work

The surface of the facade or elevation is recorded photographically. Digital pictures are taken from a geo-referenced position using a Digital SLR camera fitted with a calibrated asymmetrical lens. This provides super wide angle shots minimising the number setups required and allowing photographs to be taken even where access is restricted. Images from the camera are processed using software together with control points observed onsite, to remove distortion and perspective and to locate the image three dimensionally so that a number of images can be stitched together to form a scaled montage of  large areas.

Our experience

Murphy Surveys have a lot of experience working in this field using a combination of the right technologies to meet project requirements including rectified photography and 3D Laser scanning. We can also deploy a portable telescopic mast to acquire elevated photography and capture elevated features, ground features and roof surfaces.

Benefits

• Calibrated asymmetrical lens provides super wide angle shots minimising the number setups required and allowing photographs to be taken even where access is restricted.
• Allows the capture of detailed building texture and fabric.
• Provides high quality photographic record.
• Cost effective. Only certain details of the elevation need to be drawn in CAD. Measurements can be taken as needed from the scaled image.
• Clearly records damage and areas requiring repair.
• Non subjective recording method.
• Dimensions can be taken directly from the principle plane of the photographic image.
• Provides valuable additional information and context to drawings.

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