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Geospatial Imaging

Specialist survey techniques, such as photogrammetry and laser scanning, are a fundamental component of any heritage project.

Often referred to as metric or measured survey, they provide visual and metrically accurate base data for a variety of heritage applications including conservation planning, condition surveys, decay monitoring, recording, architectural analysis, archaeological investigation and site presentation.

Here you can learn about the following apects of these methods:

 

Colour photograph of a man setting up a total station theodolite on a tripod in front of an old barn
Undertaking survey work at Harmondsworth Great Barn, Hillingdon, Greater London © Pat Payne © Historic England

Direct survey techniques

These are used where there is a need for specific survey information that requires data selection at the point of capture. They rely on the surveyor understanding the selection requirements of the project as well as the technical constraints on the technique.

They include hand survey as well theodolite/total station equipment that uses active, non-contact distance measurement technologies.

Colour photograph of a man using a total station theodolite with some ruined walls in the background
David Andrews using a Leica TS15i imaging total station theodolite to undertake survey work at Byland Abbey, North Yorkshire © Paul Bryan © Historic England

Indirect survey techniques

These are used where there is a need for mass data capture or when the size or extent of the subject is too large for direct techniques to be suitably deployed.

They are typically based on image capture, be it photographic or laser-based (to derive a point-cloud) and often require some post-processing in order to derive the required survey outputs.

They include rectified photography, photogrammetry, orthophotography and laser scanning. Further guidance on the use of such techniques can be found in '3D laser Scanning for Heritage'

Colour photograph of a man setting up a laser scanner with target on a tripod in the foreground and church in the background
Paul Bryan using the Faro Focus 3D to laser scan the structure at Harmondsworth Barn © Pat Payne © Historic England
3D Laser Scanning for Heritage

3D Laser Scanning for Heritage

Published 31 October 2011

2nd Edition. Advice and guidance to users on laser scanning in archaeology and architecture

Structure-from-Motion (SfM)

Examining Structure-from-Motion photogrammetry of artefacts from Rievaulx Abbey as a means of recording for the English Heritage Curatorial Team, Helmsley Archaeological Store Recent developments in multi-image photogrammetry and machine vision have led to increased use of Structure-from-Motion (SfM) across aerial, terrestrial and close-range applications. SfM allows three-dimensional structures to be derived from two-dimensional image sequences.

You can download some of these recent examples of applying SfM and laser scanning as Research Reports:

 

Colour image showing lots of blue rectangles around a pair of stone heads. Each rectangle denotes the position of the camera
Digital imagery captured with multiple overlap can be processed within Structure-from-Motion software, such as Agisoft Photoscan, to create a detailed three dimensional model © Paul Bryan © Historic England

Multi-light imaging

Reflectance Transformation Imaging (RTI) is an innovative multi-light imaging technique that utilises a pre-fabricated dome to produce an interactive output for revealing subtle surface relief. Further information about this technique can be found in our 'Multi-light Imaging for Heritage Applications' guidance publication.

Colour schematic showing a dome with a camera at the top and a series of angles running down the outside
The virtual lighting dome, centred around a virtual clock, as used to acquire imagery for Reflectance Transformation Imaging (RTI) © Drawn by John Vallender © Historic England
Multi-light Imaging for Heritage Applications

Multi-light Imaging for Heritage Applications

Published 6 March 2013

This publication provides practical guidance on reflectance transformation imaging (RTI) technique, and in particular, on the polynomial texture mapping (PTM) method for fitting reflectance distribution data.

Survey standards and specifications

Use of a defined survey standard allows:

  • An understanding of the project requirements by both client and end-user 
  • Accountability
  • Data consistency
  • Management of client expectation
  • A focus on what an end-user needs from a survey technology.

Colour photograph showing four people gathered around to look at a GPS receiver, with Kenilworth Castle in the background
Using a hand-held GNSS receiver to map the archaeological landcape around Kenilworth Castle, Warwickshire © Lucy Millson-Watkins © Historic England

Metric Survey Specifications for Cultural Heritage

To ensure metric survey data is both appropriate and 'fit for purpose', Historic England has developed a standard specification for metric survey

Now in its third edition this document includes all metric survey techniques that are currently applied across a range of heritage applications. This includes laser scanning, multi-image photogrammetry/Structure-from-Motion (SfM), the capture of low level aerial imagery using Small Unmanned Aircraft (SUA) and Building Information Modelling (BIM), that are all being increasingly applied across cultural heritage professions.

The title ‘Metric Survey Specifications for Cultural Heritage’ reflects a more generic approach to specification as now used by the Royal Institution of Chartered Surveyors (RICS).

There are further client guides available from The Survey Association.

Metric Survey Specifications for Cultural Heritage

Metric Survey Specifications for Cultural Heritage

Published 15 September 2015

A revised and updated third edition of specifications widely used by heritage professionals throughout the historic environment sector.

£50.00

Traversing the Past

Traversing the Past

Published 15 February 2016

This publication is one of a series on archaeological field survey techniques published by Historic England. It covers the electronic total station theodolite (TST) and its use in landscape archaeology.

Building Information Modelling (BIM)

BIM is a process of illustrating, in digital terms, all the elements that compose a building. It allows a project team to collaborate and create a single source of data that assists construction, estate & facilities management processes throughout the life-cycle of a building.

 

Screenshot of 3D model of a small wooden building with the menus ad toolbars from the program visible around the edges
Revit model for the Swiss Cottage at Osborne House, Isle of Wight. The creation of a BIM model allows the illustration, in digital terms, of all the elements that compose a building. © Historic England

Within Historic England an internal BIM Special Interest Group (BIMSIG) is considering the impact of BIM across heritage through the Heritage Science Strategy. Historic England commissioned consultants Ramboll to produce a report on the application of BIM for heritage science contexts.

We have also produced guidance on developing a BIM model for historic buildings.

BIM for Heritage

BIM for Heritage

Published 20 July 2017

This publication raises awareness of the potential advantages of a BIM approach to help users successfully implement BIM in heritage projects.

Paul Bryan

Paul Bryan

Geospatial Imaging Manager

Paul Bryan heads up the York-based Geospatial Imaging team that takes the corporate lead across Historic England on applying modern image and laser based survey approaches across heritage. Awarded Fellowship of the RICS in 2013 he has extensive knowledge of image based survey including photogrammetry, laser scanning, low-level aerial imaging using drones and is the Historic England lead on Building Information Modelling (BIM) for Heritage.

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