Digital visualisation

To plan and illustrate refurbishment and reconstruction projects for the conservation of historic monuments, visualisation is an important aid for decision making. Depending on the respective tasks different procedures might be used.

In the simplest case different drafts can be visualised by montages, overlays and colour variants in the rectified photomap.

For the reconstruction of lost building parts or entire buildings a visualisation in the present environment is advantageous. For this purpose historical pictures can be used, by which the camera position will be photogrammetrically calculated. The historical building view is inserted into a photograph of the current situation taken from the calculated view point.

For complex tasks of visualisation it is advisable to produce a 3D photo model. Using existing plans, local geodetic measurements and the photogrammetric evaluations a true-to-scale 3D-CAD model is constructed. The level of detail used for the model depends on the task. Image information for the photorealistic model derives from existing image plans. Where necessary historic photographs are added. The true-to-scale 3D photo model is further used miscellaneously: as-built documentation, development of information systems, photo-realistic views, animated tours and films for presentations. Additionally, views of the 3D photo model with selected lines of sight can be computed and inserted into photographs of the current situation. The 3D photo model can show both the historic condition and the current status of planning.

Reference projects:
2006
Hundisburg
Castle, Great Hall 
2005
Leipzig
Memorial for Felix Mendelssohn  
2004
Uetz
Schwedenhäuschen, historic log house 
2003
Berlin
Berlin State Museums, Museum of the Ancient Near East, Ishtar-Gate 
2000
Potsdam
coronation coach of Friedrich Wilhelm II. 
1999
Bad Muskau
bridge at Pückler's Park 
1998
Halberstadt
Ratslaube, historic town hall 
1997
Berlin
Unter den Linden 1, former commandant´s office 
1996
Potsdam
Marble Palace 

Digital image plans

Digital rectified images represent a cost-effective alternative to CAD-plans. The result of the rectification is a true-to-scale photomap with exact geometry for CAD evaluation as well as true-to-scale mapping.
For the comprehensive documentation of facades with several planes the individual planes are separately rectified on the base of reference points that were measured by tacheometer and combined afterwards digitally to a true-to-scale photomap. If the surfaces are very irregular or curved an orthogonal projection is calculated with a digital surface model (3D laser scanning) onto a plane or a cylinder.
We use a full-frame SLR-camera (7300 x 4900 px) and focal lengths from 12 to 800 mm. for special applications. Correction parameters are calculated for distortion and chromatic aberration for all lenses.

Reference projects:
2015
Memleben
2015
Hannover
2015
Wernikow
2015
Berlin
2014
Leipzig
2014/2015
Goslar
2014
Bielefeld
2013
Weißenburg
castle 
2013
Bayreuth
2012
Frankfurt/Main
2012
Berlin
2012
Tübingen
2012
Baden-Baden
2011
Quedlinburg
2011
Bönnigheim
2011
Mücheln/Wettin
2010
Stockholm (S)
2010
Stockholm (S)
2010
Freyenstein
2010
Blankenburg
2009
Zwickau
2009
Kietz
2009
Minden
2009
Deisel
2009
Stuttgart
2009
Halle (Saale)
2009
Frankfurt am Main
2009
Blankenburg
2009
Wiesbaden
2008
Burg
2007-2008
Hildesheim
2006, 2008
Quedlinburg
2006
Erfurt
2006
Baden-Baden
2006
Halberstadt
2005
Eyershausen
2005
Greiz
2005
Leipzig
2004
Mannheim
2004
Wechselburg
2003
Blankenburg
2003
Einbeck
2002
Ilsenburg
2002
Mühlhausen
2001
Tangermünde
2001
Bremen
2001
Arnstadt
2000
Rheda-Wiedenbrück
2000
Walbeck
1999
Sondershausen
1999
Plötzkau
seit 1998
Leipzig
1997
Maisdorf
1997
Kyffhäuser
1996
Freyburg
seit 1995
Aschersleben

Recording historic interiors

Large scale image plans are created in photographic quality to record the paint and decoration of rooms. The result combines the photographic record of the present condition with exact geometry. The compilation of image overviews room by room facilitates the work of the people involved in the project.

For the coherent representation of walls, ceilings and floors, the images are rectified projectively based on coordinates and mounted to an image plan using control points measured by total station.
Depending on the object geometry, image plans are produced using 2D-image rectification or the true-to-scale development of surfaces.
Based on a digital surface model (3D laser scanning) structured or multi-curved surfaces (domes, cross vaults) are ortho-projected onto planes or surfaces of cylinders and cones.

Reference projects:
2016
Rheinsberg
2015
Stockholm (S)
2015
Potsdam
2014
Rheinsberg
2013
Heidelberg
2013
Salem
2012
Bad Mergentheim
2011
Raitenhaslach
2011
Ettlingen
2010
Mannheim
2009
Wiesbaden
2009
Kyffhäuser
2009
Corvey
Palace, Knights' Hall 
2008
Paretz
2008
Samarkand (UZ)
2006
Altenburg
2005
Memleben
2005
Dresden
2004
Zeitz
2004
Erfurt
2002
Linderhof
2002
Sondershausen
2001-2003
Neuburg a. d. Donau
2001
Leipzig
2000
Hecklingen
2000
Ampfurth
2000
Halberstadt
1999
Kyffhäuser
1999
Potsdam
1998
Güstrow
1997
Branchewinda
seit 1997
Neuburg a.d. Donau
1994
Suhl-Heinrichs

Documentation of wall paintings

To document the conservation images in the scales 1:10 and higher photographic quality are created. The result combines the photographic record of the condition with precise geometry. For the coherent representation of large wall surfaces, the images are rectified projectivly on a coordinate reference and mounted to an image plan using control points measured by total station.
Depending on the object geometry, image plans are produced using 2D-image rectification for plane walls or by projection of apses, vaults and arches onto a developable cylinder or cone surface.
Heavily deformed walls or multiple curved surfaces (cross vaults) an orthogonal projection based on a digital surface model (3D-Laserscan) is calculated onto a plane or cylinder.

Reference projects:

Documentation of floors

Digitally rectified images are a cost-effective alternative to CAD-plans. The result of the rectification is a true-to-scale photomap, which combines the photographic record of the present condition with accurate geometry information of the object.
To support conservators, to assemble inventories of museums and collections, to document, digital photoplans at scales of 1:25, 1:10 or larger are provided at high photographic quality and merged to a true-to-scale record.

Reference projects:

Digital processing and projection of curved surfaces

The curved surfaces (e.g. of towers, apses and vaults) can be developed true-to-scale to the plane. Objects with more than one curvature or a strong deformation (e.g. cupola, apses) are projected on a medium cylinder. In both cases the geodetic measurement of control points, profile lines and further object information are carried out parallel to the photogrammetric image capture. The unrolled detail images are mounted to a true-to-scale photoplan, which can be used for documentation purposes or as mapping basis. The surfaces are digitally developed with the software metigo® 3D.

Reference projects:
2012
Dresden
2011
Raitenhaslach
2011
Ettlingen
2008
Rastatt
2008
Potsdam
2007
Lerum (S)
2006
Dresden
2004
Banz
2002
Linderhof
2001
Sondershausen
1999
Zeitz
1997
Burgkemnitz
1996
Halberstadt

Photogrammetric evaluations of historic photographs

Conserving historic buildings, the true-to-scale reconstruction of lost details or destroyed building parts based on historic images might be of interest. If there are only a few images available 2D-planes can be reconstructed and evaluated metrically. However, if more images captured from several positions are available these can be photogrammetrically evaluated in 3 dimensions. The workflow described at the prospectus does not depend on the kind and size of the objects (cornice profile, chandeliers, floors, walls, building parts).

Reference projects:
2016
Görlitz
2015
Halle
2015
Dresden
2014
Leipzig
2012
Dresden
2012
Potsdam
Picture gallery, Picture Frames 
2011
Halle/Saale
2011
Rötha/Sachsen
2011
Rheinsberg
2009
Halle
2009
Dresden
2008
Potsdam
2006
Kollberg
2005
Hundisburg
2004
Hundisburg
2001
Offenbach
2001
Eichwalde
2001
Potsdam
2000
Leipzig
2000
Berlin
1999
Bad Muskau
1999
Bernburg
1999
Köthen
1998
Halberstadt
1997
Kemberg
1996
Roitzsch

Documentation of artworks

Preparing the conservation of artwork, supporting its investigation and recording finally the conservation measures photographic images captured within various spectral ranges are required. In addition to digital image planes up to 1:1 scale superimposed image plans are created from grazing light and macro shots, UV-reflectography, UV-fluorescence, IR-reflectography and X-rays as well as historic images (also delivered by our clients).

For the work on site a digital medium format camera (Phase One) as well as specially modified cameras or digital camera backs for IR and UV images in conjunction with various filters are used.
If required radiographs can be captured using a mobile X-ray unit on the customer's site in cooperation with photographer Asmus Steuerlein. For lightning we use special daylight spots (cold light) for digital photography as well as a professional flash-gun camera and UV-radiators.

The images are processed within a comprehensive colour management process starting with grey and colour reference during image capture, the RAW-develoment at colour-calibrated workstations to the printout with non-ageing ink on baryta paper for long-term archiving.

Before starting work, the radiometric distortion and chromatic aberration of the images are corrected. Matching algorithms with sub-pixel accuracy guarantee exact rectification and montage of the detailed shots to an overall image with high photographic resolution and without any interferences.

Reference projects:
2015
Eisleben
St. Andrew's Church, Luther pulpit 
2015
Dresden
Castle, supraportes of the Parade Rooms 
2015
Neustadt an der Orla
Church of St. Johann, Cranach altar 
2014
Halle
Market Church of Our Dear Lady, reredos (Cranach workshop) 
2012
Maulbronn
2010
Wandersleben
2010
Stockholm (S)
2008
Stockholm (S)
2008
Arnstadt
Church of Our Lady, main altar 
2006
Uthleben
village church, altar 
2006
Leipzig
University, panel by Werner Tübke 
2004
Weißensee
Church of St Peter and St Paul, high altar 
2003
Neuenhof
village church, altar 
2003
Freiberg
Cathedral of St Mary, musical instruments 
2003
München
Theatine Church, altars 
2003
München
Holy Cross Church, altars 
2001
Weimar
Town Castle, panel painting of Wilhelm Tell 
2001
Kade
village church, altar, panel paintings 
1999
Pferdingsleben
St Wigbert Church, altar, panel painting 
1994
St Magdalene, panel painting (private property) 
1993-1998
Bibra
St. Leo Church, Annunciation Altar 
1993
Meißen
St Martin's Chapel, panel painting of Christ 

Facade plots and stereo documentation

Large sized stereo images form the basis for the production of true-to-scale drawings of facades, walls and ceilings as well as of single objects. Parallel to stereo image capture, the geometry and condition of very complex objects are surveyed with a totalstation in reflectorless mode. The images are graphically evaluated at the PC using the software metigo® MAP. Regarding to accuracy and completeness the stereo-photogrammetric evaluation corresponds to a deformation-true metric survey. This procedure is particulary suitable for the representation of heavily decorated and structured objects. Curved surfaces can be developed to equivalent and equidistant projections. Further sections, e.g. to complete metrically surveyed plans, can be derived.

Reference projects:
2016
Gnandstein
2015
Berlin
2012
Ochsenhausen
2012
Salzwedel
Old Town Hall 
2012-2014
Gnandstein
Castle, Manor, bake house, orangery 
2009
Berlin
Brechthaus at Chausseestraße, home of Bertolt Brecht 
2009
Stuttgart
2009
Frankfurt am Main
2008
Paderborn
Haxthausenhhof 
2007
Bernburg-Aderstedt
2006
Erfurt
Church of St. Severius, font 
2005
Halle (Saale)
Red Tower 
2004
Quedlinburg
Collegiate Church 
2004
Kassel
Kasseler Bank, credit union 
2003
Halle (Saale)
Market Church of St. Mary, aisle 
2003
Einbeck
Market Church of St James 
2002
Hadmersleben
Collegiate Church of St. Peter and Paul 
2001
München
Innere Wiener Straße 44, domestic house 
2001
Hamersleben
Collegiate Church of St. Pankratius, choir east view, north tower 
2001
Goseck
Castle 
1999
Sondershausen
Castle 
1999
Hamm
St. Paul´s Church 
1999
Chemnitz
District Court 
1997
Rostock
former St Catherine's Collegiate 
1994
Markkleeberg
Rathausstraße 

Demolition documentation

Subject to listing and grading of the object and the consent given by the local monuments authority an approbriate documentation to the object is offered. In accordance to the conservation measures this can comprise a simple photographic record, the stereo documentation with a photogrammetric camera for evaluation at a later date as well as the deformation-true totalstaion survey at various accuracy levels, digital image plans at various scales, graphic facade plots and a stereo-photogrammetric evaluation.

Reference projects:
2005
Halle
2003
Halle
2002 & 2004
Aschersleben
2002
Peitz
1999
Schönwölkau
1999
Weißenfels
1996
Halle
1995
Halle
1993
Pouch
seit 1993
Leipzig, Halle, Eilenburg,
Aschersleben, Naumburg,
Wurzen, Grimma, Delitzsch