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| Titel |
Integration of thermal and hyperspectral VNIR imagery for architectural and artistic heritage analysis and monitoring |
| VerfasserIn |
Rosa Maria Cavalli, Nicola Masini, Simone Pascucci, Angelo Palombo, Stefano Pignatti |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250035875
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| Zusammenfassung |
| The application of integrated hyperspectral VNIR and thermal data for analyzing and
monitoring the architectural and artistic heritage status is becoming a remarkable tool to be
combined with other non-destructive techniques (e.g. GPR), and prior to destructive
checking, in order to extract appropriate information and make useful decisions
[1].
As the analysis of some kind of damages (e.g. water infiltrations) or alterations is not
always fulfilled with visible and thermographic imagery, the proposed study aims at
integrating hyperspectral reflectances and temperature and apparent thermal inertia
behaviours. Hyperspectral data is able to discriminate materials on the basis of their different
patterns of wavelength-specific absorption; in fact, they are successfully used for identifying
minerals and rocks, as well as detecting soil properties including moisture, organic
content and salinity [2]. Moreover, the potential to find out alterations or damages and
monitoring them through non-destructive sensors is particularly appreciated in
structural analysis for restoration works such as water infiltrations in outdoor cultural
assets and moisture penetration in a wall that is a major source of paint alteration [3,
4].
The jointly use of the reflective and infrared (emitted, absorbed, reflected and transmitted)
radiation for this research study is encouraged by the technical and operative characteristics
of the observation systems at disposal that can provide high spectral resolution and
high-frequency images with low NeÎR e NeÎT values and able to observe the
variables and physical and optical parameters in quasi real-time and connected to
the cultural heritage status. The following portable field instruments are used for
this study: (a) HYSPEX hyperspectral scanner working in the VNIR (0.4-1.0μm)
spectral region, which is an imaging spectrometer with a very high spectral and spatial
resolution, (b) 2 FLIR SC7000 Thermal cams working in the MWIR (3-5 micron) and
LWIR (8-12 micron) spectral regions provided with a portafilter and specific spectral
filters, and (c) ASD-FieldSpec FR Pro spectroradiometer, a portable hyperspectral
device operating in the 350-2500 nm spectral range (see characteristics in Table
1).
This paper shows the preliminary results after using visible near infrared hyperspectral
and thermal infrared integrated imagery for detecting and monitoring the conservation status
of some examples of Italian architectural and artistic heritage. The integration of the in situ
thermographic imagery with the hyperspectral scanner imagery allowed us to increase the
knowledge of alterations in the examined structures, e.g. invisible moisture shapes due to
water infiltration and processes of detachment.
The proposed monitoring approach can be also useful to individuate suitable parameters
which will allow a continuous and/or remote control of the condition of architectural and
artistic heritage to plan appropriate interventions for their conservation.
Spectral RegionSpectral Resolution Spectral RangeIFOV
Hyspex VNIR-1600VIS-NIR 3.7nm 0.4÷1.0μm 0.75 mrad
FLIR SC7900-VL MWIR integrated 3.5÷5.0μm 1.2 mrad
FLIR SC7000 LWIR integrated 7.7÷11.5μm 2.4 mrad
FieldSpec FR-Pro VIS-NIR-SWIR 3 nm @ 700 nm
10 nm @ 1500 and @2100
nm 0.35÷2.50μm 1÷25 degree
Table 1. Characteristics of sensors used for the study.
1 References
Moropoulo, A., Avdelidis, N., Koui, M., Delegou, E., Tsiourva, T., 2001.
Infrared thermographic assessment of materials and techniques for the protection
of cultural heritage. Multispectral and Hyperspectral Image Acquisition and
Processing, SPIE Vol. 4548. pp 313-318
Bassani, C. R. M. Cavalli, R. Goffredo, A. Palombo, S. Pascucci, S. Pignatti
2009. “Specific spectral bands for different land cover contexts to improve the
efficiency of remote sensing archaeological prospection: the Arpi case study”.
Special Issue of Journal of Cultural Heritage, Volume 10 (S1), pp. 41-48..
Morineau, A., and Stefanaggi, M., 1995. A statistical approach to the problem of
frescos: the French experience. J. Ital. Statist. Soc., 1: 37-53.
M. Danese, U. Demšar, N. Masini, M. Charlton 2009. Investigating material
decay of historic buildings using Visual Analytics with multi-temporal infrared
thermographic data, Archaeometry. |
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