1,721,272 research outputs found
The Potentials of Large-Scale Open Access Remotely Sensed Ready Products: Use and Recommendations when Monitoring Urban Sprawl Near Cultural Heritage Sites
No full textRecent studies show how remote sensing data elaboration practices have been shifted from (pre and post) processing of a few number of satellite images, to the use of an extensive dataset. Ready calibrated and validated satellite products, have been populated lately in the literature, driven by the open access policy of space agencies such as those of the European Space Agency (ESA), advance image processing (e.g., deep learning and machine learning) and availability of big data cloud infrastructures.Nevertheless, this shift has not yet well-fitted with research questions and needs of a range of disciplines considered to be "application fields"from a geomatic and geospatial science perspective. In this paper we aim to showcase the challenges when using sophisticated collections such as Global Human Settlement Layer (GHSL) data for heritage applications. Cultural heritage domain relies on remote sensing information for purposes of mapping, monitoring and management and often requires tailored made considerations on the changing context that surrounds the single sites is presented. The paper gives some indications on use and recommendations when using this kind of data for monitoring urban sprawl near some cultural heritage sites in Cyprus
ENGINEER WP2 SS1 PhotogrammetryCloseRange NikonD780
No full textThis dataset was created during ENGINEER project activities and is accessible only upon user request and approval by the responsible national authority of Cyprus, namely the Department of Antiquities. The dataset pertains to close-range photogrammetry data acquired using a Nikon D780 camera
D4.7 (Conference papers/posters participation)
No full textThis deliverable (D4.7: Conference papers/posters participation) presents a detailed list of all
conferences where the MedSTACH project was presented, during Phase I, in order to
disseminate MedSTACH’s activities in the academic and industrial sectors. The list includes
presentations in international and local conferences and workshops. The presentation of
MedSTACH project and the Centre’s activities in the specific conferences served the
networking with key and relevant associations, stakeholders, private agencies,
archaeological missions, and universities at a local and international level
D4.6 (Mass media material)
No full textThis deliverable (D4.6: Mass media material) presents a detailed list of all the mass media
material pertaining to MedSTACH project outreach activities during phase I. The list, which is
described in detail in the following paragraphs, includes interviews by Consortium members,
newspaper and magazine articles, press releases, social media and website references to
the project and the proposed Centre of Excellence, its mission and vision and its expected
contribution to the socio-economic and scientific development of Cypriot society and the
wider eastern Mediterranean region.
The activities discussed below were primarily addressed towards the broader Cypriot society
in order to raise awareness within the country’s general public about the significant efforts
undertaken by MedSTACH for future-proofing the society’s development. As such most of
the material in the press and radio interviews were conducted in the Greek language and in
the national media avenues. However, promotion activities crossed the borders, primarily
through mass online media material (social media pages and MedSTACH dedicated website)
as well as publications (press releases and articles) in newspapers/magazines covering the
international members of the Consortium, namely Greece and the UK. Dissemination in two
languages – Greek and English – resulted in reaching a very wide audience
Recording of Historic Buildings and Monuments for FEA: Current Practices and Future Directions
Full text linkCultural heritage (CH) sites and monuments share significant historical and cultural value, but at the same time, these are highly vulnerable to deterioration due to age, construction methods, and materials used. Therefore, stability studies for CH structures through numerical analyses allow researchers and stakeholders to safeguard them against time and exposure to hazards. To obtain reliable results for stability studies, detailed and accurate geometric documentation is needed prior to any modeling or simulation. In this context, geomatics technologies like LiDAR and photogrammetry can offer great support in documenting their structural integrity, providing efficient, non-invasive data collection methods that generate 3D point clouds. Nevertheless, despite the benefits, geomatic methods remain underutilized in structural engineering due to limitations in converting 3D point clouds directly for use in finite element modeling (FEM) analysis. The paper aims to review current approaches for the generation of FE models for structural analysis employing data obtained from 3D digital surveys. Each approach is described in detail, providing examples from literature and highlighting its advantages and disadvantages. Studies show that analysis accuracy depends strongly on point cloud level of detail, underlining the importance of precise geomatic surveys. Emerging workflows and semi-automated methods enable point clouds to be integrated with BIM (building information modeling) and FEM, thereby enhancing the contribution that laser scanning techniques and 3D modeling provide for the analysis of the stability of structures belonging to cultural heritage
Satellite remote sensing and GIS-based multi-criteria analysis for flood hazard mapping
No full textThis work focuses on the exploitation of very high-resolution (VHR) satellite imagery coupled with multi-criteria analysis (MCA) to produce flood hazard maps. The methodology was tested over a portion of the Yialias river watershed basin (Nicosia, Cyprus). The MCA methodology was performed selecting five flood-conditioning factors: slope, distance to channels, drainage texture, geology and land cover. Among MCA methods, the analytic hierarchy process technique was chosen to derive the weight of each criterion in the computation of the flood hazard index (FHI). The required information layers were obtained by processing a VHR GeoEye-1 image and a digital elevation model. The satellite image was classified using an object-based technique to extract land use/cover data, while GIS geoprocessing of the DEM provided slope, stream network and drainage texture data. Using the FHI, the study area was finally classified into seven hazard categories ranging from very low to very high in order to generate an easily readable map. The hazard seems to be severe, in particular, in some urban areas, where extensive anthropogenic interventions can be observed. This work confirms the benefits of using remote sensing data coupled with MCA approach to provide fast and cost-effective information concerning the hazard assessment, especially when reliable data are not available
Low-cost photogrammetry solutions for surveying confined underground spaces: testing the traditional set-up against 360° camera on Tombs of the Kings archaeological site
Full text linkThis study explores low-cost photogrammetry solutions for surveying confined underground spaces, focusing on Tomb 7 at the UNESCO World Heritage Site, Tombs of the Kings in Paphos, Cyprus. The research, part of the ENGINEER project, compares traditional photogrammetric methods using frame cameras against a 360° multi-lens camera. The aim is to identify reliable, low-cost methods for 3D documentation of archaeological sites, which can be used for structural analysis and systematic monitoring.Three photogrammetric acquisition methodologies were tested: handheld with frame camera, standard with frame camera, and relaxed with 360° camera. The study evaluates the accuracy of these acquisition methods by comparing dense point clouds generated from each dataset against a reference dataset obtained via terrestrial laser scanning (TLS). Metrics such as cloud-to-cloud distance, roughness, and point cloud density were used for comparison.Results indicate that while the 360° camera offers ease of use and high data density, it also introduces more noise and variability. Traditional methods, though more time-consuming, provide more consistent and accurate results. The findings suggest that combining both approaches could optimize data quality and acquisition efficiency, making the 360° multi-lens camera a viable low-cost photogrammetry option for heritage documentation
Μελέτης έντασης του φαινομένου αστικής θερμικής νησίδας στην Αστική περιοχή της Λεμεσού
No full textChanges of land surface in cities affect the storage and radiative transfer of heat and its partitioning into sensible and latent components. Thus air temperature values in areas of high building density are usually higher than those of the surrounding rural country. This, phenomenon, referred an Urban Heat Island and is the most validated phenomenon of climatic change, consisted the strongest feature of urbanization. The highest air temperature difference between urban and rural areas defines the urban heat island intensity. Elevation of air temperature increases the building cooling energy demand, which results in higher pollution emissions. The opposite effect of lower air temperature of the urban central areas or the so called Urban Cool Island. The research examines the spatial formation of the daytime Surface Urban Heat Island effect of Limassol City Cyprus, as case study of cities in semi – tropical climates. Two satellite images acquired by Landsat 5 from July and August , 2000 and 20002 (night shot and day shot), are used to retrieve Land Surface Temperature, identify Land Use/Land Cover classes and investigate the spatial variation of Land Surface Temperature and the Surface Urban Heat Island intensity. The results indicate than densely built- up areas , such as central districts of the city and green areas , had lower Land Surface Temperature as cool islands, compared to the non – urbanized area around the city during the daytime. In contrast, open spaces and new low – density housing developments on the outskirts of the city, experienced higher Land Surface Temperature and showed an surface urban heat island effect during the daytime. The results show that during the daytime residential areas in the city Centre recorded an Land Surface Temperature of 44 +-3 during the daytime and 21 +-3 during the nighttime. Urban Heat Island Intensity of the city ranged from 1.5 to 2.5 compared to a 15km buffer zone around the city.Αλλαγές στην επιφάνειας της γης με συνεπακόλουθο την αύξηση της θερμοκρασίας του αέρα και των επιφανειών στο εσωτερικό των πόλεων σε σχέση με τις αντίστοιχες θερμοκρασίες στα περίχωρα προκαλούν σοβαρά προβλήματα στο ενεργειακό ισοζύγιο της πόλης. Ο ατμοσφαιρικός αέρα που παγιδεύεται στο εσωτερικό της αστικής περιοχής μέχρι και το επίπεδο των κτιρίων προκαλεί έντονη θερμοκρασιακή διαφορά μεταξύ των περιχώρων. Το φαινόμενο αυτό, γνωστό ως Αστική Θερμική Νησίδα (Α.Θ.Ν), είναι κλιματικό φαινόμενο και αποτελεί κυρίαρχο γνώρισμα του αστικού μικροκλίματος. Ως ένταση του φαινομένου Α.Θ.Ν ορίζεται η μεγαλύτερη διαφορά θερμοκρασίας του αέρα μεταξύ αστικών και ημιαστικών περιοχών. Η αύξησης των τιμών θερμοκρασίας του αέρα οδηγεί στην περαιτέρω ζήτηση για ψύξη των κτιρίων και κατ ΄ επέκταση στην αύξηση της των εκπομπών ρύπων. Οι χαμηλές τιμές θερμοκρασίας οδηγούν στο αντίθετο φαινόμενο το οποίο καλείται Ψυχρή Αστική Νησίδα (Ψ.Α.Ν). Η ερευνητική μελέτη εξετάζει την χωρική μεταβολή της θερμοκρασίας και παρατηρεί τη ένταση του φαινομένου Θ.Α.Ν μέσω δορυφορικών εικόνων τύπου Landsat 5 για το έτος 2000 και 2002 από τις οποίες ανακτήθηκαν θερμοκρασιακά δεδομένα. Τα αποτελέσματα δείχνουν ότι οι πυκνοκατοικημένες περιοχές και περιοχές με χώρους πρασίνου παρουσιάζουν μειωμένες τιμές θερμοκρασίας, χαρακτηρίζοντας τις σαν ψυχρές περιοχές, και οι ανοικτοί χώροι αυξημένες τιμές θερμοκρασίας κατά την διάρκεια της ημέρας. κατά την διάρκεια της ημέρας η επιφανειακή θερμοκρασία στην αστική περιοχή μελέτης κυμαίνεται στους 44+-3 C° και κατά την διάρκεια της νύχτας στους 21+-3 C°. Τέλος, η ένταση του φαινομένου κυμαίνεται στου 1,5 – 2,5 C° σε περιφέρεια 15 km από την περιοχή μελέτης.ΜΕΛΕΤΗΣ ΕΝΤΑΣΗΣ ΤΟΥ ΦΑΙΝΟΜΕΝΟΥ ΑΣΤΙΚΗΣ ΘΕΡΜΙΚΗΣ ΝΗΣΙΔΑΣ ΣΤΗΝ ΑΣΤΙΚΗ ΠΕΡΙΟΧΗ ΤΗΣ ΛΕΜΕΣΟΥComplete
Orthogonal equations for the detection of hidden archaeological remains de-mystified
No full textAbstractSpectral variations of vegetation, known as crop marks, have been widely used for archaeological research as a proxy to detect buried archaeological remains. Such marks can be recognized using space-borne data and image analysis techniques supported by the existing archaeological knowledge of the area under study. Orthogonal equations for the enhancement and detection of crop marks using multispectral satellite images have been recently proposed in the literature. The proposed equations are linear transformations of the initial spectral bands of multispectral datasets aiming to the improvement of the satellite images. For the calculation of the n-space coefficients of this linear transformation a four-step methodology was followed, separately for each sensor. This paper aims to provide the fundamental concept of the development of these equations as well as some aspects related with the application and accuracy assessment. Spectral characteristics of the sensor, atmospheric effects, and spectral calibration of the datasets as well as the selection of the appropriate period for applying these equations for the enhancements of crop marks are also discussed. Such orthogonal equations may be further developed and applied for any kind of sensor either hyperspectral or multispectral for the detection of buried archaeological remains. An example of the applicability of the orthogonal equations at Stonehenge archaeological site is also demonstrated
Investigation of spectroscopy remote sensing for mapping pavement systems condition
No full textAn investigation of spectroscopy remote sensing for mapping pavement systems conditions is undertaken in this research. Spectral data were acquired by the HR1024 spectroradiometer and were analysed, processed and interpreted. A spectral library was developed in order to define the attributes of the different pavement systems. This research has plot the spectral profiles of each pavement system that are investigated and found that the older roads have high reflectance and the areas with the deformations or cracks can be identified as they have lower reflectance than the un-cracked – healthy areas. Several t – test were applied followed the spectral profiles in order to indicate whether there is a difference in the means between the pavement systems. After the t – test, Pearson correlation coefficient and Euclidean distance were used in order to observe wavelengths that are going to be used in the spectral experiment. Through the spectral experiment these wavelengths were used in a try to identify cracked areas or deformations. The results of the spectral experiment have shown that the cracked areas or deformations are not visible in the wavelengths.Complete
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