“Involuntary Photogrammetry”: rescuing 3D geometric information from library pictures

[ES] En la actualidad la fotogrametría digital se ha consolidado como una de las técnicas más eficientes para la documentación del Patrimonio. La generación de modelos tridimensionales a partir de imágenes realizadas con cámaras fotográficas digitales es el procedimiento habitual. Es objeto de este artículo mostrar los resultados obtenidos con el estudio y análisis fotogramétrico de imágenes de archivo, tomadas principalmente en excavaciones arqueológicas, para recuperar la información tridimensional que pueda estar latente en ellas, aunque las capturas no hubieran sido realizadas con el propósito de crear modelos 3D. De esta forma hemos generado modelos tridimensionales en los que se pueden recuperar datos geométricos que no quedaron reflejados en los dibujos o fotografías realizados en campo.[EN] Nowadays digital photogrammetry has become one of the most efficient techniques for Heritage documentation. The creation of three-dimensional models from images taken with digital cameras is the usual procedure. The aim of this paper is showing the results obtained by photogrammetric analysis of library pictures, taken mainly in archaeological excavations, to recover three-dimensional information that maybe latent, although the shots had not been made with the purpose of creating 3D models. In this way we have generated three-dimensional models in which can be recovered geometric data that were not reflected in the drawings or photographs made during fieldwork.Aparicio Resco, P.; Carmona Barrero, JD.; Fernández Díaz, M.; Martín Serrano, PM. (2014). “Fotogrametría Involuntaria”: rescatando información geométrica en 3D de fotografías de archivo. Virtual Archaeology Review. 5(10):11-20. https://doi.org/10.4995/var.2014.4205OJS1120510ALMAGRO GORBEA, A. (1988): "La representación de la arquitectura a través de la fotogrametría: posibilidades y limitaciones", Fotogrametría y representación de la Arquitectura, "X Symposium Internacional del Comité Internacional de Fotogrametría Arquitectónica CIPA", Granada, pp. 81-90.ANGULO FORNOS, R. (2013): "La fotogrametría digital: una herramienta para la recuperación de arquitecturas perdidas. Torre del homenaje del Castillo de Constantina" En Virtual Archaeology Review, Volumen 4, número 8, pp. 140-144.ÁVIDO, D., VITORES, M.: "El archivo fotográfico como fuente para la reconstrucción tridimensional". Póster presentado en V Congreso Nacional de Arqueometría. UTN-Rosario (Argentina). [URL: http://goo.gl/3PrFX0]. Acceso el 19/01/2014.BINFORD, L. R. (1971): "Mortuary practices: their study and their potential". Memoirs of the Society for American Archaeology, pp. 6-29.BUILL, F., NÚÑEZ, M. A., RODRÍGUEZ, J. J. (2007): Fotogrametría arquitectónica. Ediciones UPC, Barcelona.CABALLERO, L.; ARCE, F., FEIJOO, S. (1996): "Fotogrametría y el análisis arqueológico", Revista de Arqueología, nº 186, pp. 14-25.CASTRO MARTÍNEZ, P.V., LLULL, V., MICÓ PÉREZ, R., RIHUETE HERRADA, C. (1995): "La prehistoria reciente en el sudeste de la Península Ibérica. Dimensión socioeconómica de las prácticas funerarias". En Fábregas, R., Pérez, F. y Fernández, C. Arqueoloxía da Morte. Arqueoloxía da morte na Península Ibérica desde as Orixes ata o medievo. Excmo. Concello de Xinzo de Limia, pp. 129-167.CHAPA BRUNET, M.T. (2006): "Arqueología de la muerte: aspectos metodológicos". En Anales de Arqueología Cordobesa, 17, I, pp. 25-46.DUDAY, H. (2000): "Antropología biológica de campo, tafonomía y arqueología de la muerte". En Malvido, E., Pereira, G. y Tiesler, V. El cuerpo humano y su tratamiento mortuorio. Instituto Nacional de Antropología e Historia de México, pp. 91-126.FARJAS, M., MORENO, E., GARCÍA LÁZARO, F. J. (2011): "La realidad virtual y el análisis científico: De la nube de puntos al documento analítico.", Virtual Archaeology Review, Vol.2, Nº4, pp. 139-144. https://doi.org/10.4995/var.2011.4570FIORINI, A. (2008): "Esperienze di fotomodellazione e stereofotogrammetria archeologica" en VOLPE, G., DE FELICE, G., SIBILANO, M. G. (eds.), Digitalizzare la pesantezza. L'Informatica e il metodo della stratigrafia, Atti del Workshop, Foggia, pp. 175-186.LÓPEZ LILLO, J. A., CHARQUERO BALLESTER A. M. (2012): "Registro tridimensional acumulativo de la secuencia estratigráfica: Fotogrametría y SIG en la intervención arqueológica de lo Boligni (Alacant)", Virtual Archaeology Review, vol. 3, nº 5, pp. 81-88. https://doi.org/10.4995/var.2012.4529MAYS, S. (2010): The archaeology of human bones. Edición ampliada y revisada. Abingdon, Routledge.PÉREZ GARCÍA, J. L., MOZAS CALVACHE, A. T. et al. (2009): "Fotogrametría de bajo coste para estudios arqueológicos de la arquitectura: aplicación a la muralla este de la fortaleza de la mota. Alcalá la Real (Jaén)", en Mapping, nº 138, pp. 6-13.RODRÍGUEZ-NAVARRO, P. (2102): "Fotogrametría digital automatizada (SFM) con apoyo aéreo de proximidad". En XI Congreso Internacional. Expresión Gráfica Aplicada a la Edificación, Universitat Politècnica de València. (Pre Print).TEJADO SEBASTIÁN, J. M. (2005): "Escaneado en 3D y prototipado de piezas arqueológicas: las nuevas tecnologías en el registro, conservación y difusión del Patrimonio Arqueológico", IBERIA, nº 8, pp. 135-158

J-PAS: forecasts on dark energy and modified gravity theories

The next generation of galaxy surveys will allow us to test one of the most fundamental assumptions of the standard cosmology, i.e. that gravity is governed by the general theory of relativity (GR). In this paper, we investigate the ability of the Javalambre Physics of the AcceleratingUniverseAstrophysical Survey (J-PAS) to constrainGR and its extensions. Based on the J-PAS information on clustering and gravitational lensing, we perform a Fisher matrix forecast on the effective Newton constant, mu, and the gravitational slip parameter, eta, whose deviations from unity would indicate a breakdown of GR. Similar analysis is also performed for the DESI and Euclid surveys and compared to J-PAS with two configurations providing different areas, namely an initial expectation with 4000 deg(2) and the future best case scenario with 8500 deg(2). We show that J-PAS will be able to measure the parameters mu and eta at a sensitivity of 2-7 per cent, and will provide the best constraints in the interval z = 0.3-0.6, thanks to the large number of ELGs detectable in that redshift range. We also discuss the constraining power of J-PAS for dark energy models with a time-dependent equation-of-state parameter of the type w(a) = w(0) + w(a)(1 - a), obtaining Delta w(0) = 0.058 and Delta w(a) = 0.24 for the absolute errors of the dark energy parameters.© 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical SocietyWe are thankful to our colleagues of J-PAS Theory Working Group for useful discussions and to Ricardo Landim for his comments. MAR and ALM acknowledge support from MINECO (Spain) project FIS2016-78859-P (AEI/FEDER, UE), Red Consolider MultiDark FPA2017-90566-REDC, and UCM pre-doctoral grant. JSA acknowledges support from FAPERJ grant no. E-26/203.024/2017; CNPq grant no. 310790/2014-0 and 400471/2014-0; and the Financiadora de Estudos e Projetos -FINEP grants REF. 1217/13-01.13.0279.00 and REF0859/10-01.10.0663.00. SC acknowledges support from CNPq grant nos 307467/2017-1 and 420641/2018-1. This paper has gone through internal review by the J-PAS collaboration. Funding for the J-PAS Project has been provided by the Governments of Espana and Aragon through the Fondo de Inversion de Teruel, European FEDER funding, the MINECO projects AYA2015-66211-C2-1- P, AYA2015-66211-C2-2, and AYA2012-30789; the Brazilian agencies FINEP, FAPESP, FAPERJ and by the National Observatory of Brazil.Peer reviewe

“Fotogrametría Involuntaria”: rescatando información geométrica en 3D de fotografías de archivo

Nowadays digital photogrammetry has become one of the most efficient techniques for Heritage documentation. The creation of three-dimensional models from images taken with digital cameras is the usual procedure. The aim of this paper is showing the results obtained by photogrammetric analysis of library pictures, taken mainly in archaeological excavations, to recover three-dimensional information that maybe latent, although the shots had not been made with the purpose of creating 3D models. In this way we have generated three-dimensional models in which can be recovered geometric data that were not reflected in the drawings or photographs made during fieldwork.En la actualidad la fotogrametría digital se ha consolidado como una de las técnicas más eficientes para la documentación del Patrimonio. La generación de modelos tridimensionales a partir de imágenes realizadas con cámaras fotográficas digitales es el procedimiento habitual. Es objeto de este artículo mostrar los resultados obtenidos con el estudio y análisis fotogramétrico de imágenes de archivo, tomadas principalmente en excavaciones arqueológicas, para recuperar la información tridimensional que pueda estar latente en ellas, aunque las capturas no hubieran sido realizadas con el propósito de crear modelos 3D. De esta forma hemos generado modelos tridimensionales en los que se pueden recuperar datos geométricos que no quedaron reflejados en los dibujos o fotografías realizados en campo

Gravitational wave echoes from macroscopic quantum gravity effects

Abstract New theoretical approaches developed in the last years predict that macroscopic quantum gravity effects in black holes should lead to modifications of the gravitational wave signals expected in the framework of classical general relativity, with these modifications being characterized in certain scenarios by the existence of dampened rep-etitions of the primary signal. Here we use the fact that non-perturbative corrections to the near-horizon external geometry of black holes are necessary for these modifications to exist, in order to classify different proposals and paradigms with respect to this criterion and study in a neat and systematic way their phenomenology. Proposals that lead naturally to the existence of echoes in the late-time ringdown of gravitational wave signals from black hole mergers must share the replacement of black holes by horizonless configurations with a physical surface showing reflective properties in the relevant range of frequencies. On the other hand, proposals or paradigms that restrict quantum gravity effects on the external geometry to be perturbative, such as black hole complementarity or the closely related firewall proposal, do not display echoes. For the sake of completeness we exploit the interplay between the timescales associated with the formation of firewalls and the mechanism behind the existence of echoes in order to conclude that even unconventional distortions of the firewall concept (such as naked firewalls) do not lead to this phenomenon

The miniJPAS survey: A preview of the Universe in 56 colors

The Javalambre-Physics of the Accelerating Universe Astrophysical Survey (J-PAS) will scan thousands of square degrees of the northern sky with a unique set of 56 filters using the dedicated 2.55 m Javalambre Survey Telescope (JST) at the Javalambre Astrophysical Observatory. Prior to the installation of the main camera (4.2 deg2 field-of-view with 1.2 Gpixels), the JST was equipped with the JPAS-Pathfinder, a one CCD camera with a 0.3 deg2 field-of-view and plate scale of 0.23 arcsec pixel−1. To demonstrate the scientific potential of J-PAS, the JPAS-Pathfinder camera was used to perform miniJPAS, a ∼1 deg2 survey of the AEGIS field (along the Extended Groth Strip). The field was observed with the 56 J-PAS filters, which include 54 narrow band (FWHM ∼ 145 Å) and two broader filters extending to the UV and the near-infrared, complemented by the u, g, r, i SDSS broad band filters. In this miniJPAS survey overview paper, we present the miniJPAS data set (images and catalogs), as we highlight key aspects and applications of these unique spectro-photometric data and describe how to access the public data products. The data parameters reach depths of magAB ≃ 22−23.5 in the 54 narrow band filters and up to 24 in the broader filters (5σ in a 3″ aperture). The miniJPAS primary catalog contains more than 64 000 sources detected in the r band and with matched photometry in all other bands. This catalog is 99% complete at r = 23.6 (r = 22.7) mag for point-like (extended) sources. We show that our photometric redshifts have an accuracy better than 1% for all sources up to r = 22.5, and a precision of ≤0.3% for a subset consisting of about half of the sample. On this basis, we outline several scientific applications of our data, including the study of spatially-resolved stellar populations of nearby galaxies, the analysis of the large scale structure up to z ∼ 0.9, and the detection of large numbers of clusters and groups. Sub-percent redshift precision can also be reached for quasars, allowing for the study of the large-scale structure to be pushed to z > 2. The miniJPAS survey demonstrates the capability of the J-PAS filter system to accurately characterize a broad variety of sources and paves the way for the upcoming arrival of J-PAS, which will multiply this data by three orders of magnitude

The miniJPAS survey: a preview of the Universe in 56 colours

International audienceThe Javalambre-Physics of the Accelerating Universe Astrophysical Survey (J-PAS) will soon start to scan thousands of square degrees of the northern extragalactic sky with a unique set of $56$ optical filters from a dedicated $2.55$m telescope, JST, at the Javalambre Astrophysical Observatory. Before the arrival of the final instrument (a 1.2 Gpixels, 4.2deg$^2$ field-of-view camera), the JST was equipped with an interim camera (JPAS-Pathfinder), composed of one CCD with a 0.3deg$^2$ field-of-view and resolution of 0.23 arcsec pixel$^{-1}$. To demonstrate the scientific potential of J-PAS, with the JPAS-Pathfinder camera we carried out a survey on the AEGIS field (along the Extended Groth Strip), dubbed miniJPAS. We observed a total of $\sim 1$ deg$^2$, with the $56$ J-PAS filters, which include $54$ narrow band (NB, $\rm{FWHM} \sim 145$Angstrom) and two broader filters extending to the UV and the near-infrared, complemented by the $u,g,r,i$ SDSS broad band (BB) filters. In this paper we present the miniJPAS data set, the details of the catalogues and data access, and illustrate the scientific potential of our multi-band data. The data surpass the target depths originally planned for J-PAS, reaching $\rm{mag}_{\rm {AB}}$ between $\sim 22$ and $23.5$ for the NB filters and up to $24$ for the BB filters ($5\sigma$ in a $3$~arcsec aperture). The miniJPAS primary catalogue contains more than $64,000$ sources extracted in the $r$ detection band with forced photometry in all other bands. We estimate the catalogue to be complete up to $r=23.6$ for point-like sources and up to $r=22.7$ for extended sources. Photometric redshifts reach subpercent precision for all sources up to $r=22.5$, and a precision of $\sim 0.3$% for about half of the sample. (Abridged