COMPARISON OF LOW COST PHOTOGRAMMETRIC SURVEY WITH TLS AND LEICA PEGASUS BACKPACK 3D MODELS

This paper considers Leica backpack and photogrammetric surveys of a mediaeval bastion in Padua, Italy. Furhtermore, terrestrial laser scanning (TLS) survey is considered in order to provide a state of the art reconstruction of the bastion. Despite control points are typically used to avoid deformations in photogrammetric surveys and ensure correct scaling of the reconstruction, in this paper a different approach is considered: this work is part of a project aiming at the development of a system exploiting ultra-wide band (UWB) devices to provide correct scaling of the reconstruction. In particular, low cost Pozyx UWB devices are used to estimate camera positions during image acquisitions. Then, in order to obtain a metric reconstruction, scale factor in the photogrammetric survey is estimated by comparing camera positions obtained from UWB measurements with those obtained from photogrammetric reconstruction. Compared with the TLS survey, the considered photogrammetric model of the bastion results in a RMSE of 21.9cm, average error 13.4cm, and standard deviation 13.5cm. Excluding the final part of the bastion left wing, where the presence of several poles make reconstruction more difficult, (RMSE) fitting error is 17.3cm, average error 11.5cm, and standard deviation 9.5cm. Instead, comparison of Leica backpack and TLS surveys leads to an average error of 4.7cm and standard deviation 0.6cm (4.2 cm and 0.3 cm, respectively, by excluding the final part of the left wing)

Last bastion of reason

Attacks the irrationalism of Lakatos's Proofs and Refutations and defends mathematics as a "last bastion" of reason against postmodernist and deconstructionist currents

William Drummond and the Battle of Fort Erie

The officers and men of the British army that defended Canada from American invasion during the War of 1812 knew they were “forgotten soldiers.” Fighting in a distant and secondary theatre, far from the gaze of a government and public pre-occupied with events on the continent, especially in Spain, they took a somewhat perverse pride in their status as outcasts. As one quipped about the Duke of Wellington—“thank God he managed to do without us” at Waterloo. But they also took a particular pride in their own local heroes including such men as Gordon of the 1st Regiment of Foot, Robinson of the 8th Foot, Glew of the 41st, Fitzgibbon of the 49th, Morrison of the 89th, Dawson and Tweeddale of the 100th, Scott of the 103rd and—perhaps most renowned of all—Lieutenant Colonel William Drummond of the 104th Foot

“The Union Forever”: Frederick, Maryland in the Elections of 1860 and 1864

Frederick, Maryland has been remembered as a bastion of Unionist sentiment during the Civil War. However, in the Election of 1860, on the eve of the nation’s internal conflict, a large portion of the city’s 8,000 residents voted for a secessionist candidate. The Election of 1860 is famous for straying from the typical bi-partisan election; four candidates ran for office and each appealed to different political sentiments. [excerpt

Assault on Calais: 25 September–1 October 1944

Account by Major W.H.V. Matthews, MC and Bar, Officer Commanding, “A” Company, 1st Canadian Scottish Regiment to Historical Officer, 19 October 1944

Technology as the God-Command

Giorgio Agamben's Creation and Anarchy is comprised of five meditative essays compiled over the last few years and presented as an anthologized collection. The initial few chapters' survey postmodern art qua divinity, with particular interest to a contradictory dialectic: inspiration and critique. Drawing from an idiosyncratic amalgam of thinkers–ranging from bastion thinkers such as Kant and Heidegger to zoologist Jacob von Ueküll and prescient media philosopher Gilbert Simondon–Agamben carves a historiographic lineage between politics, animal studies, landscape painting, and religion

Micropalaeontology reveals the source of building materials for a defensive earthwork (English Civil War?) at Wallingford Castle, Oxfordshire

Microfossils recovered from sediment used to construct a putative English Civil War defensive bastion at Wallingford Castle, south Oxfordshire, provide a biostratigraphical age of Cretaceous (earliest Cenomanian) basal M. mantelli Biozone. The rock used in the buttress – which may have housed a gun emplacement – can thus be tracked to the Glauconitic Marl Member, base of the West Melbury Marly Chalk Formation. A supply of this rock is available on the castle site or to the east of the River Thames near Crowmarsh Gifford. Microfossils provide a unique means to provenance construction materials used at the Wallingford site. While serendipity may have been the chief cause for use of the Glauconitic Marl, when compacted, it forms a strong, almost ‘road base’-like foundation that was clearly of use for constructing defensive works. Indeed, use of the Glauconitic Marl was widespread in the area for agricultural purposes and its properties may have been well-known locally

Discourse metaphors: the link between figurative language and habitual analogies

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