2,640 research outputs found
The first unparametrized image of the shrivelled world. author A L'Hostis 2016
No full textThe first image unparametrized of the shrivelled world, produced with Cesium. author A L'Hostis 201
The first unparametrized image of the shrivelled world. author A L'Hostis 2016
No full textThe first image unparametrized of the shrivelled world, produced with Cesium. author A L'Hostis 201
The first time-space relief cartography, analog photography of cathodic screen
No full textIn 1994 in the CESA, spatial planning center of Tours University, the first time-space cartography took the form of an analog photo of a cathodic screen of European time-space, as shown on the image. The image was produced by Alain L'Hostis, by means of the computer program MapNod, from the indications of Philippe Mathis. The first time-space relief cartography, analog photo of cathodic screen, Europe CC-BY A L'Hostis At that time the model is not finished as illustrated by the incomplete bo..
The first time-space relief cartography, analog photography of cathodic screen
No full textIn 1994 in the CESA, spatial planning center of Tours University, the first time-space cartography took the form of an analog photo of a cathodic screen of European time-space, as shown on the image. The image was produced by Alain L'Hostis, by means of the computer program MapNod, from the indications of Philippe Mathis. The first time-space relief cartography, analog photo of cathodic screen, Europe CC-BY A L'Hostis At that time the model is not finished as illustrated by the incomplete bo..
Sketch of the model
No full textSketch of the time-space model with a conic time space surface limited by the shoreline of an island (L'Hostis 2016 CC-BY) This is how it will look like when the model will be complete. Time-space is represented by cones. As explained here, the slope of the cone allows to produce longer itineraries proportionally to the maximum available speed on the space considered. Then two issues must be resolved, one theoretical, and the other more linked to graphic and cartographic choices. Firstly this..
The first image of a shriveling world
No full textThe first unparametrized image of the shriveled world. CC-BY A L'Hostis 2016 Using the library Cesium, and with great help from Thomas Leysens and Farouk Abdou, this is the first image (in higher quality here) out of this new project, producing a representation of global time space. Very excited when I first saw it on my computer screen. This is the first time this image, which I had in mind for years, finally materializes. Unfortunately it has proven very difficult, for me at least, to contr..
The first image of a shriveling world
No full textThe first unparametrized image of the shriveled world. CC-BY A L'Hostis 2016 Using the library Cesium, and with great help from Thomas Leysens and Farouk Abdou, this is the first image (in higher quality here) out of this new project, producing a representation of global time space. Very excited when I first saw it on my computer screen. This is the first time this image, which I had in mind for years, finally materializes. Unfortunately it has proven very difficult, for me at least, to contr..
Setting the height or the radius of cones?
No full textThe Sahara desert as one of the largest terrestrial area devoid of cities, an issue for time-space global cartography (L'Hostis 2016 CC-BY) In the testing of the model, the issue of the height of cones came quite quickly to the fore. As, by construction according to the principle of the model, cones are entirely drawn under the surface of the earth, cones where initially envisaged as having the height of the earth radius. Nevertheless, this choice rapidly became problematic. The limit case ..
All geographical distances are optimal
No full textInternational audienceTriangular inequality is one of the four mathematical properties of distance. Its respect derives from the optimal nature of the measurement of distance. This demonstration (L'Hostis 2016, 2017) reveals key aspects of distances and geographical spaces. We develop this argument by investigating the idea of the optimality of distance through a mathematical and geometric discussion, and by dealing with empirical approaches to applied geography.The first part of the paper explores the consequences of considering that the mathematical property of triangle inequality is always respected. In fact, no violations of triangle inequality are observed in geographical spaces. The study of the optimality of distances in empirical approaches confirms the key role of the property of triangle inequality. The general principle of least-effort applies for most movements and spacings. In addition, however, trajectories with multiple detours, like those of shoppers, runners and nomads, are optimal from a certain point of view. This is also the case for excess travel, i.e. a situation of disjunction between an optimum as perceived by a person in movement and an optimum as perceived by an external observer. Any movement, any spacing within and between cities and in geographical space in general, exhibits a form of optimality, and all geographical distances are optimal
Mr Alain Elkann Author and Journalist Italian Republic
No full textVisit by Mr Alain Elkann Author and Journalist Italian Republi
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