Shriveling untill resembling a chestnut

Concorde time shriveled world
Shriveling time-space relief representation of the world at the time of Concorde 1977-2003 CC-BY A L’Hostis

“And yet it moves”, said Galileo. “And yet this is the earth as we experience it” could we now say, looking at this image.

Produced by a JavaScript code based on the library three.js, with decisive help from Farouk Abdou, this is the first accurately parametrized representation of the global time space, at the time of Concorde (1977-2003), when the maximum available transport speed, that indicates the standard for maximum speed, was 1500 km/h. The principle of construction of the image is detailed here.

This has been, so far, the most intense shriveling movement in transport history, when the maximum available speed raised from 700 km/h with jets to the supersonic speed of Concorde.

Considering, in a simplified model, terrestrial speed of 100 km/h, say on a motorway or by train, the slope of cones takes this geometry. During this Concorde period, terrestrial speed was 15 times slower than the maximum available  speed.

This image is very close to the idea of the chestnut that I announced in 2007. High quality image download link.

The first image of a shriveling world

Shriveled world unparametrized
The 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 control cones geometry. In addition in Cesium it is not possible to draw geometries under the surface of the globe. the problem is that, conceptually, the time-space relief map model, everything occurs under the surface.

An exchange with Cesium developers has indicated an alternative choice: the library three.js, which has less limitations for our purpose.

The first time-space relief cartography, analog photography of cathodic screen

In 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.

Time-space relief cartographic representation of Europe
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 bottom of facets. A triangle is missing but all the networks are visible, since they form the structure on which the relief is drawn.  Relief comes as a surface along the deformed road network. Three terrestrial transport modes are represented here: classic road, motorway (mode 6) and  high-speed rail (mode 3).

By lack of available color printer in the CESA laboratory, analog photo of computer screen was one of the few possible options to realize this cartography. Later we used print-screen software to produce bitmap images, and even later developed the software MapNod to produce direct vectorial images in the WMF format.