Geophysics

1905 Submissions

[3] viXra:1905.0249 [pdf] submitted on 2019-05-16 19:31:34

Le Découpage Cartographique International

Authors: Abdelmajid Ben Hadj Salem
Comments: 7 Pages. In French.

This note concerns the international cartographic division. It gives how is organized the numbering of sheets at different scales ranging from 1/500 to 1/50000 and their sizes and surfaces.
Category: Geophysics

[2] viXra:1905.0200 [pdf] replaced on 2019-05-14 08:30:24

Systèmes de Référence, Systèmes Projectifs

Authors: Henri Marcel Dufour, Abdelmajid Ben Hadj Salem
Comments: 27 Pages. In French. It is an-update version of a paper dated 1979 with comments of the second author.

Many geodetic works currently exist on the surface of the globe, which have developed through regional networks, usually each having a fundamental point, where the astronomical data (\phi= latitude,\lambda=longitude,Az=azimuth) of a reference are confused with the counterparts geodetic data. The comparison of 2 networks, and, step by step, of all the connectable networks, can be done by the analysis of the coordinates of their common points. To this end, we can use 3 types of coordinates: - Geographical coordinates = simple method, but not very convenient for different ellipsoids. - Three-dimensional cartesian coordinates, the most rigorous method in the case where the so-called geoid correction has been made. - Coordinates in conformal projection. An analysis of the main formulas that can be used is studied by the first author in this article.
Category: Geophysics

[1] viXra:1905.0115 [pdf] submitted on 2019-05-07 18:41:22

A Note About Dufour-Fezzani Formula

Authors: Abdelmajid Ben Hadj Salem
Comments: 7 Pages. In French.

In this note, we review the Dufour-Fezzani formula concerning the comparison of two geodetic networks. This formula is developed for ellipsoidal models.
Category: Geophysics