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.
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.