Bonjour à tous et bienvenue sur ce Gitlab. Pour échanger avec ses autres utilisateurs, posez vos questions ou trouver des ressources, vous pouvez rejoindre le canal suivant : https://chat.univ-eiffel.fr/channel/forges-logicielles-github-et-gitlab-universite-gustave-eiffel

Skip to content

Changes

Page history
Update Coordonate system authored by Maël Tudal's avatar Maël Tudal
Hide whitespace changes
Inline Side-by-side
Coordonate-system.md
View page @ f87cdf4b
......@@ -2,17 +2,15 @@ The coordinate system in a GNSS is a system of reference used to specify the pos
**The WGS 84 coordinate system is defined by the following parameters:**
**- The Earth's semi-major axis (a) and semi-minor axis (b)** which define the size and shape of the Earth's ellipsoid.
**- The Earth's flattening (f)** which is the ratio of the difference between the major and minor axis to the major axis.
**- The Earth's eccentricity (e)** which is the square root of the first eccentricity squared ![lagrida_latex_editor__68_](uploads/f856dc21059cf7ff5d89755ef77e9e07/lagrida_latex_editor__68_.png).
* **The Earth's semi-major axis (a) and semi-minor axis (b)** which define the size and shape of the Earth's ellipsoid.
* **The Earth's flattening (f)** which is the ratio of the difference between the major and minor axis to the major axis.
* **The Earth's eccentricity (e)** which is the square root of the first eccentricity squared ![lagrida_latex_editor__68\_](uploads/f856dc21059cf7ff5d89755ef77e9e07/lagrida_latex_editor__68\_.png)
The WGS 84 coordinate system also uses a geographic coordinate system, which is based on the latitude and longitude of a point on the Earth's surface. Latitude is the angle between a point on the Earth's surface and the equatorial plane, and is measured in degrees north or south of the equator. Longitude is the angle between a point on the Earth's surface and the Prime Meridian, and is measured in degrees east or west of the Prime Meridian.
The WGS 84 coordinate system is used by the GNSS to specify the position of a point on the Earth's surface. The position of a point is represented by a set of coordinates in the form of latitude, longitude, and altitude.
![GPS+Coordinates+_WGS84_+WGS84+Cartesian+Latitude+_φ_+Longitude+_λ_](uploads/46632a9099fc571ed0c330c2daddcbe2/GPS+Coordinates+_WGS84_+WGS84+Cartesian+Latitude+_φ_+Longitude+_λ_.jpg)
![GPS+Coordinates+WGS84+WGS84+Cartesian+Latitude+φ+Longitude+λ](uploads/46632a9099fc571ed0c330c2daddcbe2/GPS+Coordinates+\_WGS84\_+WGS84+Cartesian+Latitude+\_%CF%86\_+Longitude+\_%CE%BB\_.jpg)
_This picture shows how Cartesian coordinates are turned into the WGS 84 coordinate system._
......@@ -21,4 +19,5 @@ The WGS 84 coordinate system is widely used in mapping, surveying, navigation, a
Overall, the coordinate system in GNSS is used to specify the position of a point on the Earth's surface. The most commonly used coordinate system in GNSS is the World Geodetic System 1984 (WGS 84), which is based on the Earth's shape as an oblate spheroid and uses a geographic coordinate system based on latitude and longitude. The WGS 84 coordinate system is used by the GPS and other GNSS to specify the position of a point on the Earth's surface and it is widely used in mapping, surveying, navigation, and other applications that require the precise location of points on the Earth's surface.
#### Sources :
Mestemaker, P. (2007). ST236 Site Calibrations with Trimble GNSS. [https://slideplayer.com/slide/9508891/](https://slideplayer.com/slide/9508891/)
Mestemaker, P. (2007). ST236 Site Calibrations with Trimble GNSS. https://slideplayer.com/slide/9508891/
\ No newline at end of file