User Earth Model Management (Datum or Ellipses)

 

This window allows including, editing or removing custom Earth Model in SPRING. The table shows, initially, both user created and default (hereafter system) datums. User created datums will be show at the beginning of the table, with system datums following. System datums are exhibited only for visualization. Through the button "Show Datuns" it's possible to toggle the visualization between User Datuns, System Datuns and both (default value).

Table fields are: (1)Projection; (2)Name; (3)Major semi-axies or equatorial radius; (4)Flattening; (5)X translation; (6)Y translation; and (7)Z translation. The Projection field is fixed and may have the following values: NOPROJECTION; UTM; MERCATOR; GAUSS; LAMBERT MILLION; LAMBERT; POLYCONIC; CYLINDRICAL; LATLONG; POLAR STEREOGRAPHIC; BIPOLAR OBLIQUE; ALBERS; MILLER; and SINUSOIDAL. The Name field may have any value. 3 to 7 parameters are calculated and published by Cartography and Geodesy offical agencies for each country. To add, edit or remove an Earth Model one must first enter Table Editing Mode through the button "Edit Table".

 Add an Earth Model

 Edit an Earth Model

Remove an Earth Model

After editing modifications must be saved or will be lost.

 

Janela de gerenciamento de Datuns

It's important to notice that exists three situations where the translations field may hold a null value.