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After selecting the menu item »Change Projection Data ...« the dialog field »Projection Data of ...« will appear. Here you can vary diverse projection data.
Please click onto the part of the dialog field to which you want get informations.
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For fixing the radius the measuring units »inches«, »millimeters« (mm) and »pixels« are available. In this matter inches and millimeters (mm) regulate the proportions of any printer output of the map.
The input of the distance between the point of perspective and the centre of the Earth for vertical perspective projections takes place as a multiple of the radius.
If the projection axis is identical to the pole axis, the chosen projection is called regular- or normal-axial.
This is normally the preset location of the projection axis (marker ).
You can locate the projection axis at a general position if the selected projection allows this. Then we talk about a so-called oblique-axial projection.
If the projection axis joins the equatorial plane (geographic latitude v = 0 degrees / geographic longitude u any choice), it is a matter of transverse-axial projection.
Here you are able to select the standard parallels, if there are any for the chosen projection. In this case you have to note the special facts of the cylindrical resp. the conic projection concerning valid standard parallels.
If you are just working with a renumeralised projection you are able to vary the »scale constants« and the »grid numeral constants« on trial. Nevertheless, you will recognize that as a result the constructed projection is not allways a »beautiful« one.
Please note:
For equal-area renumeralisation the product of the constants C1, C2, C3 and C4 is equal to 1.
See also | |
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Systematics of Map Projections |
To the beginning of the chapter | |
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The control system of GridMaps |