Specifications
The Swedish Grid is a Grid coordinate system based on the Transverse Mercator projection, all
required parameters are known.
(SUI) Swiss Grid
This is a specific projection and a grid system only used by Switzerland. All required parameters are
known.
Lambert Conformal Conic
A sterographic projection which gives good directional and shape relationships, useful for large scale
mapping. Used for air navigation and meteorological charts.
You need to enter the 2 lines of Latitude and the Central Meridian which are required to calculate
this projection, these must be known for the particular map you are using.
Sometimes the projection can be specified with only 1 line of Latitude, since oziExplorer expects
there to be 2 lines of latitude specified which are different values simply enter one of the values as a
slightly different number (say add .000001 of a minute to the value).
Sinusoidal
The lines of latitude are straight and equally spaced. The Central Meridian is straight all other lines
of longitude are curved. Good projection for large continental sized areas.
You need to enter the Central Meridian for the particular map you are using.
Polyconic (American)
Preserves area,shape, distance and azimuth for small areas, best for north
-
south extents. Former
projection for US topographic maps, not recommended for larger areas because of distortion.
You need to enter the Central Meridian for the particular map you are using.
Albers Equal Area
Best for maps of east
-
west extents away from the equator, one of the most commonly used
projections for maps of conterminous USA.
You need to enter the 2 lines of Latitude and the Central Meridian which are required to calculate
this projection, these must be known for the particular map you are using. The Latitude Origin may
also be required but defaults to zero degrees.
The France Grids
Calibration Procedure
Lambert I, II, III, IV maps
Map Datum
-
Select the datum you want to use for the map, the most likely would be "European
1950 (Mean France)". Even though the France Grids use "NTF France" for the IGN coordinates
there is no need to choose this as the map datum as OziExplorer will automatically use the "NTF
France" datum in its internal calculations but produce the positions in the selected map datum.
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OziExplorer Help Contents