<< Click to Display Table of Contents >> Navigation:  Projections and Datums > The Custom Projection panel

The Custom projection panel consists of the following controls to customize the selected projection:

 

Datum tab

 

Add favorites: adds the selected projection to the Favorites

 

Datum tab:

 

Type of: Select a projection type (algorithm).

 

•Geographic

•Stereographic projection

•Mercator

•Transverse Mercator

•Oblique Mercator

•Hotine Oblique Mercator

•Lambert conformal conic

•Hungarian stereographic

•Hungarian cylindrical

•Hungarian Unified projection

•Swiss cylindrical

•Romania TransDat 2009

 

Projection tab:

 

Projection tab

 

Datum parameters

 

Spheroid (a, 1/f): Semi-major Axis, Inverse Flattening ratio.

 

Offset (dx, dy, dz): Offset DX, DY, DZ to WGS84 parameters in meter.

Rotate (rx, ry, rz): Rotate RX, RY, RZ to WGS84  parameters in arc seconds.

Scale (s): Scale Factor in ppm.

 

Projection parameters

 

Ref. longitude (la0): Origin Longitude in degree.

Ref. latitude (fi0): Origin Latitude in degree.

1st latitude (fi1): First Latitude in degree.

2nd latitude (fi2): Second latitude in degree.

Scale (m): Scale Factor.

Unit scale: Unit scale value (indicates the unit value in meter).

Origin (fe, fn): False easting, False nothing.

 

The modified Datum and Projection parameters are stored in in TopoLynx topoXplore Map (.EXP) / TopoLynx Map Pack (.DMP) files and in the user.db3 file

 

 

Boundaries tab

 

You can set the boundaries of the projection in degrees (WGS84 coordinates) and you can also edit or copy the Proj4 text which describes the projection.