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_op_fwd


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 -- Loadable Function: [X,Y] = _op_fwd(LON,LAT,PARAMS)

     This function projects geodetic coordinates into cartesian
     projected coordinates in the defined cartographic projection using
     the PROJ.4 function pj_fwd().

     LON is a column vector containing the geodetic longitude, in
     radians.  LAT is a column vector containing the geodetic latitude,
     in radians.  PARAMS is a text string containing the projection
     parameters in PROJ.4 format.

     The coordinate vectors LON and LAT must be both scalars or both
     column vectors (of the same size).

     X is a column vector containing the X projected coordinates.  Y is
     a column vector containing the Y projected coordinates.

     If a projection error occurs, the resultant coordinates for the
     affected points have both Inf value and a warning message is
     emitted (one for each erroneous point).

     See also: _op_inv, _op_transform.


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This function projects geodetic coordinates into cartesian projected
coordinates



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_op_geoc2geod


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 -- Loadable Function: [LON,LAT,H] = _op_geod2geoc(X,Y,Z,A,E2)

     This function converts cartesian tridimensional geodentric
     coordinates into geodetic using the PROJ.4 function
     pj_geocentric_to_geodetic().

     X is a column vector containing the X geocentric coordinate.  Y is
     a column vector containing the Y geocentric coordinate.  Z is a
     column vector containing the Z geocentric coordinate.  A is a
     scalar containing the semi-major axis of the ellipsoid.  E2 is a
     scalar containing the squared first eccentricity of the ellipsoid.

     The coordinate vectors X, Y and Z must be all scalars or all column
     vectors (of the same size).  The units of X, Y, Z and A must be the
     same.

     LON is a column vector containing the geodetic longitude, in
     radians.  LAT is a column vector containing the geodetic latitude,
     in radians.  H is a column vector containing the ellipsoidal
     height, in the same units of A,

     See also: _op_geod2geoc.


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This function converts cartesian tridimensional geodentric coordinates
into geod



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_op_geod2geoc


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 -- Loadable Function: [X,Y,Z] = _op_geod2geoc(LON,LAT,H,A,E2)

     This function converts geodetic coordinates into cartesian
     tridimensional geocentric coordinates using the PROJ.4 function
     pj_geodetic_to_geocentric().

     LON is a column vector containing the geodetic longitude, in
     radians.  LAT is a column vector containing the geodetic latitude,
     in radians.  H is a column vector containing the ellipsoidal
     height.  A is a scalar containing the semi-major axis of the
     ellipsoid.  E2 is a scalar containing the squared first
     eccentricity of the ellipsoid.

     The coordinate vectors LON, LAT and H must be all scalars or all
     column vectors (of the same size).  The units of H and A must be
     the same.

     X is a column vector containing the X geocentric coordinate, in the
     same units of A.  Y is a column vector containing the Y geocentric
     coordinate, in the same units of A.  Z is a column vector
     containing the Z geocentric coordinate, in the same units of A.

     See also: _op_geoc2geod.


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This function converts geodetic coordinates into cartesian
tridimensional geocen



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_op_inv


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 -- Loadable Function: [LON,LAT] = _op_inv(X,Y,PARAMS)

     This function unprojects cartesian projected coordinates (in a
     defined cartographic projection) into geodetic coordinates using
     the PROJ.4 function pj_inv().

     X is a column vector containing the X projected coordinates.  Y is
     a column vector containing the Y projected coordinates.  PARAMS is
     a text string containing the projection parameters in PROJ.4
     format.

     The coordinate vectors X and Y must be both scalars or both column
     vectors (of the same size).

     LON is a column vector containing the geodetic longitude, in
     radians.  LAT is a column vector containing the geodetic latitude,
     in radians.

     If a projection error occurs, the resultant coordinates for the
     affected points have both Inf value and a warning message is
     emitted (one for each erroneous point).

     See also: _op_fwd, _op_transform.


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This function unprojects cartesian projected coordinates (in a defined
cartograp



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_op_transform


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 -- Loadable Function: [X2,Y2,Z2] = _op_transform(X1,Y1,Z1,PAR1,PAR2)

     This function transforms X/Y/Z, lon/lat/h points between two
     coordinate systems 1 and 2 using the PROJ.4 function
     pj_transform().

     X1 is a column vector containing the first coordinates in the
     source coordinate system.  If X1 is geodetic longitude, it must be
     passed in radians.  Y1 is a column vector containing the second
     coordinates in the source coordinate system.  If Y1 is geodetic
     latitude, it must be passed in radians.  Z1 is a column vector
     containing the third first coordinates in the source coordinate
     system.  PAR1 is a text string containing the projection parameters
     for the source system, in PROJ.4 format.  PAR2 is a text string
     containing the projection parameters for the destination system, in
     PROJ.4 format.

     The coordinate vectors X1, Y1 and Z1 must be all scalars or all
     column vectors (of the same size).

     X2 is a column vector containing the first coordinates in the
     destination coordinate system.  If X2 is geodetic longitude, it is
     output in radians.  Y2 is a column vector containing the second
     coordinates in the destination coordinate system.  If Y2 is
     geodetic longitude, it is output in radians.  Z2 is a column vector
     containing the third coordinates in the destination coordinate
     system.

     See also: _op_fwd, _op_inv.


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This function transforms X/Y/Z, lon/lat/h points between two coordinate
systems 





