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/***************************************************************************/
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/* RSC IDENTIFIER: CYLINDRICAL EQUAL AREA
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* This component provides conversions between Geodetic coordinates
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* (latitude and longitude in radians) and Cylindrical Equal Area projection
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* coordinates (easting and northing in meters).
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* This component checks parameters for valid values. If an invalid value
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* is found, the error code is combined with the current error code using
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* the bitwise or. This combining allows multiple error codes to be
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* returned. The possible error codes are:
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* CYEQ_NO_ERROR : No errors occurred in function
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* CYEQ_LAT_ERROR : Latitude outside of valid range
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* CYEQ_LON_ERROR : Longitude outside of valid range
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* (-180 to 360 degrees)
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* CYEQ_EASTING_ERROR : Easting outside of valid range
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* (False_Easting +/- ~20,000,000 m,
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* depending on ellipsoid parameters
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* and Origin_Latitude)
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* CYEQ_NORTHING_ERROR : Northing outside of valid range
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* (False_Northing +/- ~6,000,000 m,
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* depending on ellipsoid parameters
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* and Origin_Latitude)
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* CYEQ_ORIGIN_LAT_ERROR : Origin latitude outside of valid range
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* CYEQ_CENT_MER_ERROR : Central meridian outside of valid range
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* (-180 to 360 degrees)
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* CYEQ_A_ERROR : Semi-major axis less than or equal to zero
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* CYEQ_INV_F_ERROR : Inverse flattening outside of valid range
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* CYLINDRICAL EQUAL AREA is intended for reuse by any application that performs a
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* Cylindrical Equal Area projection or its inverse.
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* Further information on CYLINDRICAL EQUAL AREA can be found in the Reuse Manual.
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* CYLINDRICAL EQUAL AREA originated from :
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* U.S. Army Topographic Engineering Center
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* Geospatial Information Division
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* Alexandria, VA 22310-3864
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* None apply to this component.
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* CYLINDRICAL EQUAL AREA has no restrictions.
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* CYLINDRICAL EQUAL AREA was tested and certified in the following environments:
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* 1. Solaris 2.5 with GCC 2.8.1
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* 2. MS Windows 95 with MS Visual C++ 6
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* 4/16/99 Original Code
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/***************************************************************************/
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#define CYEQ_NO_ERROR 0x0000
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#define CYEQ_LAT_ERROR 0x0001
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#define CYEQ_LON_ERROR 0x0002
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#define CYEQ_EASTING_ERROR 0x0004
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#define CYEQ_NORTHING_ERROR 0x0008
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#define CYEQ_ORIGIN_LAT_ERROR 0x0010
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#define CYEQ_CENT_MER_ERROR 0x0020
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#define CYEQ_A_ERROR 0x0040
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#define CYEQ_INV_F_ERROR 0x0080
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/***************************************************************************/
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/* ensure proper linkage to c++ programs */
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long Set_Cyl_Eq_Area_Parameters(double a,
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double Origin_Latitude,
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double Central_Meridian,
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double False_Easting,
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double False_Northing);
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* The function Set_Cyl_Eq_Area_Parameters receives the ellipsoid parameters and
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* Cylindrical Equal Area projcetion parameters as inputs, and sets the corresponding
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* state variables. If any errors occur, the error code(s) are returned by the
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* function, otherwise CYEQ_NO_ERROR is returned.
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* a : Semi-major axis of ellipsoid, in meters (input)
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* f : Flattening of ellipsoid (input)
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* Origin_Latitude : Latitude in radians at which the (input)
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* point scale factor is 1.0
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* Central_Meridian : Longitude in radians at the center of (input)
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* False_Easting : A coordinate value in meters assigned to the
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* central meridian of the projection. (input)
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* False_Northing : A coordinate value in meters assigned to the
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* origin latitude of the projection (input)
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void Get_Cyl_Eq_Area_Parameters(double *a,
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double *Origin_Latitude,
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double *Central_Meridian,
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double *False_Easting,
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double *False_Northing);
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* The function Get_Cyl_Eq_Area_Parameters returns the current ellipsoid
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* parameters and Cylindrical Equal Area projection parameters.
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* a : Semi-major axis of ellipsoid, in meters (output)
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* f : Flattening of ellipsoid (output)
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* Origin_Latitude : Latitude in radians at which the (output)
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* point scale factor is 1.0
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* Central_Meridian : Longitude in radians at the center of (output)
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* False_Easting : A coordinate value in meters assigned to the
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* central meridian of the projection. (output)
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* False_Northing : A coordinate value in meters assigned to the
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* origin latitude of the projection (output)
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long Convert_Geodetic_To_Cyl_Eq_Area (double Latitude,
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* The function Convert_Geodetic_To_Cyl_Eq_Area converts geodetic (latitude and
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* longitude) coordinates to Cylindrical Equal Area projection easting, and northing
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* coordinates, according to the current ellipsoid and Cylindrical Equal Area projection
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* parameters. If any errors occur, the error code(s) are returned by the
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* function, otherwise CYEQ_NO_ERROR is returned.
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* Latitude : Latitude (phi) in radians (input)
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* Longitude : Longitude (lambda) in radians (input)
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* Easting : Easting (X) in meters (output)
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* Northing : Northing (Y) in meters (output)
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long Convert_Cyl_Eq_Area_To_Geodetic(double Easting,
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* The function Convert_Cyl_Eq_Area_To_Geodetic converts Cylindrical Equal Area projection
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* easting and northing coordinates to geodetic (latitude and longitude)
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* coordinates, according to the current ellipsoid and Cylindrical Equal Area projection
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* coordinates. If any errors occur, the error code(s) are returned by the
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* function, otherwise CYEQ_NO_ERROR is returned.
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* Easting : Easting (X) in meters (input)
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* Northing : Northing (Y) in meters (input)
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* Latitude : Latitude (phi) in radians (output)
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* Longitude : Longitude (lambda) in radians (output)
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#endif /* CYLEQA_H */
added
removed
dt_cc/cyleqa/cyleqa.h
