mirror of https://github.com/wb2osz/direwolf.git
210 lines
8.6 KiB
C
210 lines
8.6 KiB
C
#ifndef TRANMERC_H
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#define TRANMERC_H
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/***************************************************************************/
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/* RSC IDENTIFIER: TRANSVERSE MERCATOR
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*
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* ABSTRACT
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*
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* This component provides conversions between Geodetic coordinates
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* (latitude and longitude) and Transverse Mercator projection coordinates
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* (easting and northing).
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*
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* ERROR HANDLING
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*
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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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*
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* TRANMERC_NO_ERROR : No errors occurred in function
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* TRANMERC_LAT_ERROR : Latitude outside of valid range
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* (-90 to 90 degrees)
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* TRANMERC_LON_ERROR : Longitude outside of valid range
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* (-180 to 360 degrees, and within
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* +/-90 of Central Meridian)
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* TRANMERC_EASTING_ERROR : Easting outside of valid range
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* (depending on ellipsoid and
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* projection parameters)
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* TRANMERC_NORTHING_ERROR : Northing outside of valid range
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* (depending on ellipsoid and
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* projection parameters)
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* TRANMERC_ORIGIN_LAT_ERROR : Origin latitude outside of valid range
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* (-90 to 90 degrees)
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* TRANMERC_CENT_MER_ERROR : Central meridian outside of valid range
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* (-180 to 360 degrees)
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* TRANMERC_A_ERROR : Semi-major axis less than or equal to zero
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* TRANMERC_INV_F_ERROR : Inverse flattening outside of valid range
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* (250 to 350)
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* TRANMERC_SCALE_FACTOR_ERROR : Scale factor outside of valid
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* range (0.3 to 3.0)
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* TM_LON_WARNING : Distortion will result if longitude is more
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* than 9 degrees from the Central Meridian
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*
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* REUSE NOTES
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*
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* TRANSVERSE MERCATOR is intended for reuse by any application that
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* performs a Transverse Mercator projection or its inverse.
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*
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* REFERENCES
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*
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* Further information on TRANSVERSE MERCATOR can be found in the
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* Reuse Manual.
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*
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* TRANSVERSE MERCATOR originated from :
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* U.S. Army Topographic Engineering Center
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* Geospatial Information Division
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* 7701 Telegraph Road
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* Alexandria, VA 22310-3864
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*
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* LICENSES
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*
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* None apply to this component.
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*
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* RESTRICTIONS
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*
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* TRANSVERSE MERCATOR has no restrictions.
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*
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* ENVIRONMENT
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*
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* TRANSVERSE MERCATOR was tested and certified in the following
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* environments:
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*
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* 1. Solaris 2.5 with GCC, version 2.8.1
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* 2. Windows 95 with MS Visual C++, version 6
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*
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* MODIFICATIONS
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*
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* Date Description
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* ---- -----------
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* 10-02-97 Original Code
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* 03-02-97 Re-engineered Code
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*
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*/
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/***************************************************************************/
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/*
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* DEFINES
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*/
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#define TRANMERC_NO_ERROR 0x0000
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#define TRANMERC_LAT_ERROR 0x0001
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#define TRANMERC_LON_ERROR 0x0002
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#define TRANMERC_EASTING_ERROR 0x0004
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#define TRANMERC_NORTHING_ERROR 0x0008
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#define TRANMERC_ORIGIN_LAT_ERROR 0x0010
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#define TRANMERC_CENT_MER_ERROR 0x0020
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#define TRANMERC_A_ERROR 0x0040
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#define TRANMERC_INV_F_ERROR 0x0080
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#define TRANMERC_SCALE_FACTOR_ERROR 0x0100
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#define TRANMERC_LON_WARNING 0x0200
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/***************************************************************************/
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/*
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* FUNCTION PROTOTYPES
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* for TRANMERC.C
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*/
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/* ensure proper linkage to c++ programs */
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#ifdef __cplusplus
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extern "C" {
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#endif
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long Set_Transverse_Mercator_Parameters(double a,
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double f,
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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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double Scale_Factor);
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/*
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* The function Set_Tranverse_Mercator_Parameters receives the ellipsoid
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* parameters and Tranverse Mercator projection parameters as inputs, and
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* sets the corresponding state variables. If any errors occur, the error
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* code(s) are returned by the function, otherwise TRANMERC_NO_ERROR is
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* returned.
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*
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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 the origin of the (input)
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* projection
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* Central_Meridian : Longitude in radians at the center of the (input)
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* projection
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* False_Easting : Easting/X at the center of the projection (input)
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* False_Northing : Northing/Y at the center of the projection (input)
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* Scale_Factor : Projection scale factor (input)
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*/
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void Get_Transverse_Mercator_Parameters(double *a,
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double *f,
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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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double *Scale_Factor);
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/*
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* The function Get_Transverse_Mercator_Parameters returns the current
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* ellipsoid and Transverse Mercator projection parameters.
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*
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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 the origin of the (output)
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* projection
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* Central_Meridian : Longitude in radians at the center of the (output)
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* projection
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* False_Easting : Easting/X at the center of the projection (output)
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* False_Northing : Northing/Y at the center of the projection (output)
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* Scale_Factor : Projection scale factor (output)
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*/
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long Convert_Geodetic_To_Transverse_Mercator (double Latitude,
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double Longitude,
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double *Easting,
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double *Northing);
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/*
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* The function Convert_Geodetic_To_Transverse_Mercator converts geodetic
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* (latitude and longitude) coordinates to Transverse Mercator projection
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* (easting and northing) coordinates, according to the current ellipsoid
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* and Transverse Mercator projection coordinates. If any errors occur, the
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* error code(s) are returned by the function, otherwise TRANMERC_NO_ERROR is
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* returned.
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*
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* Latitude : Latitude in radians (input)
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* Longitude : Longitude 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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*/
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long Convert_Transverse_Mercator_To_Geodetic (double Easting,
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double Northing,
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double *Latitude,
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double *Longitude);
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/*
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* The function Convert_Transverse_Mercator_To_Geodetic converts Transverse
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* Mercator projection (easting and northing) coordinates to geodetic
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* (latitude and longitude) coordinates, according to the current ellipsoid
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* and Transverse Mercator projection parameters. If any errors occur, the
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* error code(s) are returned by the function, otherwise TRANMERC_NO_ERROR is
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* returned.
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*
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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 in radians (output)
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* Longitude : Longitude in radians (output)
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*/
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#ifdef __cplusplus
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}
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#endif
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#endif /* TRANMERC_H */
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