In general: uc = (A / B) atan((Dsq - 1)^0.5 / cos (alphac) ) * SIGN(latc)īut for the special cases where alphac = 90 degrees (e.g. If D < 1 to avoid problems with computation of F make D^2 = 1 The following constants for the projection may be calculated :ī = ^0.5Ī = a * B * kc *(1 - e^2 )^0.5 / ( 1 - e^2 * sin^2(latc)) Users are encouraged to use that document rather than the text which follows as reference because limitations in the transcription will be avoided. Note: These formulas have been transcribed from EPSG Guidance Note #7-2. Reverse calculations for same easting and northing first gives : Northing at projection centre Nc = 442857.65 m Borneo (m)Įllipsoid: Everest 1830 (1967 Definition) For Projected Coordinate System Timbalai 1948 / R.S.O.
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