EPSG:9619

Geographic2D offsets

Attributes

Data source: EPSG

Information source: EPSG guidance note #7-2, http://www.epsg.org

Revision date: 2017-06-13

Remarks: This transformation allows calculation of coordinates in the target system by adding the parameter value to the coordinate values of the point in the source system.

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Formula

Note: These formulas have been transcribed from EPSG Guidance Note #7-2. Users are encouraged to use that document rather than the text which follows as reference because limitations in the transcription will be avoided.

Lat_T = Lat_S + latitude_offset 
Lon_T = Lon_S + longitude_offset.

Example

A position with coordinates of 38°08'36.565"N, 23°48'16.235"E referenced to the old Greek geographic 2D coordinate reference system (EPSG CRS code 4120) is to be transformed to the newer GGRS87 system (EPSG CRS code 4121). Transformation parameters from Greek to GGRS87 are:
dLat	=	-5.86"
dLon	=	+0.28"

Then Lat(GGRS87) 	 =	38°08'3656 5" N		(5.8 6")	 =	38°08'30.705"N
and Lon(GGRS87) 	=	23°48'16.23  5"E	+	0. 28"	 =	23°48'16.515"E

For the reverse transformation for the same point, 
Lat(GREEK) 	 =	38°08'30.705  " N	+	5. 86"  	 =	38°08'36.565"N
Lon(GREEK) 	 =	23°48'16.515" E 	 +	(-0. 28 ")	 =	23°48'16.235"E
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