AutoCAD Map 3D General Discussion

AutoCAD Map 3D General Discussion

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Valued Contributor
frosty1_4me
Posts: 67
Registered: ‎11-13-2006
Message 1 of 4 (2,313 Views)

False Northing and Easting in Coordinate

2313 Views, 3 Replies
03-25-2013 11:19 AM

Hi,

 

I'd like to know what the point of the false northing and easting is as it's defined in some coordinate systems.  My understanding was this was an issue many years ago so that any coordinate values that were extracted for use in a db would be positive values.  However, I'm not sure that is an issue any longer for most applications so is there any point to using a coordinate system with those values? 

 

Thanks.

*Expert Elite*
antoniovinci
Posts: 1,703
Registered: ‎06-03-2011
Message 2 of 4 (2,301 Views)

Re: False Northing and Easting in Coordinate

03-25-2013 12:37 PM in reply to: frosty1_4me

False Easting starts from the "central meridian", while I've never heard about a False Northing, sir.

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jens.kuegl
Posts: 20
Registered: ‎07-25-2011
Message 3 of 4 (2,288 Views)

Re: False Northing and Easting in Coordinate

03-26-2013 01:15 AM in reply to: frosty1_4me

Of course False Northing and False Easting are used today. They are part of the definition of a coordinate system.

 

False Northing starts from the "equator". Often False Nothing is equal 0. Exampe: y-coordinate of Berlin (Germany) in UTM 32N is: 5,819,000. In UTM32N False Norting is equal 0. So the distance from Berlin to the eqautor is 5,819,000 meters.

 

 

Valued Mentor
fieldguy
Posts: 376
Registered: ‎03-31-2005
Message 4 of 4 (2,268 Views)

Re: False Northing and Easting in Coordinate

03-26-2013 07:09 AM in reply to: frosty1_4me

False eastings and northings are sometimes used in projections in order to make all of the x and y values across the data area positive numbers.  They can also be used to adjust positions for alignment purposes.  They can also be used to reduce the range of values.  If all of the y values are greater than 5,000,000, a false northing of -5,000,000 could be applied.

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