False northing 0.0
False easting 1000000.0 (one million meters)
Except for Geographics, all map projections (including both UTM and BC Albers) introduce distortion when representing features from the curved surface of the earth onto a flat map.
false northing
The linear value added to all y-coordinates of a map projection so that none of the values in the geographic region being mapped are negative.
False Northing, y coordinate of map origin
k0, scale
Scale factor at central meridian [0.1, 10]
lam0
Central meridian, longitude of map origin (-180, 180)
phi0
Central parallel, latitude of map origin or of true scale (-90, 90)
phi1, phi2 ...
All zones have their origin at the equator, use the meter as the system unit, and have a false easting of 500,000 meters and a false northing of 0. A scale reduction factor of 0.9996 is used on all zones.
The second parameter is the false northing - a linear value applied to the origin of the y-coordinates - or the equator. The final parameter used in a UTM grid system is a fixed parameter called the scale factor.
However, false eastings and false northings are frequently used, which effectively offset the origin to a different place on the coordinate plane. This is done in order to achieve several purposes: ...
If they are negative, you'll have to add a large offset to each value (creating a False Easting and False Northing). ArcGIS doesn't like negative numbers, and you'll get a "Warning: Inconsistent Extent" message if you try and open the XY coords.
Projection type Transverse Mercator Reference ellipsoid GRS80 Datum/reference frame ITRF2005 Central meridian 11[degrees] 20' Scale factor at central meridian 1.0 False Northing 0.0 meter False Easting 1,000,000.
[ESRI software] In ArcGIS, a parameter that offsets the z-origin from the surface of a vertical coordinate system. The vertical shift is similar in effect to the false easting or false northing parameters of a projected coordinate system.
UTM Zones
Eastings are measured from the central meridian (with a 500km false easting to insure positive coordinates). Northings are measured from the equator (with a 10,000km false northing for positions south of the equator).
UTM Zone 14 ...
Sometimes false northing is needed which is coded as "+y_0". Internally, the underlying PROJ.4 projection library performs an inverse projection to latitude-longitude and then projects the coordinate list to the target projection.
The false origin is offset so that the central meridian is at 500,000 metres east. The false Northing is zero metres in the northern hemisphere and 10,000,000 metres in the southern hemisphere. The scaling factor on the central meridian is 0.99960.
in the northern hemisphere, and 10,000,000 for quadrangles in the southern hemisphere. Since the distance from poles to Equator is approximately 10,000 km, such offset origins ensure coordinates (called false eastings and false northings) are ...
In our Data Frame Proeprties modify the coordinate system properties, Changing the False Easting to 0, and the False Northing to -143000. This basically shifts our coordinates closer to the origin.
Each zone has its own central meridian and false origin to the south and west of the zone. Coordinates are represented by the false easting and false northing measured in feet, followed by the state and zone.
drawn through the center of each grid zone (and given an arbitrary easting of 500,000 meters). In the northern hemisphere, northings are read in meters from the equator (0 meters). In the southern hemisphere, the equator is given the false northing ...
 See also: Coordinate, Easting, Projection, Map, Surface
|
