Longitude (pronounced /ˈl'nd'ɨtju˝d/ or /ˈl'ŋɡɨtju˝d/),[1] identified by the Greek letter lambda ("), is the geographic coordinate most commonly used in cartography and global navigation for east-west measurement.
longitude
See Also: great circle, latitude
[coordinate systems] The angular distance, usually expressed in degrees, minutes, and seconds, ...
Longitude
Lines of Longitude are Great Circles East and West of the Prime Meridian
From Amanda Briney, for About.com ...
Longitude
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Longitude
Lines of longitude, or meridians, run between the North and South Poles. They measure east-west position. The prime meridian is assigned the value of 0 degrees, and runs through Greenwich, England.
Using the world longitude and latitude map printout, answer the following questions and mark the locations.
1. Draw a red line along the equator (0 degrees latitude).
2. Draw a purple line along the Prime Meridian (0 degrees longitude).
Converting Latitude/Longitude to Universal Transverse Mercator (UTM)
On October 5th, 1996, I posted a request on sci.geo.geology and sci.geo.satellite-nav asking about conversion formulas between latitude/longitude and UTM coordinate systems.
Longitude
The longitude of a point on the earth's surface is given by the point's angular distance east or west of a pre-selected prime meridian. A semi-sircular arc running from the North Pole to the South Pole is called a meridian.
Longitude: Angular measurement east and west from the prime meridian
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Longitude - The angular distance, usually expressed in degrees, minutes, and seconds, of the location of a point on the earth's surface east or west of an arbitrarily defined meridian (usually the Greenwich prime meridian).
Longitude: The angle between the plane of a meridian and the plane of an initial meridian arbitrarily chosen (the Greenwich Prime Meridian). In Canada, this angle is commonly measured as the angle west of the Prime Meridian.
longitude -- angular distance between the plane of a meridian east or west from the plane of the meridian of Greenwich.
map -- a spatial representation, usually graphic on a flat surface, of spatial phenomena.
Longitude
The distance east or west of the prime meridian (measured in degrees). The prime meridian runs from the north to south pole through Greenwich, England.
Longitude:
A measure of distance east and west of a line drawn between the North and South Poles and passing through the Royal Observatory at Greenwich, England.
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Longitude - The angular distance, measured in degrees, cast or west from the Greenwich meridian, or by the difference in time between two reference meridians on a globe or sphere.
longitude
the east/west component of the spherical coordinate system most widely used to record geodetic locations. Lines of longitude are great circles/geodesics, which pass through the north and south pole, and intersect the equator.
Longitude: The second component of a spherical coordinate system used to record east-west positions on the earth's surface, ...
X is Longitude, Y is Latitude. Reversing these will give you very strange results.
Make sure that the 'Enabled' box is checked.
Longitude is the east or west location of a point, measured as an angle from the earth's center east or west of a prime meridian, a given point on the earth's surface at 0 degrees longitude.
Longitude is the angle measured at the centre of the earth eastwards (or westwards) from the Greenwich Meridian to the position of a point on the earth's surface.
Longitude values:
The full longitude values are centred (degrees and minutes) on the neatline extensions or ticks ...
Longitude
Defining longitude was much more difficult, as it is could not be based on observations of movement of the sun.
Longitude: -63.10774861954596
Latitude: 46.2899306519141
We now need a base map to plot our point on. In future articles we will generate this ourselves, however to start we will use a simple pre drawn JPG file.
longitude (l) - measures the angle on the equatorial plane between the meridian of the point and the central meridian (through Greenwich, England)
has range: -1800 (westerly) to +1800 (easterly)
Important Terms ...
Longitude
An east/west measurement of position in relation to the Prime Meridian, an imaginary circle that passes through the north and south poles.
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LONGITUDE
The angular distance of a point east or west of an arbitrarily defined meridian, usually taken to be the Greenwich meridian. The distance is measured with reference to an idealised, spheroid shape of the Earth.
Longitude is the system for determining location on the surface on the earth along a given east-west line. It is measured in degrees east or west of the prime meridian that runs through Greenwich, near London in England.
Longitude - The angle, measured on the plane of the Equator, between the position of a point on or above the Earth's surface and the reference meridian (i.e. 0o) that passes through Greenwich, England.
The longitude l is the angle between the meridian ellipse which passes through Greenwich and the meridian ellipse containing the point in question.
For longitude-latitude databases, the interpolation algorithm is based on degree fractions, not on the absolute distances between cell centers. Any attempt to implement the latter would violate the integrity of the interpolation method.
Doubled longitudes
Doubled horizontal scale
Noticing that an azimuthal equidistant map encloses an "inner" hemisphere in a disc whose radius is half that of the whole map, Aitoff proposed a very simple, yet attractive modification: ...
Lines of longitude, on the other hand, do not stand up so well to the standard of uniformity. Lines of longitude run perpendicular to the equator and converge at the poles.
latitude/longitude (Lat/Long) The fundamental geographic coordinate system, consisting of parallel lines of latitude circling the globe in an east-west direction and north-south lines of longitude (meridians) that converge at the poles.
Latitude-longitude ("Geographic")
Universal Transverse Mercator (UTM).
Here's an explanation of UTM: Mercator, Transverse Mercator, and Universal Transverse Mercator.
latitude-longitude
A spherical reference system used to measure locations on the Earth's surface. Latitude and longitude are angles measured from the Earth's center to locations on the Earth's surface.
meridians of longitude (X)
graticular network
Positions on a globe are measured by angles rather than X, Y (Cartesian planar) coordinates. In the image below, the specific point on the surface of the earth is specified by the coordinate (60 .
Latitude and longitude are easily estimated for any location, but elevation must also be provided to interrogate the interpolated climatic relationships. A digital elevation model was prepared by Zuo et al.
latitude and longitude on a sphere (or ellipsoid of revolution--more about that later) or
Cartesian coordinates (x, y).
Transverse (uses longitude as standard line) cylindrical projection
60 Zones
o United States Public Land Survey System ...
Meridian A line running vertically from the north pole to the south pole long which all locations gave the same longitude. The prime meridian runs through Greenwich, England.
Location may be annotated by x,y, and z coordinates of longitude, latitude, and elevation, or by such systems as ZIP codes or highway mile markers. Any variable that can be located spatially can be fed into a GIS.
Capabilities XML Service-level metadata describing the operations and content available at a service Cartesian coordinates Coordinates that differ from latitude-longitude coordinates in that the latter comprise a spherical (rather than ...
Geographical Coordinate System System that uses the measures of latitude and longitude to locate points on the spherical surface of the Earth.
60 coordinate transformation that converts latitude longitude measurements into planar coordinates. Projections can be based on a developable surface (such as a plane, cylinder, or cone) or on a mathematical function. proportional symbols p.
The Cartesian co-ordinate system and the system of latitude and longitude of the earth are examples of coordinate systems based upon Euclidean geometry.
lines on an adopted terrestrial or celestial datum surface. Also, the mathematical concept for such a system. For maps of the Earth, a projection consists of 1) a graticule of lines representing parallels of latitude and meridians of longitude or 2) ...
Satellite-Based Augmentation Systems SBAS SATELLITE ORBIT LONGITUDE PRN NO. NOTES EGNOS Inmarsat-3-F2/AOR-E 15.5[degrees]W 120 A, C Artemis 21.
BEGIN_USGS_DOQ_HEADER QUADRANGLE_NAME "NAPA" QUADRANT SW WEST_LONGITUDE -122 22 30.0 EAST_LONGITUDE -122 18 45.0 NORTH_LATITUDE 38 18 45.0 SOUTH_LATITUDE 38 15 0.
For example an aerial photograph may need to be stretched (orthorectified) using photogrammetry so that its pixels align with longitude and latitude gradations (or whatever grid is needed).
The circle on the left depicts a sphere with a radius r1 on which a coordinate system (essentially, latitude and longitude lines) has been traced. That describes expansion from an initial point (radius r0).
The Graphical Problem of Latitude and Longitude
Since Hipparchus described his system for referencing places on the earth why has humanity utilized so many diferent coordinate systems and variations on them?
The first type assigns latitude and longitude to a street address that has been matched to a street centerline or ownership parcel. These addresses can then be displayed as points on a map, or aggregated to larger areas (e.g.
A new geo-coordinate system conversion function (Edit/Geo Coord Convert/UTM and LL) to convert between UTM coordinate system and the latitude/longitude system. This function supports most geodetic datum used around the world.
Current Loran-C receivers track three or more transmitters to provide a position fix usually computed by the receiver and displayed as latitude and longitude.
Longitude is the number of degrees east or west of the prime meridian. Latitude runs from 0 to 90 degrees and longitude runs from 0 to 180 degrees.
The central meridian for UTM zone 10 (with boundaries at 120 west longitude and 126 west longitude) is 123 west longitude.
Step Three: Demographic Data—After Joe's record was geocoded with latitude, longitude, and census geography codes, demographic data can be added to reveal even more about "who" he is based on the profile of his neighborhood.
For longitude this was even worse, because there was no reliable method to determine geographic longitude; Ptolemy was well aware of this. It remained a problem in geography until the invention of chronometers at the end of the 18th century AD.
If the graticule of latitude and longitude are projected onto the cylinder and the cylinder unwrapped, then a grid-like pattern of straight lines of latitude and longitude would result.
In the resulting map the parallels become shorter with distance from the equator, and to maintain the right-angled intersections of the lines of latitude and longitude, the lines of longitude (meridians) are also drawn as parallel lines.
 See also: Latitude, Map, Information, Geographic, Location
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