Meridian is:
Meridian (astronomy): an imaginary circle perpendicular to the horizon.
Meridian (Chinese medicine): an important concept in traditional Chinese medicine.
The Prime Meridian is the meridian (line of longitude) at which the longitude is defined to be 0°.
See Also: meridian
[ESRI software] In Survey Analyst for field measurements, any meridian that is parallel to the central meridian, used when computing points in planar rectangular coordinate systems of limited extent.
Meridians and Their Properties
All points on a meridian have the same solar, or local, time. Due to different day lengths throughout the year, correction formulas are applied to convert it to a local mean time.
meridian A line running vertically from the north pole to the south pole along which all locations have the same longitude. The Prime Meridian (0) runs through Greenwich, England.
Meridian: A line on the earth's surface which follows the shortest distance from pole to pole.
meridian -- a great circle on the Earth that passes through the geographic poles.
metadata -- data about the content, quality, condition, and other characteristics of data.
meridian
in a cartographic/geodetic context, a meridian is a line of longitude
met ...
Prime Meridian
The zero meridian, used as a reference line from which longitude east and west is measured. It passes through Greenwich, England.
Prime Meridian: The line of longitude that runs through Greenwich, England, used as the origin (zero point) for longitudinal measurements.
Pacific Meridian Resources, Inc.
The GIS Primer provides an overview of issues and requirements for implementing and applying geographic information systems technology. ...
Central Meridian
The meridian that passes through the poles and origin of an ellipsoid/sphere representing the earth and is used in calculations of a specific projection.
Central Processing Unit (CPU) ...
Meridians and base lines
Instructions
Show the boundary from information obtained from official sources
Show the boundary screen across all open water ...
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 °.
Meridians are equally spaced Parallels get closer near poles. Parallels are sines. True scale at equator. History ...
meridian
A meridian a circular arc of longitude that meets at the north and south poles and connects all places of the same longitude. The prime meridian (0 degrees longitude) passes through Greenwich, England.
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meridian - line of constant longitude ____________________ 1This definition of latitude does not hold on an allipsoid. See Robinson et al.
parallel - line of constant latitude ...
Meridian - See Longitude.
Metadata - Data about data or descriptions of the data in a data file, including date of collection, sources, map projection, scale, quality, format and custodian.
The meridian (line of longitude) passing through the Royal Greenwich Observatory, Greenwich, England; it is the meridian at which longitude is 0 degrees. It is often referred to as the Greenwich Meridian.
Prime Meridian
Greenwich, England
An Overview of Latitude and Longitude
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Central meridian and lines perpendicular to it
Central Clindrical
Classification: ...
The prime meridian divides the sphere into two hemispheres, the front hemisphere and the back hemisphere. What is the image of the back hemisphere under stereographic projection? The front hemisphere?
Distances are only correct along parallels and central meridian. Shapes become more distorted away from the central meridian and close to the poles. Slaking See wetting and drying.
Map makers have technical terms to describe the line of latitude or longitude where this imaginary 'piece of paper' touches the Earth. These are:
for a line of latitude - standard parallel
for a line of longitude - central meridian ...
Other projection mathods are based on more complicated flattenable projection surfaces, and instead of points of tangency, spacial cases of these projections can be made by adjusting their Standard Paraslells or Central Meridians ...
Another area in the Meridiani region is interesting because the light sedimentary units are topped by a dark unit (basalt?) which is now partially removed.
Graticule The designated grid of parallels and meridians on the earth and a map. Grid Data
One of many data structures commonly used to represent geographic entities.
Mercator projection, but is based on the idea of wrapping a cylinder around the sphere or ellipsoid (used to represent the earth) not touching the sphere at the equator, as in the normal aspect of the Mercator projection, but along a meridian.
system of imaginary 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 ...
A transverse cylindric projection uses a meridian of longitude as its central meridian. travelling salesman problem p.
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.
Data were extracted from several sources for the land east of the 100th meridian. Counties were chosen as the mapping unit because they are the reporting unit for many sources and are similarly sized in the East.
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.
Through each point, an east-west line, called a baseline, was marked on the ground, usually for many tens or hundreds of miles in both directions, and a north-south line, called a meridian or range, was similarly marked.
Longitude increases as you move away from the prime meridian, or 0°, in Greenwich, England. Because the lines of longitude converge at the poles, a degree of longitude represents a varying distance on the ground, depending on the latitude.
The UTM easting coordinate (the X coordinate) for a feature is the distance in meters east or west from the central meridian of the UTM zone.
There is a false origin defined at 400,000, -100,000 such that the central meridian is the Zero easting of the National Grid - which is also aligned to the 2 degree West meridian of Longitude. Additionally, the scale along the central meridian is 0.
Alexandria and Nicaea are on the same meridian. Alexandria is at about 31° North, and the region of the Hellespont at about 41° North; authors like Strabo and Ptolemy had fairly decent values for these geographical positions, ...
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.
Cylindrical Equal-Area projections have straight meridians and parallels, the meridians are equally spaced, the parallels unequally spaced. There are normal, transverse, and oblique cylindrical equal-area projections.
This line is known as the ‘central meridian' and is the only line within the zone that can be drawn between the poles and be perpendicular to the equator (in other words, it is the new ‘ ...
Put another way: UTM projection is used to define horizontal positions world-wide by dividing the surface of the Earth into 6 degree zones, each mapped by the Transverse Mercator projection with a central meridian in the center of the zone.
It is also necessary to select one particular semi-circular arc connecting the two poles to serve as the prime meridian for the system. The circle that lies halfway between the poles is called the equator.
David Eagle from Dotted Eyes (UK) will discuss the Ordnance Survey Meridian 2 data production process
Nadia Namini from the City of Calgary will discuss geomatics and FME from a corporate perspective.
See Also: celestial sphere, meridian, zenith
[aerial photography] In aerial photography, the point on the ground vertically beneath the perspective center of the camera lens.
> Magellan's GPS 2000 XLTM, GPS 3000 XLTM, Meridian XLTM, NAV DLX-10TM, NAV 1200XLTM, NAV 6000TM and NAV 6500TM marine GPS receivers are proving to be invaluable aids in both recreational and commercial boating and sailing.
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.
2572221 ** Datum Point Triangulation Station NONE MEADES RANCH (Mass-center of Earth) Longitude Origin Greenwich Meridian SAME (BIH Zerio Meridian) Adjustment 25,000 Points 250, ...
This coordinate system is formed by creating a grid using the equator as 0 degrees and forming parallels of latitude to the north and south (90 degrees N is the North Pole, 90 degrees S is the South Pole), and meridians of longitude east and west ...
When a cone or cylinder is cut along any meridian to produce the final projection, the meridian opposite the cut line is called the central meridian. Planar projections may be oriented in different ways: polar, equatorial and oblique.
A four-sided figure, bounded by parallels of latitude and meridians of longitude, used as an area unit in mapping. A well-known map series is the USGS 7.5-minute topographic quadrangle. Each map in this map series covers 7.
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.
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.
A projection in which latitude lines are parallel but meridians are curves.
SEE ALSO: Cylindrical Projection, Eckert IV Projection, Eckert VI Projection, Mollweide Projection, Robinson Projection, Sinusoidal Projection
REFERENCES: ...
Longitude (Long): 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.
The Prime Meridian and Equator serve as base references for establishing the angular movements expressed in degrees of Longitude (X) and Latitude (Y) of an imaginary vector from the center of the earth passing through any location.
Longitude: Angular measurement east and west from the prime meridian
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paradigm IT offers backoffice services in civil/structural engineering and geographical engineering and information systems.
r.tileset does not know about meridians that "wrap-around" in projections.
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Cedric Shock
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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.
A coordinate system is usually defined by a map projection, a spheroid of reference, a datum, one or more standard parallels, a central meridian, and possible shifts in the x- and y-directions to locate x,y positions of point, line, ...
 See also: Map, Projection, Area, Latitude, Surface
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