Geographic Coordinate System |
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Geographic Coordinate Systems
The geometry of the earth has been discussed, studied, and imagined forever. The ancient Greek philosophers tried to picture a pure geometrical model.
Geographic coordinate system
Universal Transverse Mercator coordinate system
Map Projections. USGS Publications. December 2000.
Elements of Map Projection. (26 MB download) U.S. Coast and Geodetic Survey, Special Publication 68 (1938).
Geographic Coordinate System . . .
One of the most common coordinate systems in use is the Geographic Coordinate System, which uses degrees of latitude and longitude to describe a location on the earth's surface.
Under 'Geographic Coordinate Systems', select NAD83 (EPSG:4269) and click 'OK'.
If desired, add the data source information and layer name then click 'OK' to generate the shapefile. You will receive a message saying the vector file has been saved.
See Also: geographic coordinate system
[coordinate systems] A reference system using positions of latitude and longitude to define the locations of points on the surface of a sphere or spheroid.
There are other geographic coordinate systems in common use. You may find that they are well suited to your needs and easier to use than lat/lon. Refer to the page on Selecting a Geographic Coordinate System for a comparison of different systems.
Geocoding
GIS
Geographic coordinate system i.e longitude / latitude, point system
[edit] External links ...
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.
Relative Position refers to the location of features in relation to a geographic coordinate system.
Reprojecting Grids The rasters downloaded from the USGS site are use a geographic coordinate system that uses x and y units are decimal degrees of longitude and latitude.
USAGE: grid spacing color color numbers # [color] cross cross size font font name fontsize font size width # end The spacing of the grid is given (in the geographic coordinate system units) on the main instruction ...
Contents > Map projections > Getting started with map projections > An overview of map projections Geographic coordinate systems (all topics) Projected coordinate systems (all topics) Geographic transformations (browse all topics) Supported map ...
The Geographic Coordinate System places a three-dimensional grid system over the Earth's surface and locations are determined relative to two coordinates: latitude and longitude.
It is normally expressed as metres above mean sea level and is referenced to geographic coordinate systems using latitude and longitude or to plane coordinate system such as the Universal Transverse Mercator System using metres.
Files are referenced and transformed according to the defined geographic coordinate system
Work with the native format - import or reference, edit, print, query, identify, overlay, and more
No special licensing required ...
Sparing a long discussion of the attributes of different projections, I recommend choosing a geographic coordinate system that is appropriate for your task.
Before any GIS graphic data layers will be ready for overlay functions, the layers must be referenced to a common geographic coordinate system.
Position
An exact, unique location based on a geographic coordinate system.
Position Fix
The GPS receiver's computed position coordinates.
Additionally, the GLCF SRTM files are available in both the native geographic coordinate system and in UTM coordinates.
As we noted in Sections 10 and 11, maps in general nearly always have the following, essential information: graphic distance measures, scale, orientation and direction, projection type, and some geographic coordinate system, ...
 See also: Coordinate system, Coordinate, Geographic, Map, Information
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