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 surface. Latitude measures angles in the north south direction and longitude measures angles in the east west direction ...
latitude-longitude
A reference system used to locate positions on the earth's surface. Distances east-west are measured with lines of longitude (also called meridians), which run north-south and converge at the north and south poles.
Assign latitude-longitude coordinates to address records.
Append demographic data to address records and summarize them in a report.
Append Tapestry Segmentation codes and summarize them in reports (optional add-on required).
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 ...
The module does not operate yet in latitude-longitude locations. It has not been thoroughly tested so not all option may work properly - but this was the intention.
SEE ALSO
r.flow, r.fill.dir, r.watershed
REFERENCES ...
Mathematical method for representing the shape of the earth on a flat plane; a formula that converts latitude-longitude locations on the earth's spherical surface to X,Y locations on a maps flat surface.
The geographic system (latitude-longitude), which is based on angles measured on a sphere, is not valid for measurements on a plane.
Geocoding is the process that assigns a latitude-longitude coordinate to an address. Once a latitude-longitude coordinate is assigned, the address can be displayed on a map or used in a spatial search.
The process of assigning geographic identifiers (eg, codes or geographic coordinates expressed as latitude-longitude) to map features and other data records, such as street addresses.
GIS ...
In some cases, users want to publish maps in multiple coordinate systems; typical example is a municipal environment that publishes a map in projected local coordinate system as well as latitude-longitude for mash-ups workflows ...
Much of this data are hard copy maps or tabular data sets that have a spatial identifier such as addresses and zip codes or X-Y values (latitude-longitude, state plane coordinates, or other coordinate system).
18 a structured set of measurements related to a specific spatial reference system; usually applied to pairs of distance measurements (X,Y) on independent axes of a planar reference system or to angular measurements such as latitude-longitude pairs ...
 See also: Longitude, Latitude, Location, Coordinate, Geographic
  
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