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Encyclopedia > GeoRSS

GeoTagging, sometimes referred to as Geocoding, is the process of adding geographical identification metadata to various media such as websites, RSS feeds, or images. This data usually consists of latitude and longitude coordinates, though it can also include altitude and place names. Geocoding is the process of assigning geographic identifiers (e. ... Metadata (Greek meta after and Latin data information) are data that describe other data. ... For RSS feeds from Wikipedia, see Wikipedia:Syndication. ... Latitude, usually denoted symbolically by the Greek letter phi, , gives the location of a place on Earth north or south of the equator. ... Longitude, sometimes denoted by the Greek letter λ (lambda),[1][2] describes the location of a place on Earth east or west of a north-south line called the Prime Meridian. ... See Cartesian coordinate system or Coordinates (elementary mathematics) for a more elementary introduction to this topic. ... Altitude is the elevation of an object from a known level or datum. ...


Geocoding also refers to the process of taking non-coordinate based geographical identifiers, such as a postal address, and converting them into geographic coordinates.


GeoTagging can help users find a wide variety of location-specific information. For instance, one can find images taken near a given location by entering a latitude and longtitude into a GeoTagging-enabled image search engine. GeoTagging-enabled information services can also potentially be used to find news, websites, or other resources.

Contents

GeoTagging in tag based systems

There exist a variety of techniques for adding geographical identification metadata to an information resource. One convention established by the website called GeoBloggers, encourages users to add tags to their Flickr images and del.icio.us bookmarks, enabling them to be found via a location search. Both Flickr and del.icio.us allow users to add metadata to an information resource via a set of tags, see folksonomy. Flickr is a photo sharing website and web services suite, and an online community platform, which is generally considered an early example of a Web 2. ... The website del. ... A folksonomy is a collaboratively generated, open-ended labeling system that enables Internet users to categorize content such as Web pages, online photographs, and Web links. ...


The convention established by GeoBloggers uses three tags to geotag an information resource:

  • geotagged
  • geo:lat=latitude e.g. geo:lat=51.4989
  • geo:lon=longitude e.g. geo:lon=-0.1786

where latitude and longitude are the geographic coordinates of a particular location. These are expressed in decimal degrees in the WGS84 coordinate system, which has become something of a default coordinate system with the advent of GPS. geotagged is the value of a keyword (commonly referred to as a tag, see folksonomy) that can be used to indicate that an information resource has been assigned an associated geographic position by the use of additional tags, a process known as GeoTagging. ... Latitude, usually denoted symbolically by the Greek letter phi, , gives the location of a place on Earth north or south of the equator. ... Longitude, sometimes denoted by the Greek letter λ (lambda),[1][2] describes the location of a place on Earth east or west of a north-south line called the Prime Meridian. ... WGS 84 is the 1984 revision of the World Geodetic System. ... Over fifty GPS satellites such as this NAVSTAR have been launched since 1978. ...


Using three tags works within the constraint of having tags that can only be single 'words'. Identifying geotagged information resources on sites like Flickr and del.icio.us is done by searching for the 'geotagged' tag, since the tags beginning 'geo:lat=' and 'geo:lon=' are necessarily very variable.


A further convention proposed by FlickrFly adds tags to specify the suggested viewing angle and range when the geotagged location is viewed in Google Earth: Google Earth is a free-of-charge, downloadable virtual globe program. ...

  • ge:head=xxxx e.g. ge:head=127.00, where xxxx is the view heading in decimal degrees (0-360) where zero is looking North.
  • ge:tilt=yyyy e.g. ge:tilt=60.00, where yyyy is the view tilt angle in decimal degrees, where 0 is looking straight down and 90 is looking horizontally from ground level.
  • ge:range=zzzz e.g. ge:range=560.00, where zzzz is the range of the viewpoint in metres from the marker location.

Geotagging websites is done with a meta tag, such as <meta name="geo.position" content="44.345;-93.712">. metre or meter, see meter (disambiguation) The metre is the basic unit of length in the International System of Units. ...


Microformat

The Geo microformat [1] allows co-ordinates within web pages to be marked up in such a way that they can be "discovered" by software tools. A proposal is in hand [2] to extend it to cover other bodies, such as Mars and The Moon This article may be confusing for some readers, and should be edited to enhance clarity. ... Note: This article contains special characters. ... For other moons in the solar system see natural satellite. ...


See also

It has been suggested that this article or section be merged into Geotagging. ... A Geocache in Germany Geocaching is an outdoor treasure-hunting game in which the participants use a Global Positioning System receiver or other navigational techniques to hide and seek containers (called geocaches or caches) anywhere in the world. ... A geographic information system (GIS), or more commonly referred to as a geospatial information system is a system for capturing, storing, analyzing and managing data and associated attributes which are spatially referenced to the earth. ... GPS satellite in orbit The Global Positioning System (GPS), is the only fully-functional satellite navigation system. ... Tagging is a term used in a number of contexts for different purposes, mostly referring to adding a tag of some form. ... Above: Map showing photographers view () of two buildings at a distance of 270 meters () and 1200 meters (). Below: Which of the three locations should be associated with the resulting photo? Assisted GeoTagging inside of Zooomr Geocoded photos are images which are associated with a geographical location. ...

External links

  • "Location, Location, Location" Wall Street Journal

 
 

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