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GeoTagging

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Revision as of 23:32, 5 April 2009

Contents

What

A user wants to annotate a person, place or thing, with a geographic tag. Usually in the form of lat/long, the information is often translated into an address that can be placed on a map.

flickr photos on a map
flickr users can place and view their photos on a map.

Use When

Use this pattern when you want to place objects (people, places or things) on a map.


How

If the item is a photo and there is exif data which includes lat/long, associate that location string with the object.

Automatically place the item on a map.

If the item has an address associated with it, like a business, automatically place the item on a map.

Allow the user to associate an address with an object.

Place on a map
Adding a photo to a map on flickr through selection on a map. Lat/long coordinates are presented in the lower right of the interface.

Consider allowing users to drag and drop items (photos, listings, friends) onto a map and associating a location with the item.

Allow the user to refine the location by offering an address form. Allow full address, city/state combo or even zip/postal code. Fields should be optional.

Allow users to enter specific latitude and longitude numbers indicating a point on a map, as an alternative to picking a spot on a map.

Use the emerging format for geo data:

  • geotagged
  • geo:lat=57.64911
  • geo:lon=10.40744

The first item is the tag “geotagged” allowing all items to be searched from a common tag. The other tags are geo:lat and geo:long which was established by Geobloggers and has been popularized by sites like flickr, Panoramio and delicious.

Clearly indicate how the information will be used.


Why

Offering Geo tagging capabilities to assets, particulary photos, allows them to not only exist in time but also in a context related to the real world. Placing images on a map give people a sense that this image really exists and if I went there I might see this too. Geo tagging also let's a person's network know that they were at this spot.


Related Patterns


As Seen On