[uf-discuss] Geo precision
ben at benedictoneill.com
Wed Aug 29 15:08:12 PDT 2007
>> On 8/27/07, Ben Ward <lists at ben-ward.co.uk> wrote:
>>> Since then the only additional information I've found is that Flickr
>>> stores accuracy (as an integer) based on the zoom level of the map
>>> when you place a photo. In fact, if you zoom all the way out and
>>> place a photo you'll get a notice warning you that the location is
>>> too approximate and the photograph won't show up at higher zoom
>> I've been doing some work with Google's geocoder, encoding addresses
>> into co-ordinates for mapping purposes.
>> Google uses an 9-point enum that is specified as a
>> human-understandable scale rather than specific geographical terms:
>> 0 Unknown location.
>> 1 Country level accuracy.
>> 2 Region (state, province, prefecture, etc.) level accuracy.
>> 3 Sub-region (county, municipality, etc.) level accuracy.
>> 4 Town (city, village) level accuracy.
>> 5 Post code (zip code) level accuracy.
>> 6 Street level accuracy.
>> 7 Intersection level accuracy.
>> 8 Address level accuracy.
Flickr uses a 16 point system:
- World level is 1
- Country is ~3
- Region is ~6
- City is ~11
- Street is ~16
This is taken from the Flickr API <http://www.flickr.com/services/api/
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