On Oct 2, 2006, at 7:24 PM, Kevin Marks wrote:
On Oct 2, 2006, at 3:16 PM, Chris Casciano wrote:
You could outline any territory as a series of geos if the need
ever arose. But I'm still not clear how we've gotten here. If I
want to say something is in Ireland, or Mexico City or somewhere
in the Alps I'd tag it as such. I thought the original issue of
accuracy was one of precision (either via tool measurement or in
human recollection).
Not one of being able to define a "geo" that accurately represents
the floorplan of Yankee Stadium or the whole of Antarctica but of
accurately reflecting if a designation was accurate enough to make
a determination if a specific seat in yankee stadium, "somewhere
in the bleechers", or just "near the stadium as i was walking
around before the game" or "i need to mark the bronx somehow so
left me zoom out and drop a marker from the 50k foot view"
http://flickr.com/map/?
&tag=yankeestadium&fLat=40.828081&fLon=-73.920821&zl=7
Notice that the yankeestadium tag shows various usages here - the
ambiguity between where the photo was taken from and what it was
taken of.
You could probably derive a useful 'centrepoint + radius' for
Yankee stadium from the mean and std-dev of those geolocated,
tagged points.
Notice that the URL I used above has 6 digits of latitude and
longitude (a supposed precision of ~ 10cm), but a zoom-level
parameter to express the actual display I wanted to convey.
However, what you see is dependent on the size of your browser
window, as the zoom-level is defined based on pixel-size, not
window width.
I think its also important to note (if you weren't on IRC when this
came up) that precision in this case isn't only a factor of zoom, but
also one of someone marking a photo at their location or the subjects
as well as their accuracy of remembering (or caring to place) the
location accurately and dropping that very precise marker in the
proper spot. Mix that with some highly precise data that may come
from cameras with supplied GPS data and you can see where maybe
dealing with different size blobs rather then specific points might
better represent the data.
An interesting discussion all around I think... but do we have any
sites actually taking any of this into account when users tag
objects? Did I miss some examples of [at least] taking zoom factor
into account?
--
[ Chris Casciano ]
[ [EMAIL PROTECTED] ] [ http://placenamehere.com ]
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