[KPhotoAlbum] Geotagging and searches within KPhotoAlbum

[Mark Eichin]

Another use case: User (waves) has a subset of kphotoalbum pictures
synced to flickr, and has them geotagged there, and wants to pull the
geographic metadata back.  (Not really distinct at the tech level, but
perhaps emphasizes that you've got two (or more) separate problems -
how to add geotags to pictures, how to display geotagged pictures, and
how to search based on geotags...)

On Sun, Feb 22, 2009 at 2:04 PM, Walter Francis <wally at theblackmoor.net> wrote:
> I asked Jan about Geotagging in KPA today on IRC and he suggested I start a
> bit of a discussion on the matter on this list to describe some use cases and
> get additional input, so anyone feel free to jump in here!
>
> Some very limited number of cameras have built-in GPS units, some other
> cameras have optional GPS units which can be attached.  In either scenario,
> the images taken with the cameras are tagged with EXIF data indicating their
> latitude, longitude, typically altitude, datum, etc..  I haven't yet heard
> anything suggesting GPS will become a common built-in feature in cameras.
>
> Similar, but using separate processes, there are also methods to combine
> information from a GPS with information from a digital photo and geotag the
> images later.  Correlating the DateCreated (or perhaps other timestamps) from
> the photo and looking for the closest datapoint from a GPS data file, one can
> then write the GPS tags into the EXIF data.  There are several ways to do
> this, some of them online, some of them scripted, some minimal GUI, etc.
>
> See here for more info on geotagging:  http://en.wikipedia.org/wiki/Geotagging
>
> I have some following example use cases and suggested implementation ideas for
> both tagging and then referencing the data after.
>
> Use case 1:
> User does not have a GPS, but wishes to geotag their images for future
> reference within KPhotoAlbum
>
> Possible implementations/options:
> KPA displays a map from online data (ex: Google Maps) and allows click-to-pick
> spot.  Must be able to zoom in, display sat/hybrid.
>
> KPA displays Geolocation input in the Single and Multiple Edit Photo screens
> (lat, lon, perhaps even geolocation using online lookups to get lat,lon)
>
> KPA accepts a GPS datafile (kml, gpx, nmea(?)) and then looks for images
> within its database which match the GPS data and update the image EXIF and
> database with the data.  Will need time offset and time window (how long away
> is a valid time point) options.  Writing the EXIF data could be an option, but
> is necessary to make available for referencing external to KPA.
>
> Use case 2:
> User wishes to find all images within a certain area.
>
> Possible implementations/options:
> KPA displays Geolocation input in the Search screen (lat, lon, perhaps even
> geolocation using online lookups to get lat,lon)
>
> KPA allows you to search images near the current image you're viewing
>
> KPA displays a map and plots image points on the map.  This could be internal
> to KPA, or KPA could generate the data and launch it in a browser for viewing.
>
> Use case 3:
> User wishes to see the location of an image as he views it (single view,
> slideshow, etc).
>
> Possible implementations/options:
> KPA shows a small, simple map when viewing a single image, similar to the EXIF
> View popup.
>
> KPA displays Geolocation data in EXIF View popup (Image taken near City,
> State/Country)
>
> --
> Walter Francis
>
> khayts.us
> theblackmoor.net
> unlimitedphoto.com
>
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>



-- 
_Mark_ <eichin at thok.org> <eichin at gmail.com>