Hi Hendrik, some hints to get you started:
first of all, you probably want to generate thumbnails of your photos and load these into the map instead of the large-size images you are using now. This gives you a much better performance. The popup can then contain a link to the full-res version of the photo. Extracting EXIF/GPS metadata from JPEG images in Javascript is possible, but quite hacky and out of OpenLayers' scope. There is a Javascript library of Jacob Seidelin that does that ( http://blog.nihilogic.dk/2008/05/reading-exif-data-with-javascript.html), but it comes with the downside that you have to download all hi-res versions of the photos to the browser in order to get the gps coordinates contained in the exif metadata. A better approach would be to dump out the GPS coordinates of the photos into a JSON file, and load that file into OpenLayers with an AJAX request. You can then specify an Openlayers.Format that parses this information and creates a feature for each of your photo. You can use the exiftool command line utility ( http://www.sno.phy.queensu.ca/~phil/exiftool/) to quickly dump out all GPS coordinates into a JSON structure, see the reading examples page ( http://www.sno.phy.queensu.ca/~phil/exiftool/exiftool_pod.html#reading_examples) for more information. regards, Franz 2011/8/16 Hendrik Oesterlin <[email protected]> > Hello, > > I am trying to display geotegged photos in an OpenLayers overlay in an > easy way. > > I there a function that reads all jpg from an folder (or from a .txt > list of individual paths) and puts them on the right spot depending on > GPS position stored in EXIF data? > > Please find a sample photo here: > > www.oesterlin.ile.nc/div/DSC01090.JPG > > I'm avare that I could achieve this using some code like this: > > var Photos = new > OpenLayers.Layer.Text("Photos",{location:"data/photos.txt", projection: > epsg4326}); > map.addLayer(Photos); > > and the photos.txt file like > lon lat title description icon iconSize > 166.859902 -22.231191 Chutes de la Madeleine <html><img > src="data/DSC01090.jpg" width="480" height="640" border="1"/><br>photo > DSC01090.jpg</html> data/DSC01090.jpg 18,15 > > but was unable to figure out how to make the pop up bigger to fit to > the photo, and how to make a little X in the pop up to close it in an > intuitive manner. > Additionnaly, it is not convenient to add the lat lon by hand to the > text file for each photo. > > Find an test version here: > http://www.oesterlin.ile.nc/test/20110816test-carte.html > > Thank you for every hint! > > Regard > Hendrik > > _______________________________________________ > Users mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/openlayers-users >
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