Thanks to anyone who watched, and hope you found it useful.
So as promised attached is the final AdVIZture workbook, the original Excel data-source, and some of the links I referred to, below (+ a few things I didn't get time to cover!)...
GPS Visualizer: GPS Visualizer: Convert GPS files to plain text or GPX
EXIF Tool download: ExifTool by Phil Harvey
EXIF (non-techie!) instructions: Exporting GPS Data from a folder of images & writing to a CSV « TJ Houston.com
here are mine download -> copy EXIF.exe to folder with Photo's -> Open CMD Prompt -> type: "cd /d " then folder with photos path (eg. cd /d D:\Google Drive\Tableau\Public\My Daily AdVIZture\Images\In Transit Shots) -> Type: "exiftool -csv -filename -imagesize -gps:GPSLatitude -gps:GPSLongitude ./ > photo.csv" ->Hit enter...and voila .csv of meta data.
As an aside, if you rename the EXIF.exe to "exiftool(-a -u -g1 -w txt).exe" and then drag a file over...you get a text file (in that location) with all the meta-data (from any file type)...this will let you see what things are called so you can add to the .csv command above
What does N decimal places mean in terms of Longitude/Latitude accuracy (good to know to keep your data as light as possible!): lat lon - Measuring accuracy of latitude and longitude? - Geographic Information Systems Stack Exchange
TC14 Presentation, which among other things, shows how to hack/populate the XML with lots of background images (and link them to a dimension) in one go...totally at your own risk!: Post-Conference Materials | Tableau Conference 2014
Here is also a link to my blog, and community wiki posts, showing exactly how the 'Trump' trick works, and how you can use it to generate Action driven sheet-swaps;
single data-source: Sheet Swap with Action Filters...the simple version!
One other thing I didn't have time for was...one other thing to think about with shapes...on the destination shape, when I used the one from flatIcon
it did this...
as Tableau plots to the center of the image...in the attached I used paint.net to add a little extra canvas
and I get this...
...need to be a bit careful (as the tool-tip is triggered from the icon-canvas...so can happen a few mm before the user gets to the icon, from below). I include this more as, general principle of how you can use "the various tools/tricks at our disposal" to solve problems...