Title: MapTube and Streaming Google Earth Sharing Data via Anonymous Servers
1 MapTube and Streaming Google Earth Sharing Data via Anonymous Servers UCL CENTRE FOR ADVANCED SPATIAL ANALYSIS Google Earth and Google Maps have changed the nature of sharing Geographical Information to such an extent that the ability to view data from a global to street level is now often taken for granted. Sharing data in Google Maps is not however an easy task it still requires significant skills in GIS. MapTube developed as part of the GeoVUE project aims to address this with a simple click through interface allowing users to share any data. In a similar way to YouTube the data is held on an external server opening up the possibility of a central map resource and data sharing. We preview MapTube in this seminar as well as detailing the latest work on Virtual London and Google Earth.
Richard Milton and Andrew Hudson-Smith
2 New Google Earth Features
Network links and LODs
eSociety ..\data\DUG-examples\eSociety\mapstest.km z
13.7MB 10921 files
Virtual London ..\data\DUG-examples\Westminster.km l
3.3GB 2337 files
3 The Maptube Idea
Publishing geospatial datasets on the internet requires a map to put the data on.
Using Google Maps data can be hosted legally.
Building custom tile layers for Google Maps that render data on the fly requires code that executes on the server and can be very slow.
Most users do not have access to a programmable server e.g. ISPs and Google Pages.
So why not pre-render all the tiles remove the programmable server component speed up the map rendering and give everybody the ability to host geospatial data on their own website
Because there are a lot of tiles (274877906944 at zoom level 19)
but data tends to fall into one of two categories small scale or large scale for example GPS tracked pollution levels at a 5 metre resolution or crime data for London councils.
So why not create an application that can automatically create a Google Maps website from a shapefile and that allows the user to control the number of tiles by limiting either the zoom level or the geographical area
GMapCreator demonstration of OAC website creation
OAC-London ..\data\DUG-examples\OAC\oac-super.htm l
Some buildings ..\data\MapTube\LC_TQ1268_height_d ata_product_v1.html
5 MapTube - Sharing Data
Allow users to upload their shapefiles and let us host their data but users can still use the tool to create and host their own data the best of both worlds
By holding the data on our server in a raw format we have the potential for combining datasets. This might raise some legal issues.
If the service becomes popular we are going to need a bigger server.
6 Hardware 7 Rich Web Pages
Google Web Toolkit
Point-based data and clustering ononesite and eSociety
GPS Tracking and GPX
Linking 2D and 3D
Fade data in and out
8 Point Data
The clustering algorithm must be representative
The pin limit causes problems when panning
Live Demo http//localhost8080/googlemaps/esocie ty2.html
9 Weather Data Synoptic Data
Weather data is shown drawn around a station circle
Wind direction is indicated by the arrow and speed by the number of fleches
Symbols on the left show weather conditions e.g. rain
Pressure temperature and dewpoint are also displayed
10 Fading Data
Problem the data completely obscures the map or is hard to understand if transparent
Fade the data or the map
Alpha channel in png
Live demo ..\..\share\opacitytestcensus\erg_OA_20 01_ks01ks02ks15_percentage_WGS84.html 11 Linking Google Maps and Google Earth
Google Earth is an ActiveX object
Follow a GPS track around Virtual London
Live Demo ..\..\share\Tracking3D\GPXViewer3D.html 12 Pollution Tracking A cyclist with a GPS and carbon monoxide sensor was tracked cycling around Bristol. The data is published on the web as an animated track using Google Maps. Live demo http//www.casa.ucl.ac.uk/ bbc/dontdieyoung/log_25-09-2006_154206.html 13 Conclusion
PowerShow.com is a leading presentation/slideshow sharing website. Whether your application is business, how-to, education, medicine, school, church, sales, marketing, online training or just for fun, PowerShow.com is a great resource. And, best of all, most of its cool features are free and easy to use.
You can use PowerShow.com to find and download example online PowerPoint ppt presentations on just about any topic you can imagine so you can learn how to improve your own slides and presentations for free. Or use it to find and download high-quality how-to PowerPoint ppt presentations with illustrated or animated slides that will teach you how to do something new, also for free. Or use it to upload your own PowerPoint slides so you can share them with your teachers, class, students, bosses, employees, customers, potential investors or the world. Or use it to create really cool photo slideshows - with 2D and 3D transitions, animation, and your choice of music - that you can share with your Facebook friends or Google+ circles. That's all free as well!
For a small fee you can get the industry's best online privacy or publicly promote your presentations and slide shows with top rankings. But aside from that it's free. We'll even convert your presentations and slide shows into the universal Flash format with all their original multimedia glory, including animation, 2D and 3D transition effects, embedded music or other audio, or even video embedded in slides. All for free. Most of the presentations and slideshows on PowerShow.com are free to view, many are even free to download. (You can choose whether to allow people to download your original PowerPoint presentations and photo slideshows for a fee or free or not at all.) Check out PowerShow.com today - for FREE. There is truly something for everyone!