[gdal-dev] Projecting images with HTML5 Canvas in the web-browser

[Mano Marks]

That's awesome!

Mano Marks
Geo Developer Advocate
http://twitter.com/ManoMarks




2009/10/25 Klokan Petr Přidal <klokan at klokan.cz>:
> Hi everybody,
>
> on Saturday during the Code Sprint of the FOSS4G 2009 conference in
> Sydney we have made quite interesting step forward in the web
> cartography.
> With the help of other open-source developers I put together a
> prototype of the client-side map reprojection implemented only in
> JavaScript (using HTML5 Canvas tag and the Proj4js JavaScript
> library).
>
> An image as JPEG, PNG or GIF is with JavaScript in a web-browser
> warped into a different map projection.
> The example is reprojecting the world image into the Spherical
> Mercator (map projection of Google Maps), into the map projection used
> in US National Atlas, into Canada LCC and into the Mollweide
> projection (used by National Geographic for thematic mapping).
>
> To try it you need any web browser which supports HTML5, it means the
> latest version of Firefox, Chrome, Safari or Opera.
>
> Have a look at the demo:
> http://examples.maptiler.org/map-reprojection-html5-canvas/
>
> It is just a prove of concept in this moment, but I am sure practical
> applications will follow.
>
> The most typical use could be the client-side warping of raster data
> (weather forecast, ..) into the correct image overlay of Google Maps
> and similar online maps.
> Any WMS sever providing only EPSG:4326 can now correctly overlay
> Google Maps, if somebody use this technique to prepare the mash-up. Of
> course the speed can be an issue in this moment, but there is plenty
> of space for improvement in the warping code, and it can be done in a
> separate computing thread, which is possible with HTML5 Web Workers...
>
> Best,
>
> Klokan Petr Pridal
> --
> http://blog.klokan.cz/
> http://www.maptiler.org/
> http://www.oldmapsonline.org/
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