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Building Maker: 3D model of Venice

For those who still had not seen, we must point out that this is the model in Google Earth 3D Venice. What I do not know is that this amazing work was created, more than a year ago, volunteers distributed around the world who have lent their works for free, using the Building Maker.

Entering Building Maker, we can see the list of cities in the archive with regard to Italy. For now it is Florence, Milan, Venice, that have been completed, and L'Aquila, which is work in progress.

The pictures below show, surrounded by a white line, the areas covered by aerial photos "slanting" of the four Italian cities.

Florence


Milan


Venice


L'Aquila (the blue dots are the buildings made to date, February 13, 2011 - compare them with those of a month ago )

But how does the process of an entire city? As you may be able, within a reasonable timeframe and with minimal expense by Google, to carry out the photogrammetric survey of areas so extensive and complex, allowing users to volunteer to work on the net?

The mechanism that Google engineers have built incredible, it consists of several components that now describe. The first component is

Building Maker, we have already seen in other posts of this blog. It allows you to view aerial photos "slanting" of the building selected, so that inserting overlay these photos predefined objects such as boxes, solid extrusion, pyramids and other objects, all with mutual links, that is "stuck" and stacked or side by side, they can best describe the building as possible, at a certain level of detail.


summits designed the building are "bound" by the user to the corresponding items of the photos, and finally, a complex algorithm on the server deals with Google to resolve the calculations of return perspective and re-projecting Photos on the model, so it can be viewed on Google Earth.

The second component of the process is 3D Warehouse, which is the repository of the models created by all Google users. This is the store where they end up, organized and searchable, all the works of three-dimensional composition of all users, from the hammer to the cabinet, the human character of the car, the architectural design of the bottle.



All that can be modeled in 3D can be incorporated into the 3D Warehouse, because it is secure and available to everyone.

The third component of the process is Google SketchUp. As we know, this is an exceptionally intuitive 3D modeling program, which Google provides for free.



Using SketchUp The building model created automatically and placed in Maker Building 3D Warehouse, can be modified to add details and details, being able to add windows, chimneys, dormers and other objects are difficult to create Building Maker. The level of detail can also go to the definition of gutters or rails, but we must keep in mind that you should weigh the model, because it can be represented in Google Earth.

Building Maker is the limit in the availability of aerial images "oblique." To try to overcome this problem, Google has set up a web page to request inclusion of a city of your choice list of those available for Building Maker.



Once you have entered a request, it is voted on by users, and when you reach a certain threshold level of criticism, Google may take into consideration the fact that a plane take off and take pictures. This is what happened to L'Aquila.

BobMaX

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