Everyone can experience real
like 3D street view experience on the Google Map/Bing Map.
here i explained how 3D view are brought to you.
When
you are about to get the detail on Google Map, you first tries to
explore the Map view, after that you can switch the satellite view. And the
most real experience you can get ever is by 3D street view. You can Navigate
360 Degree on map and even get the object detail even closer with your
navigation. Not only Google, Microsoft are also
now sending the team equipped with ultra camera’s and sending collecting even
better image. In this Post I’m going to tell you how Street maps are made and
what are the steps involved in it.
Here
are steps involving in shooting the image and making it appear on your Map
Shooting 3D Images for Goolge/Bing maps
Firstly
a street car is sent to the location in between 10 am to 2 pm and when weather
and lighting condition is good. This car is mounted with Ultra camera’s of 12
MP each in each direction. This perfection works on Ladar Technology.
Ladar
(Light Detection and Ranging) sends the laser signal to every direction and
estimate the distance and make it compatible with distance. Also this car mainly
collect three data, GPS location of the Car, Photo, and Laser enhanced distance
measurement. Photos from all the direction are taken and due to work of Ladar,
the real effects are possible to create in your browser. In normal narrow city
road, these cams shoot at every 4m of distance and an average of 250 Panorama
picture from 1500 individual pictures.
In
this way one street view shoot occupy almost 16 MB of data, these data in HDD
are than send to the data center for further processing. These data center
processes almost of 50-100 TB of data/Week.
Data Processing: From panorama image to complete cube
After
shooting the images, (in Microsoft’s Case) these images are combined, say
mainly 6 images are taken as each side of the cube and Microsoft uses its own
developed code to combine them, this software is known as Photosynth. This
software detect the similar objects in cube and join them, it also adjust the
brightness and light level of two different images. These cubes are produced in
different quality for browsing in different devices.
Due
to this much of effort behind the quality, you need to have advance plug-ins
like flash or HTML 5 in your browser.
Calculating the Spiral Structure
Making Person Anonymous
After
the image are confined in storage, now one more and most important step are to
be followed, all the identities are made anonymous. Special software used for
doing this entire task. This software process the raw data and it automatically
differentiate between the real person and statue. A
statue doesn't need to be made anonymous but all the license plates
of vehicles and person’s face are blurred so that no privacy should be exposed.
 |
| Image Before Processing |
 |
| After Processing |
Browsing the 3D data
And after all these, data of
all the cities are saved on different mirrored servers around the world for
security reasons. While browsing the Bing Map, you’ll notice the small blue
man, click on it will enter you inside the 3D street view, first you’ll see the
low resolution image, after zooming to a point, the higher resolution image are
loaded inside your browser cache and give you greater details of the view. All
the processing and switching between the one to another street views are done
on client side i.e. Browser and this all take less than 20 ms, you can’t even
notice.
Also
one more point, all the cities data are not saved on single server, these
data’s are saved on different servers and all those data are browsed from
different part of globe within instance. This decentralized concept prevents
data loss for any area due to server down of single location.
Hope
you loved this post and will got to know many things hidden to your mind. Leave
your comment below.
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