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Venice – Final analysis

You probably remember the recording in Venice: Blimp recording in Venice, Recording in Venice in detail. We have obtained permission to share some of the results, so we can show you what can DataFromSky do for you, too!

Speed profile

The speed profiles for both areas were extracted.

At a glance, one can see what speeds belong to which path through the crossroads. It is also plainly visible which trajectories belong to slow and which to speedy drivers. In this case, the total area captured and analyzed is too small to show bigger changes in speeds, though.

Speed profile, Caposile roundabout
Speed profile, Portegrandi T-intersection

Area coverage

Density of trajectories corresponds to area usage. One can thus estimate how much of the road’s width is actually used by passing vehicles, and where the wear of roadway is most intensive.

Area coverage, Caposile roundabout
Area coverage, Portegrandi T-intersection

Conflict areas

DataFromSky can detect situations where vehicles become too close, or have to slow down to let each other pass. This is a visualization of these events’ spatial distribution. You can easily see that there is a single point for the T-intersection and estimate from the pattern at roundabout that its southern leg is far less used.

Conflict areas, Caposile roundabout
Conflict areas, Portegrandi T-intersection


Deflection and radius analysis

Deflection angle and radius analysis, Caposile roundabout

Deflection angle denotes the part of road which requires circular movement. Radius describes the size of that circle. Both can relate either to the shape of road, or actual trajectory used by vehicles.

DataFromSky provides real vehicle trajectories, so actual deflection angles and radii can be measured. These depend on the combination of entry and exit points, so it’s natural to split the trajectories into groups. Again, with DataFromSky you are not left wishing for features.

Road design validation

Road design validation, Portegrandi T-intersection

Last but not least, the trajectory data from DataFromSky is exactly what you need to validate design of the road. Whatever the design process, verifications, and modelling tell you before, here you get real data about the situation.

Pictures used in this post are only illustrative and do not match the text perfectly. All trajectories are visualized, instead of particular groups.

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Recording in Venice in detail

You have already read about the recording in Venice. Now that the work is finished, we can share a closer look at the whole process.


The surveys were done near Jesolo – a famous seaside resort known for its abundant holiday facilities and a 15-kilometre (9 mi) beach called Lido di Jesolo. At the height of its touristic life, Jesolo hosts 6 million tourists per year. Traffic data in the area are fundamental.

ESSEOTTO Engineering was interested in a deep analysis in the field of road safety and road traffic on rural roads in Province of Venice. This first test concentrated on various types of intersections: T-intersection and a small roundabout. They didn’t want to only survey traffic (counting and classification) but also many other parameters such as: speeds, acceleration, time, distance and other parameters fundamental for road safety. Only DataFromSky is capable of helping them – there is no other way to collect all of this data comprehensively.

The places

Let’s take a look at the places of recording.

Small roundabout – Caposile

The first intersection is a typical Italian compact roundabout in front of the urban area. Here, interactions with other type of road users than just cars can take place. Since the speeds are lower than at other types of intersections, in this case the objects of study were roundabout angle deviation and trajectories arising from interaction with pedestrians.

T-intersection – Portegrandi

The second is a typical T-intersection between two rural roads: a primary road and a secondary road with a stop signal. The main issues are the speeds on the primary road and the conflict points on turn-left manoeuvres from primary road.

On-site operations

A date was selected and the engineers from TAU could finally come and do their thing – fly their blimp and record a video of the traffic. The recording was from height of 40-70 meters and gathered a total of 4.5 hours or 270 minutes of traffic footage for analysis.

Blimp on the truck Blimp in the air Blimp high in the sky

The weather was very severe, and in fact a storm warning was issued for the day. The blimp rocked wildly in the winds, turning to and fro madly. Despite that, the recording could be stabilized in-software and used. The height to which the blimp was allowed to rise was limited by the weather, too. Fortunately, both of the sites were completely kept in view of the camera all the time, so there wasn’t any problem with processing.


A lot of interesting data was gathered in a short space of time. Thanks to these surveys, ESSEOTTO Engineering is now able to analyse the infrastructure with more efficiency.

Road traffic and OD matrix
Thanks to the field of vision, granted by vantage point above the intersections, we are able to detect every vehicle and know its destination, with 100% accuracy.
Road safety analysis
ESSEOTTO engineers are studying trajectories and driver behaviour to understand incorrect manoeuvres and improve intersections’ road safety.
Road design
A new concept of infrastructure design is growing – allowed by the rich data available with DataFromSky. Thanks to geometric parameters such as angle deviation, lane occupancy, speed profile and much more, a traffic engineer can carry out new designs with better accuracy and data firmly grounded in reality.
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Blimp recording in Venice

A series of recording happened around Venice in recent days. A big difference from our “traditional” quadcopter-based approach was the vehicle used for carrying the camera: a tethered blimp.

This pilot project involved TAU, TrafficLab and S8 Esseotto.

The blimp visited three crossroads around Venice, recording from height of 40-70 meters a total of 4.5 hours or 270 minutes of traffic footage for analysis. The weather was somewhat disfavourable, with strong gusts of wind. The results turned out excellent, though.

Analysis of the videos is underway.


Blimp on the truck Blimp in the air Blimp high in the sky

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