Posts Tagged: roundabout

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Frame rejection in yet Another Denmark roundabout video

It’s time for yet another roundabout from Denmark! This time recorded in the city of Randers, using a tethered drone at altitude of 70 meters and processed as a 5-minute demo for COWI. Given that the drone’s range was 80 meters and it appears to be placed some 90 meters away, the result is certainly nice.

Frame rejection capability

Somewhat less nice is that the video has a few erroneous frames (images). So, we added function to fix that – marking frames as rejected for analysis. It does not mesh perfectly with all of the DFS parts yet: You may notice the background blinks (video problem) and that trajectories are smooth (data is cured), but somewhat confusing is that the labels themselves will jump (visualization breaks). Well, that’s a problem of display only, and will get better soon. The data is correct, that mattered as the first goal.

(Note also that since the web video player drops some frames on its own, you have about a 50/50 chance to even notice any single bad frames from the video below – you can try hunting for the one that occurs at about 0:50).

Statistics

Objects tracked: 220
Total distance travelled: 24314 m
Average speed: 10.31 km/h

Video

Map

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Traffic monitoring in Denmark – the land of bikes

Recently we got to analyzing a video of a roundabout in Roskilde, Denmark. And because Denmark is called: The land of bikes, we didn’t focus only on vehicles but also on bikes! And here is the result of our traffic monitoring:

Length of analyzed video: 15:38.48
Number of objects being tracked: 298 (vehicles and bicycles)
Total distance traveled: 79 354.4 m
Average speed: 34.0233 km per hour
Average distance on roundabout: 59.7474 m

And we would also like to thank Dansk Drone Kompagni for providing us the video.

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Videos from Bayonne, France

Working together with UAV640, we took a look at a roundabout in the center of Bayonne and ran our analytic tools on it.

As you can see, DataFromSky can use higher resolution just fine…

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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.

Motivation

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.

Results

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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