Road Stretch Forecasting
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Transcript of Road Stretch Forecasting
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Using High Resolution Databases for Road Stretch
Forecasting
Torben Strunge Pedersen, Claus Petersen, Alexander Mahura, Kai Sattler
Research and Development Department Danmarks meteorologiske institut (DMI)
Contakt: [email protected]
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Road Stretch Forecasting
370 Road stations
153 Routes
22840 Parts with
500 m or less between
points
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Road Stretch Forecasting
370 Road stations
153 Routes
22840 Parts with
500 m or less between
Points
Atmospheric model
With 5 km resolution
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Road Stretch forecastingLarge scale and local features
• Atmospheric state provided by the Numerical Weather Prediction Model
– Cloud Cover– Radiation– Vertical structure of wind, temperature and humidity– Average grid point temperature
• NWP Models provide information for a fixed grid
• Site specific model– Shadows– Sky view– Local observations– Local cold air pooling– ’Random’ distributed points– Local wind conditions– Local near surface temperature– Local terrain features
• Height• Vegetation type and height• Buildings• Terrain type
– Traffic– Road characteristics
• Material• Road type (bridge, elevated road etc.)
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OBTAINING LOCAL INFORMATIONTHE DANISH HEIGHT MODEL
Horizontal Resolution: 1.6 x 1.6 meter
Vertical accuracy: 3 cm
Coverage: Denmark
Laser scanning from airplane
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OBTAINING LOCAL INFORMATIONTHE DANISH HEIGHT MODEL
Horizontal Resolution: 1.6 x 1.6 meter
Vertical accuracy: 3 cm
Coverage: Denmark
Laser scanning from airplane
• Deduced parameters• Height
• Shadows• Sky view
• Terrain type
– Valley
• Dimensions
• Orientation
– Slope
– Hill top
– …
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OBTAINING LOCAL INFORMATIONTHE DANISH HEIGHT MODEL
Horizontal Resolution: 1.6 x 1.6 meter
Vertical accuracy: 3 cm
Coverage: Denmark
Laser scanning from airplane
• Deduced parameters An alternative approach (fish eye)• Height
• Shadows• Sky view
• Terrain type
– Valley
• Dimensions
• Orientation
– Slope
– Hill top
– …
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OBTAINING LOCAL INFORMATION
Application of the Danish Height Model at a single site
Øster Voldgade (station number 1543)
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Height profile and shadow effects
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Height profile and shadow effects
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Height profile and shadow effects
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Height profile and shadow effects
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Height profile and shadow effects
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Height profile and shadow effects
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Height profile and shadow effects
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Height profile and shadow effects
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Height profile and shadow effects
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Height profile and shadow effects
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Height profile and shadow effects
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Height profile and shadow effects
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Height profile and shadow effects
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Height profile and shadow effects
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Height profile and shadow effects
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Height profile and shadow effects
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Height profile and shadow effects
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Height profile and shadow effects
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Different methods to obtain shadow and skyview angle
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Different methods to obtain shadow and skyview angle
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Different methods to obtain shadow and skyview angle - Transparency properties
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Other Databases
• Application of the High Resolution Databases:
• Kort & MatrikelStyrelsen (KMS) 10x10 meter resolution database of terrain coverage such as building, water objects, forrest, individual trees, road and many other types.
• Global Self-consistent Hierarchical High-resolution Shorelines (GSHHS) database (evaluate distance and direction to seashore – transport of cool/warm, most/dry air);
• COoRdinate INformation on the Environment (CORINE) database on detailed land cover and use characteristics (classify road stations/ stretches and their surroundings at local and remote scales – clarification on shadowing effects, sky view factor).
• DRD database on driving lanes characteristics (albedo, density, heat conductivity, heat capacity – direct input into RCModel).
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Summery
• High resolution databases can provide physiographic data for road stretch forecasting
• Apart from terrain elevation and slope also shadowing and sky view effects can be deduced
• This approach can eliminate manual measurements