How to calculate emissions for a routing with a factor-based approach

Factor-based calculation approaches contain factors for emission calculation. Users have to enter their own consumption data. Default values for consumptions are provided in this use case description. PTV xRoute offers the following factor-based approaches:

• CEN 2011/2012 - Emission calculation according to the European CEN standard (EN16258) prepares you to meet the legal requirements of the European Union. You can verify your emission totals or their development or specifically compensate for them.

• UK DEFRA 2014 - Emission calculation according to the DEFRA 2014. These emission factors are suitable for the use on UK operations.

• CO2 Decree France 2011 (deprecated) - Since the second half of 2013, all commercial transports (trucks, taxis, ships, trains, etc.) starting or ending in France have to report their CO₂ emissions. In other words: a company carrying out a transport from or to France has to report their emissions. These emissions can be calculated with PTV xRoute Server in accordance with the Decree 2011-1336.

• CO2e Decree France 2017 - Since the second half of 2013, all commercial transports (trucks, taxis, ships, trains, etc.) starting or ending in France have to report their CO₂e emissions. In other words: a company carrying out a transport from or to France has to report their emissions. These emissions can be calculated with PTV xRoute Server in accordance with the Decree 2017-639.

• Australia NGA 2011/2015 - Emission calculation for transports in Australia have to be in accordance with the National Greenhouse Accounts (NGA) factors published by the Australian government.

In this use case description you see how calculations with these standards can be performed. A general overview of emission calculation with PTV xServer can be found here:How to calculate emissions for a routing. Emission calculation with comprehensive approaches is described here: How to calculate emissions with comprehensive approaches.

Concept French CO2 Decree

Vehicle parameters for the French CO₂ decree

Emission calculation according to the French CO₂ decree uses various calculation factors for the average fuel consumption of a vehicle. Therefore the vehicle classes used for the French CO₂ decree do not fit the HBEFA vehicle classes.

The correct vehicle class has to be determined by setting the AVERAGE_FUEL_CONSUMPTION in the list of VehicleParameters. The following table gives an overview of the vehicle classes used by the French CO₂ decree and their average fuel consumption:

Concept UK DEFRA

Vehicle parameters for UK DEFRA

Emission calculation according to the UK DEFRA uses various calculation factors for the average fuel consumption of a vehicle. Therefore the vehicle classes used for the UK DEFRA do not fit the HBEFA vehicle classes.

The correct vehicle class has to be determined by setting the AVERAGE_FUEL_CONSUMPTION in the list of VehicleParameters. The following table gives an overview of the vehicle classes and their average fuel consumption. The consumptions were determined by the Department of Transports in the UK. As AVERAGE_FUEL_CONSUMPTION value please take the "rate of fuel consumption liter per 100km". Miles per gallon are just given as orientation.

Programming Guide

Factor based emission calculation

Request

Use a request with at least two stations:

{
  "waypoints": [
    {
      "coords": [
        {
          "point": {
            "x": 685903,
            "y": 6372958
          }
        }
      ],
      "linkType": "NEXT_SEGMENT"
    },
    {
      "coords": [
        {
          "point": {
            "x": 681013,
            "y": 6371680
          }
        }
      ],
      "linkType": "NEXT_SEGMENT"
    }
  ],
  ...

Set the cenEmissionConfiguration attribute in the ResultListOptions element according to your use case. In this example CEN 2012 is requested. These settings determine the type and extent of emission values that are returned in the response. The attribute CENVersion of the CENEmissionConfiguration element selects the standard that is basis for the calculation. The French CO₂ decree and the Australian NGA norm are modeled as CENVersion because they are considered to be CEN-like.

The other attributes in CENEmissionConfiguration select the kind of interpretation of the emission values returned in the response, as well as the response element that contains them. For example, setting fleetSpecificAverageFuelConsumption will result in emission values based on the specified average fuel consumption for the whole fleet, which is returned in the sub-element fleetSpecific of the cenEmissions element in the response.

"details": {
  "cenEmissionConfiguration": {
    "$type": "CENEmissionConfiguration",
    "fleetSpecificAverageFuelConsumption": "8.7",
    "cenVersion": "CEN_2012"
  }
}

Set the granularity of the emission information returned in the response with the cenEmissions element in the ResultListOptions. Possible levels are:

"details": {
  ...,
  "emissions": {
    "$type": "EmissionType",
    "emissionLevel": "BASIC"
  }
}

Response

Depending on the configuration of the EmissionType in the request, the total emissions can be found in the cenEmissions element at the route, stations, or segments. The units of each emission value vary according to the specification.

"route": {
  "info": {
    "distance": 4157,
    "time": 527,
    "cost": 6053
  },
  "cenEmissions": {
    "vehicleSpecific": {
      "$type": "CENEmissions2012",
      "energyUseTank2Wheel": 10.610544,
      "energyUseWell2Wheel": 12.422904,
      "energyUseWell2Tank": 1.81236,
      "co2eTank2Wheel": 0.7974383999999999,
      "co2eWell2Wheel": 0.9490175999999997,
      "co2eWell2Tank": 0.1515791999999998,
      "fuelConsumption": 0.24549240000000003
    },
    "fleetSpecific": {
      "$type": "CENEmissions2012",
      "energyUseTank2Wheel": 11.5389666,
      "energyUseWell2Wheel": 13.509908099999999,
      "energyUseWell2Tank": 1.9709414999999986,
      "co2eTank2Wheel": 0.86721426,
      "co2eWell2Wheel": 1.0320566399999997,
      "co2eWell2Tank": 0.16484237999999982,
      "fuelConsumption": 0.266972985
    }
  },
  ...

The type of emission values is determined by the CENVersion that was set in the request, setting CEN 2012, for example, returns the emission element CENEmissions2012 which extends CENEmissions . The listed values depend on the emission standard. Have a look at the documentation for CENEmissions2011, CENEmission2012, CO2DecreeFrance2011, CO2eDecreeFrance2017, AustraliaNGA2011, AustraliaNGA2015 or UKDEFRA2014 for detailed information.

vehicleSpecific emission values are calculated based on the settings in the XML profile element Profile/Routing/Vehicle .

fleetSpecific emission values are calculated based on the value of the CENEmissionConfiguration attribute fleetSpecificAverageFuelConsumption , but partially use the settings from the vehicle profile, for example the fuelType or the emissionClass .

Complete JSON request:

{
  "waypoints": [
    {
      "linkType": "NEXT_SEGMENT",
      "coords": [
        {
          "point": {
            "x": 676437,
            "y": 6448604
          }
        }
      ]
    },
    {
      "linkType": "NEXT_SEGMENT",
      "coords": [
        {
          "point": {
            "x": 685099,
            "y": 6416093
          }
        }
      ]
    }
  ],
  "details": {
    "cenEmissionConfiguration": {
      "$type": "CENEmissionConfiguration",
      "fleetSpecificAverageFuelConsumption": "8.7",
      "cenVersion": "CEN_2012"
    },
    "emissions": {
    "$type": "EmissionType",
    "emissionLevel": "BASIC"
    }
  }
}

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