You may have noticed that on some of the air segments in your instance there is both a Distance value and a Distance Adjusted value. This difference is due to the methodology that has been used for the air segment. If the ICAO+ methodology is used then a Distance Adjusted value will be stated, as shown below.
The distance is calculated by finding the shortest Great Circle Distance (GCD), which is the shortest distance between two points on the surface of a sphere. Whereas the Distance Adjusted uses this GCD but also takes into account the effects of closed airspace, stacking, and routing changes due to weather.
For air segments employing the DEFRA and DEFRA+ methodologies, only a distance value is stated. This is because the DEFRA emission factors utilised in the calculation already integrate an uplift factor that accommodates indirect flight paths and delays.
For more details into the air methodologies used within the calculator please visit our methodology documents: Full Methodology Document
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