EUROCONTROL MANUAL FOR AIRSPACE PLANNING 2(97)

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For Test Cases, the aircraft profiles should be developed according to the simulation objectives. It is very important to ensure that the traffic distribution (origin/destination, route assignment, hourly/daily distribution, runway in use) is realistic, e.g. it is similar to reality. Whilst for the Base Case it is generally easy to set up a realistic traffic sample, for the Test Case it can be very difficult to forecast the traffic distribution, particularly in the situation when new runway/airports are tested or major changes in the traffic demand are expected. In these conditions, it is recommended to develop more options so as to cover the most probable possibilities.
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After the Test Cases have been prepared, which means that the routes, holds and airspace structures are defined and the traffic sample is assigned, data can be extracted by running a series of queries.
The output from airspace modelling includes a large amount of data which can be clustered into several groups:
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Generic statistical data

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 sector load

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 routes/segments load

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 point load

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ATC related data

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 workload

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 conflicts

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aircraft data related to flight profile e.g.

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 flight time

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Those data can be used directly for initial estimation or can be processed using various tool and produce more refined result in form of statistical data, charts and graphs. Such data can provide valuable statistical information, but to assess the performance of the various Test Cases, all figures should be filtered and qualitatively assessed.
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Attachment D.3.1
Airspace Modelling
Routes, holds and sectors modelling
The first step in airspace modelling is to translate the design developed by the team into a simplified, computer based representation i.e. the Airspace Organisation and Traffic Sample.
In most of the cases, routes are described as a 2D network of linear segments. These segments could have associated proprieties such as orientation (eastbound/westbound/bi-directional), type (arrival/departure/cruise), etc.

These modelling tools usually do not use curved segments and aircraft models have no turn capabilities. However, in order to describe more accurately the SIDs and STARs, the curved segments of the procedures can be approximated by linear segments.
Similar methods can be used to describe (approximate) the holds. However, the airspace modelling has a very limited application in holds evaluation, due to the limitation of the aircraft model and because the tactical interventions of the ATC normally cannot be described by the tool.
　
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