D5 Annex report WP 3: ETIS Database methodology ... - ETIS plus
D5 Annex report WP 3: ETIS Database methodology ... - ETIS plus
D5 Annex report WP 3: ETIS Database methodology ... - ETIS plus
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<strong>D5</strong> <strong>Annex</strong> <strong>WP</strong> 3: DATABASE METHODOLOGY AND DATABASE USER<br />
MANUAL – FREIGHT TRANSPORT DEMAND<br />
In case different methods are applied based on the different available data sources that can vary<br />
significantly among the different countries also some diffusion of interpretations can occur. On<br />
some elements of the database and for some geographical areas more estimation will be<br />
necessary than for others. It is important that these differences can easily be traced back from<br />
the results shown from the database to be able to make the right interpretation.<br />
These situations where assumptions have to be made to be able to generate the database and<br />
information from this database, and where data can not be shown without the necessary<br />
information on these assumptions, we could capture under the ‘understandability’ restriction.<br />
This restrictions requires that the database and the surrounding system is structured in such a<br />
way that information needed for the interpretation of the information extracted can be easily be<br />
made available.<br />
In the first place the transport chain freight database should be a simplification of reality in<br />
order to be able to understand how and where transport takes place. This means that many<br />
variables that could be observed have to be left out. Since each analysis of a problem requires<br />
another level of detail of the database. The policy requirement restriction which are in this case<br />
the TEN policies, determine which data should be included and which not. This is described in<br />
section 4.3.<br />
In the next paragraphs realistic possibilities for the format of the transport chain database will be<br />
described.<br />
The ideal Transport Chain<br />
To get a better view of which variables should be included in the transport chain database, an<br />
example is presented in figure D.1.<br />
Document2<br />
27 May 2004<br />
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