The second type is categorical. Variables, such as Roads or Hydrology
are uniquely identified based on their types rather than
numbers. For instance, constructing an HSR over an interstate
highway requires higher costs than doing the same over a local
street. Hence, adopting the former receives lower suitability than
doing the latter. The last data type is interval format requiring a
second-hand analysis. For example, the Noise variable is measured
in distance, as noise is well represented by distance to best avoid
possible nuisance, rather than its decibel value. According to the
past studies (Harris Miller & Hanson Inc. 2005; Parsons
Brinckerhoff, 2010), noise of an HSR travels up to 360 m at
360 km/h of train speed.
The second type is categorical. Variables, such as Roads or Hydrologyare uniquely identified based on their types rather thannumbers. For instance, constructing an HSR over an interstatehighway requires higher costs than doing the same over a localstreet. Hence, adopting the former receives lower suitability thandoing the latter. The last data type is interval format requiring asecond-hand analysis. For example, the Noise variable is measuredin distance, as noise is well represented by distance to best avoidpossible nuisance, rather than its decibel value. According to thepast studies (Harris Miller & Hanson Inc. 2005; ParsonsBrinckerhoff, 2010), noise of an HSR travels up to 360 m at360 km/h of train speed.
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