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March
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2012I
su
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March 8, 2012I suggest that the dtfinieion Gravity measures Defines catchment areas by measuring travel impediment on a continuous scale. ( C. Curtis, J. Scheurer 2010) is deleted since although the statement is true there are many other accessibility measures that also fit this description and gravity measures do not always relate to catchments. Also the term gravity implies attraction which is correct but could lead to confusion with travel demand planning which relies heavily on gravity concepts. The list of types of measures remains a bit partial and it is beyond the scope of a glossary to do a comprehensive list of all accessibility measures. If however some of the most common measures need to be in the glossary then I suggest the three main categories are: 1. based on the utility of travel (e.g. time measures, utility based measures and other transport based value systems), 2. based on the opportunities available from an origin (e.g. Keeble job opportunities, economic potential measures, Shimbel nearest opportunities, Hansen origin measures, timespace geographic measures activity spaces, opportunity surfaces, etc), 3. based on the catchments of destinations (e.g. catchment populations, Hansen destination measures, etc). Othewise the list looks good but as the drafting of the reports takes place and new terms are added they need to be added to the list and modified through debate.
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(VISITOR) AUTHOR'S NAME
Ozan
MESSAGE TIMESTAMP
16 december 2014, 19:42:49
AUTHOR'S IP LOGGED
62.210.78.179
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