![]() Many of these data types do not include demand information, so further data conversion is required to translate the information contained in the future condition polygons into projected demand values. ![]() ![]() If the data relates to projected values, it can be used for demand projections. Note that these data sources can also be used to assign current demands the difference between the two being the data that is contained within the source. A variety of data types can be used with this technique, including future land use, projected population, or demand density (in polygon form), with the polygons based upon traffic analysis zones, census tracts, planning districts, or another classification. This type of demand estimation can be used in the projection of future demands in this case, the demand allocation relies on a polygon layer that contains data regarding expected future conditions. These are similar to the Flow Distribution allocation methods except that the type of base layer that is used to intersect with the service layer may contain information other than flow, such as land use or population. Automated techniques have also been developed to assist in the estimation of demands using land use and population density data.
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