As discussed in Sitework Overview, when the site model is generated, two different display modes of the site model object are available—existing and proposed. The proposed DTM is a calculation of the existing data altered by site modifiers. Site modifiers are specific objects with capabilities to modify the site model. Site modifiers can be placed on any layer; however, the site model properties specify whether modifiers in another layer can affect the site model (see Creating the Site Model).
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