Learn about types of evaluators used by a network Any other value indicates a street that permits travel in either direction.N indicates a street that does not permit travel in either direction.TF or T indicates a one-way street permitting travel only against the digitized direction of the edge.FT or F indicates a one-way street permitting travel only in the digitized direction of the edge.The New Network Dataset wizard recognizes a string field named One_Way or Oneway, creating evaluators that interpret its values as follows: If you are modeling one-way streets, be sure that your edge sources have a field specifying one-way street information.For edge sources, if the impedance values differ based on direction of travel, provide a separate field for each direction of travel, for example, FT_Minutes and TF_Minutes. For best results, name these fields as the units of your impedances, since these fields will automatically be detected by the New Network Dataset wizard-for example, you might want to name your travel time field Minutes. Be sure your sources have fields that represent your network impedance values-distance, travel time, and so on.Prepare the sources for appropriate roles inside the network dataset.You may need to create new feature datasets or new feature classes, and you may need to edit features.If you're creating a network from shapefiles, you need to organize into the same folder all the feature classes that will participate as sources.If you are creating a geodatabase-based network dataset, all feature classes participating as sources in a network should be present in one feature dataset.Prepare the feature dataset and sources.There are five main steps in creating a network dataset: You can link to them from the "Related topics" section of this document. There are three exercises in the Network Analyst tutorial that step through creating a network dataset.
0 kommentar(er)
