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New in Emme 4.3

Emme 4.3 introduces new scenario management features, improvements to multimodal network editing, a new Space-time Traffic Assignment for time-dependent network loading, multithreaded optimizations for transit analysis, a new Data Table API for automating work with spatial and relational data, support for text attributes on network elements, new and enhanced Emme Modeller tools, mapmatching capabilities, improved Emme Notebook workflows, GIS layer support in Network Find, a new look-and-feel and more.


New Scenario Management

New scenario management features allow saving network edit sessions as 'build' files which can be used to apply to child scenarios in master/slave arrangements, as transactional project alternatives or for collaboration with colleagues. It is then possible to 'stage' network builds with graphical previews of edit operations before they are applied, to 'build' the edits into a different scenario, and then to graphically summarize the applied edits.


Space-Time Traffic Assignment

A new traffic assignment for time-dependent network loading with the convenience of existing network topology and delay functions. Demand matrices may be time-profiled and the network loading varies over time as flow progresses through the network. This method is especially recommended for statewide, national or long-distance models in which longer trips should not simultaneously load all time periods at once.


Optimizations for Transit Analysis

All Extended transit analysis tools are now multithreaded. Transit strategies are also up to 50% smaller on disk. Expect the following performance improvements with between 8 and 16 threads, depending on application size. Also note that some procedures will continue to scale with more threads.

Transit Analysis TypePerformance Gain
Matrix Results 3-6x faster
Strategy Analysis 3-7x faster
Path Analysis 6-12x faster
Station to Station Analysis 4-5x faster

Multimodal Network Editing Improvements

Transit lines are automatically 'shelved' and may be re-routed around network changes. Context-sensitive defaults for boardings/alightings and new merge node and attach/detach link operations help save time coding. Edit operations, undo/redo and map drawing are all faster, and map rendering is improved.


Other Highlights

  • SOLA and PToll traffic assignments now support up to 1000 analyses per class without requiring multiple traffic assignment runs
  • Transit demand adjustment now supports multiple sources of counts and boardings which can be used simultaneously and weighted
  • SOLA Traffic Assignment is now supported by the Continue Traffic Assignment tool permitting opposing-flow and intersection-delay methods to be implemented natively in Emme Modeller
  • A new Data Table API allows Python data access and automation of Emme native relational and spatial features
  • GIS Vector Layers now participate in Network Find for both expression-based and spatial searches
  • An improved map matching algorithm is available to associate third-party network data with Emme network models - useful for importing and placing directional attributes like speeds or counts on your model network
  • Network fields offer a new way to store text and other data with network elements
  • New Modeller tools for network management including improved Import from GTFS, Export to GTFS, Import from TomTom MultiNet format and more
  • Desktop and Modeller tabs now reflect state-of-use in Notebook for easier mixed interactive/scripted workflows
Improved Emme Notebook workflows for drag-and-drop automation
GIS Vector layers in Network Find
Import or mapmatch networks and speeds from shapefile, TomTom and other formats