November, 2018

The maps below demonstrate the use of ArcGIS for Desktop 10.6's Network Analyst tools.
GNSS field collection and knowledge of municipal standards were used to obtain accurate values for speed limits and traffic flow directions in the area. Attribute domains were used to ensure data integrity during this process. Length and travel time figures were generated using the ArcGIS Field Calculator.
A Network Dataset was created with minutes and length specified as impedance values. From here, constraints were added to accurately model turns using a Turn Feature Class created for this purpose and ArcGIS' editing tools.
Labels were derived from existing attribute data or the Nova Scotia GeoNames database. These were then converted to annotation feature classes to further refine label placement. A hierarchical approach consistent with cartographic standards was used for all text, producing a readable and intuitive design.

Route Analysis


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This map demonstrates the use of ArcGIS for Desktop 10.6's Network Analyst tools for Route Analysis. In this study, efficient car travel routes were identified between specified stops, using a portion of Annapolis County, Nova Scotia, as a study area.

Stops in the analysis were defined by addressed locations, and the network dataset used to perform the analysis was derived from the area's road network. The source for the network model was Nova Scotia Civic Address (NSCAF) road data in vector shapefile format.

To perform the analysis, a new Route was created within ArcGIS using the Network Analyst tools. Stops were added interactively using a custom Address Locator created for this purpose. The best route was then automatically generated by the software.




Service Area Analysis


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To perform Service Area Analysis using the same prepared base data and network dataset as above, a new Service Area analysis layer was created within ArcGIS using the Network Analyst tools. The location of a fire station was added using a custom Address Locator created for use with this network. Analysis parameters such as impedance and break intervals were specified as properties of this layer. The service area was then automatically generated by the software.




Origin-Destination Cost Matrix Analysis


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To perform this analysis, a new OD Cost Matrix analysis layer was created within ArcGIS using the Network Analyst tools. Analysis parameters such as U-turn permissions, cutoff distance value, and output geometry type were then defined within the layer's properties.

Origin and Destination points were added interactively to the map using a custom Address Locator created for use with this network. A series of least-cost routes from each origin to the nearest destinations were computed by the software and depicted on the map as straight lines. A table of values were also generated. The distances shown in the table represent the true distances that would be traversed within the network rather than straight lines.




Closest Facility Analysis


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To perform this analysis, a new Closest Facility Area analysis layer was created within ArcGIS using the Network Analyst tools. Locations of incidents and facilities were interactively added to the map using a custom Address Locator created for use with this network.

Analysis parameters such as impedance, cutoff cost, and U-turn restrictions were specified as properties of this layer. Routes from incidents to facilities were then automatically generated by the software.




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