7 Data Quality Checks for NG9-1-1
As well as standard geometry checks (e.g., gaps, loop-backs, overlaps, overshoots,),
mapping editors should perform the following checks to ensure road centreline
data is correct for use in NG9-1-1 systems:
• Roads must be segmented at intersections, including at ramps and road
structure end points.
• Road segments must be segmented where they cross at an emergency
service's polygon boundary or at an administrative area boundary, such
as a municipal boundary.
• Address ranges in connected road segments cannot overlap.
• Address ranges cannot have negative numbers.
• Address ranges cannot have an invalid sequence.
• Speed limits range between 5–120 kph.
8 References
Community Map of Canada (2019). Community Map/GFX Features & Attributes v1.2.
Esri, Canada.
Community Map of Canada, e. Esri Canada. https://www.esri.ca/en-ca/products/
data/the-community-map-of-canada
ISO 14825 (2011). Intelligent transport systems—Geographic Data Files (GDF).
International Standards Organization. https://www.iso.org/standard/54610.html
NENA-STA-006.2a-2022. Standard for NG9-1-1 GIS Data Model. National Emergency
Number Association (NENA) Data Structures Committee, NG9-1-1 GIS Data
Model Working Group. National Emergency Number Association, Inc. https://
cdn.ymaws.com/www.nena.org/resource/resmgr/standards/nena-sta-006.2a_
ng9-1-1_gis_.pdf
Natural Resources Canada (2010). National Road Network Guide to Best Practics for
Acquisition, Edition 1.0. Natural Resources Canada Geomatics Canada Centre
for Topographic Information. Natural Resources, Canada
National Road Network (2023). Guide to Best Practices for Data Acquisition. Depart-
ment of Natural Resources. Statistics Canada. https://open.canada.ca/data/en/
dataset/3d282116-e556-400c-9306-ca1a3cada77f
TAC (2017). Geometric Design Guide for Canadian Roads. Transportation Asso-
ciation of Canada. https://www.tac-atc.ca/en/publications-and-resources/geo-
metric-design-guide-canadian-roads
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