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1 Practice: EGL - Advanced GIS Crash Event Geolocator
Subject Area: Operations
State: Nevada
Organization: Nevada DOT - Safety Engineering
Contact: Lawrie  Black
Title: Senior GIS Analyst
Email: lblack@dot.state.nv.us
Phone: 775-888-7206
Description: EGL draws from the Nevada Statewide Crash Database (NCATS) and disaggregates law enforcement descriptions of accident locations. Location descriptions are first classified, then parsed (e.g., street n ...[click for more]
  Image: “EGL”  Geolocator  
   
2 Practice: GeoTrans - Multi-Level Linear Referencing System Data Model
Subject Areas: Asset Management
Maintenance
Operations
State: Nevada
Organization: Nevada DOT - Safety Engineering
Contact: Lawrie  Black
Title: Senior GIS Analyst
Email: lblack@dot.state.nv.us
Phone: 775-888-7206
Description: Crash data has been geo-located by NDOT Safety Division's GIS programs for several years using Linear Referencing and Dynamic Segmentation methods. Since 2003, the Division's Safety Management System has incorporated crash and accident data compiled by most of Nevada's police departments. In the last few years, GIS analysts have started to incorporate geo-located data from the Nevada Accident & Citation Tracking System (NCATS).

Linear Referencing involves tracking and analyzing data that are associated with locations along a linear network. Some road transportation examples include: tracking the location of and condition of signage, the condition of pavement, and the location and severity of crash occurrences. The linear referencing system (LRS) is the series of tables and tools used to perform linear referencing.
The Nevada DOT Safety Management System uses an LRS in conjunction with a GIS. The main impetus to merge linear referencing with geospatial technology can be stated simply: it is often desirable to view location data on a map. Merging linear referencing with geospatial technology also opens up additional analysis capabilities, such as summing data within an area feature (for example, the kilometers of rail track that require maintenance within a given jurisdiction) or finding data in proximity to linearly referenced data (for example, finding residences within a buffer zone of a construction project).

NDOT uses Intergraph's GeoMedia GIS to do bulk mapping of linearly referenced tabular crash data - called Dynamic Segmentation (or linear geocoding). This methodology interpolates the location of linearly referenced data along the LRS Linear Features by making use of the road (or rail, ferry line, and so on) name and measurement attributes stored on those features. This concept of locations based on an interpolation between measure values on the LRS linear features helps better understand the underpinnings of a geospatially based LRS.

NDOT's LRS is based in large part on research conducted by the Federal Highway Administration's National Cooperative Highway Research Program (NCHRP) 20-27 model, but Geotrans is refined by NCHRP 20-27-2, which is more focused on LRS.

The GeoTrans Transportation Data Model absorbs street centerline files and converts geometric and tabular data into datum information. This datum information preserves both linear references of crash locations and geometry over time - thus allowing for temporal event location stability. Events (crashes) are located in the same relative location - even if the underlying road geometry has changed. The Safety Division publishes several model production datasets such as the amalgamated statewide public road network, intersection markers, and the "State Cumulative" measure. The multi-level LRS is a key component of NDOT's Safety Management System (SMS).
  Image: NDOT Geotrans MLLRS  
   
3 Practice: Location Information System (LOIS)
Subject Area: Asset Management
State: Nevada
Organization: Nevada Department of Transportation
Contact: Gary Nelson
Title: Geodesist
Email: gnelson@dot.state.nv.us
Phone: (775)888-7486
Description: The Location Information System (LOIS) is a GIS-based application that provides information on survey monument locations.
Related Documentation: https://gis.dot.nv.gov/lois/
   
4 Practice: Planning and Needs System (PLANS)
Subject Areas: Environment
Planning
GDC
PEL
State: Nevada
Organization: Nevada Department of Transportation
Contact: Holly Smith
Title: Project Manager
Email: HSmith2@dot.state.nv.us
Description: NDOT's PLANS will be a centralized portal for collecting, maintaining, and tracking geospatial information and other data related to transportation projects at all stages of development. PLANS will al ...[click for more]
   
5 Practice: Traffic Information Access (TRINA)
Subject Areas: Asset Management
Operations
State: Nevada
Organization: Nevada Department of Transportation
Contact: Al Le Balch
Title: Application Developer
Email: alebalch@dot.state.nv.us
Phone: (775) 888-7763
Description: TRaffic INformation Access (TRINA) is a web-based GIS enabled application that provides maps and reports of traffic count and classification data. Users can select single or multiple traffic count sta ...[click for more]
Related Documentation: https://ndot.maps.arcgis.com/home/index.html
   
6 Practice: WEB-CARE GIS Web Portal for Safety Data
Subject Area: Operations
State: Nevada
Organization: Nevada DOT - Safety Engineering
Contact: Lawrie  Black
Title: Senior GIS Analyst
Email: lblack@dot.state.nv.us
Phone: 775-888-7206
Description: Nevada DOT (NDOT) has developed a new web portal for crash data. The portal allows all NDOT staff and outside safety agencies to analyze data via user-friendly maps, tables, and charts. This is the fi ...[click for more]
  Image: NDOT web care  
   
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