Basemap Benefits

DDTI Basemapping

Making centerlines work for you.

Here are examples of how accurate centerlines can have a positive and far-reaching effect on different government agencies within your community.

9-1-1 and Dispatch County Sheriff
County Auditors and Assessors County GIS and Engineers
Board of Elections

9-1-1 and Dispatch

High-end centerline datasets maximize the efficiency of cleaning and updating the E9-1-1 database, which in turn improves the overall effectiveness of your 9-1-1 communication system.

The geographic location and field verification of every structural address in a county provides the E9-1-1 agency the ability to map the address of any wireline distress call. Since all addresses are field verified, nearly all distress calls with ALI address information or verbal address confirmation will match with the address database. In addition, if a distress call comes in where an address does not match the database, then the field-verified point locations of every address provide the extremely focused information to geocode, or interpolate, where the address should be based on surrounding addresses

The field-verified address inventory also provides an effective audit of all the structures in a county jurisdiction that do not have a posted or clearly visible address. These structures can then be compared with other county databases to generate a notification list for all such structures to have clearly visible addresses posted for future emergency service.


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County Sheriff

Aside from E9-1-1 applications, this data can be used for criminal investigation.

Since every criminal and nearly every crime has an address of where it occurred and details about that crime; the geographical location of those crimes/criminals can be mapped and related to each other.

Additional benefits include:

  • Locations of incidents can be mapped and viewed as a whole for relationships and patterns.
  • Traffic accident pattern analysis can be accomplished by locating the incidents on a map for evaluation.
  • Create buffers to visualize and enforce restraining order distance criteria.
  • Narrow perpetrator search areas by mapping incidents and focusing investigation to certain areas based on proximity, criminal history, etc.
  • Map all individuals with criminal records and classify criminal history by color or symbol.
  • Do advanced searches and queries for suspects based on street name, criminal history, distance proximity, etc.
  • sex offender residence proximity analysis.

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Auditors & Assessors

Highly detailed centerline data aids the county auditors and assessors in the cleaning and updating of the county’s Computer Aided Mass Appraisal (CAMA) database. Recent analyses of DDTI client CAMA databases revealed average error rate of 30%.

Linking their CAMA database to this newly refined data introduces property search functionality using a host of new criteria (owner, address, parcel number, intersection, etc.)

With the geographical location of every address linked to the CAMA database, assessors can execute property value spatial modeling to visually assess trends and patterns in the property values throughout the county. The data also provides the road and address mapping for on-site assessment visits and can facilitate GPS integration for Automated Vehicle Routing with assessment fieldwork.

Since the basemap acts as the foundation upon which all other digital mapping is based, assessors can use this to build all GIS Tax and Parcel Mapping.


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County GIS and Engineers

A highly accurate centerline basemap allows the county engineer to easily relate multiple layers of data to individual road segments. From multiple DDTI clients’ experience, the accuracy of crash data analysis increases dramatically, enabling county governments to report more accidents and subsequently collect more roadway safety funding.

Analyzing the LBRS data, ODOT had established about 190 crashes when identifying this section as a safety study area. After comparing this information with the LBRS files, Clark County’s final tally exceeded 550 crashes.

The countless deliverables, including traffic controls and other signage, enables the engineer to jumpstart asset inventory.

Additional benefits include:

  • Since the centerlines are three dimensional, the county engineer receives a pseudo-Digital Elevation Model (DEM) for the county road network.
  • Field verified road signs update the road name databases inclusive of road classifications and road name aliases.
  • The 3D centerlines provide the county engineer with the ability to check and verify digital orthophoto positional accuracy.
  • The data provides the county engineer with the ability to access resident names, property owners, and print maps for mailing notifications to county citizens affected by construction projects quickly and accurately.
  • The centerlines with address data allows for proper addressing of new developments based upon distance, parity, and other geographical variables.
  • The centerline facilitates snow removal optimization based on enhanced routing capability. This means better routing of plows and salt trucks based on road priority and the ability to monitor and organize which roads have or have not been plowed.
  • The 3D distance/elevation data can be used for preliminary engineering design.
  • The basemap data can enable the county engineer to verify proper tax map alignment.
  • Perform everyday property and adjacent property owner identification.

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Board of Elections

Mapping every field-verified address to either side of the street enables a County Board of Elections to know with 100% certainty what district voters reside in.

The address data linked with property owner information empowers the Board of Elections to send notifications to any residence that is voting in the wrong district.

Road maps and voting locations can be mapped and printed for distribution to county voters. Distribution of the information can be done traditionally through the U.S. Postal Service or online through a DDTI hosted service AccuGlobe Internet: Online Elections. Our Online Elections web software allows voters to interactively search for their ballot box location and then provides custom mapping and driving directions to it.


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Basemapping Testimonial

Out of all these years of GIS development, and of all the companies we have worked with, DDTI is the only one who has delivered on what they promise.

- Shawnda Wenino
GIS Manager
Marshall County, IN