> 911 Regional Planning

911 Regional GIS

Regional Geographic Information System (GIS)

The BVCOG’s regional GIS program assists the county database maintenance projects in Burleson, Grimes, Leon, Madison, Robertson  and Washington counties with mapping and data processing associated with rural addressing for 9-1-1.  The county database maintenance projects are responsible for addressing new structures and driving new roads in the rural part of the counties.  Each county has a county database maintenance coordinator that is responsible for maintaining the Master Street Address Guide (MSAG), updating the county maps, coordinating changes with the cities and clearing the error and fictitious address databases.

For maintenance of the county databases, the county database maintenance coordinators collect new road and driveway data using satellite Global Positioning System (GPS) equipment.  They transfer the raw road arc and driveway point data files electronically to the GIS 9-1-1 office for processing and database management.  Updated files are then electronically transferred back to the counties to be used by the coordinators and local emergency service providers.  The county databases include the most current network of named roads, address ranges, driveway points, and various boundaries related to emergency service providers, postal communities and telephone exchanges.

The BVCOG GIS/9-1-1 program assisted Leon, Grimes, Madison and Washington counties to implement fully enhanced 9-1-1 Mapped Automatic Location Identification (ALI) systems at the county PSAP facilities.  Mapped ALI is the geographic display of the landline (not wireless) 9-1-1 caller’s physical location (9-1-1 address) on a digital map at the PSAP.  Each Mapped ALI database consists of the following map layers: street centerline, major roads, hydrology, railroads, driveway points, common place locations, cell towers, hazardous sites, fire protection, bridges, and polygon layers for county boundaries, cities, emergency service number (ESN), telephone exchanges, postal districts and commissioner precincts.  Other specialized data layers are included as requested by the county Addressing Coordinator.  Burleson County Mapped ALI databases are currently being built and should go on-line in first quarter 2007.  Robertson County is scheduled for Mapped ALI implementation in the last quarter of 2007.

The GIS 9-1-1 program has expanded its community outreach by initiating and leading a regional Brazos Valley GIS user group meetings.  The regional users group includes persons from county Appraisal Districts, 9-1-1 programs, Texas A&M University, the cities of Brenham, Bryan and College Station and Brazos County.  GIS 9-1-1 meets biannually with this group to share information, ideas and data vital for regional maintenance and growth preparedness.  GIS 9-1-1 is continually involved in the technical support and training of the county Addressing Coordinators and other Brazos Valley GIS users.


  • The regional 9-1-1 system consists of six Public Safety Answering Points (PSAPs) in six rural counties: Burleson, Grimes, Leon, Madison, Robertson and Washington.
  • The regional PSAPs answered over 91,300 9-1-1 calls for help from September 2005 through August 2006.
  • Over sixty-two percent of the 9-1-1 calls came from wireless phones (56,600).
  • In 2005 & 2006, 9-1-1 funds expended at the county level exceeded $1,284,604 for 9-1-1 equipment, network, database, equipment replacements, wireless services and database maintenance projects.
  • County database maintenance projects received $260,900 in financial assistance in 2005 & 2006.
  • Maintain addresses and routing of over 200 wireless towers.
  • Maintain up-to-date digital maps for five counties including layers of all roads (state, county and private), structure driveways and various hazardous points and service provider boundaries.
  • FY 2007 9-1-1 budget is approved for  $1,031,139