  |
 |
Over the last 13 years, the LOJIC system has grown through an initial network configuration based on a PRIME central mini-computer to a distributed architecture based on SUN servers and workstations. There are 93 SUN workstations and hundreds of PC’s among user agencies that directly access data and applications in the LOJIC GIS. LOJIC runs the latest version of ESRI ArcInfo software, and maintains approximately 60 gigabytes of data that includes a LIBRARIAN database of county-wide base and thematic mapping, and redundant ArcStorm databases for property and street centerline layers on two primary servers connected via a dedicated fiber optic network. T1 lines serve several remote locations. System expansion currently involves some new ArcInfo workstation installations, but the user emphasis has shifted from workstation to PC ArcView installations.
LOJIC has built a detailed county-wide photogrammetrically compiled planimetric and topographic (PTD) base map that contains over 100 features in 22 different data layers, and meets National Map Accuracy Standards for 1"=100’ mapping (+/-2.5 ft. horizontal; +/- 1 ft. vertical). The PTD, originally compiled in 1988-90 and updated in 1993 and 1998, serves as a reference database for many other data conversion efforts. LOJIC is developing internal procedures for the routine updating of the PTD through the use of digital orthophoto imagery.
A county-wide property layer containing nearly 285,000 parcels, detailed annotation, and tax block boundaries is maintained daily by the PVA. This database has been converted to an ArcStorm database for faster processing in the edit application and to accommodate multiple data editors working on the database. Historical lot lines are archived, and retained for reference, on a separate layer.
Spatial Databases (continued) >>
|
|
, 1.2 M)
symbol are available in Portable