AG 2002 10 21 (Regular) - Laserfiche WebLink

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(4) will be realigned to match the orthos and returned to us in a file that meets our current database structure. The price of the service is $1.45 per parcel, estimating 68,000 parcels for a total price of $98,600. The parcel file changes daily and this data will be sent in sections over a period of 12 weeks, therefore the final price can only be an estimate. Cost not to exceed $98,600. Request authorization to reallocate existing budget funds to implement a service contract with ROK Technologies to implement the final phase of the GIS conversion from ESRI's Librarian to ArcSDE. A geodatabase model for parcel editing in Land Records will be implemented and County workflow can be streamlined. The cost of this project is $44,900. Project Abstract This is a multi-departmental collaboration dealing with identifying layers of data with inaccuracies and resolving methods to correct the data. The layers requiring adjustments are connected to each other either physically or by database design. To insure the highest degree of accuracy possible, the data housed in GIS must meet the standards set forth by the GIS conversion to the spatial data environment rules associated with the use of ArcSDE, ArclMS, ArcGIS and the Geodatabase structure. The GIS conversion project started sometime in Spring 2001 and our department is dedicated to seeing this project accomplished. The end product will provide Cabarrus County with the most technologically accurate data available, new business processes to maintain the data, and more data access to other departments, municipalities, and the public at large. Parcels When performing the quality control checks on the orthophotography, it became apparent that the current parcel data did not match the images. The next confirmation we had that the mapping required adjustments was during the County Line meetings with Mecklenburg and surrounding counties. It was discovered that digital parcel data from the 1988 conversion was accepted with flaws, including 40' ROWs that should have been mapped at 60'. Since this was never corrected, any new information digitized in this area was 20' off. Land Records has not used aerials as a backdrop for mapping, or the extension in their software called Coordinate Geometry (COGO), a mathematical process that allows the user to put in the survey bearings to draw a parcel. GIS is developing a new interface where the mappers will have the full benefit of these tools. Correcting the parcels in house could take as much as 2 years to complete; GIS is hesitant to release the new aerials because the parcels don't match; If Land Records continues to use the current file, they will add more mistakes to the bearings and distance. GIS is developing a new data structure that will have intrinsic safeguards built in to the data, along with a new interface that should facilitate the work flow. It is my opinion that the parcel adjustments be out -sourced. The end product will be in the same data model we are using with the GIS Conversion NOTE: The parcel data will be converted from it's current format, UNIX-based Librarian tiles, to ArcSDE and Geodatabase, running with SQL on and NT Sever. Centerline To perform the necessary changes required to "best fit" the parcel data to the 2001 orthophotography, it is necessary to start with a geographically correct centerline file. This file should contain all roads in the County that have names and addresses. The file should be comprised of road names, and address ranges, high and Iow numbers on the left and right sides of the road. A good centerline file can be used by E-911 to locate call origination. The centedine can also be used with other address data to establish patterns, such as crime occurrences, school attendance, and social service clients, without divulging any personal information. The address verification project will require a current, updated centerline file to locate valid addresses and discrepancies in our data. Our current centerline file has 1347 unnamed segments. In some cases, it follows our road file, in some cases, the · Page 2