Mohave County, Arizona Parcel Development Project

 


The purpose of the project was to create county wide parcel data from the land records using both COGO and other precision input approaches. Land records, assessor map books, and some existing data in CAD or shape files were the bases of this project.

 

MRF successfully collected the following feature classes together with their attributes as required by Mohave County:

-            Boundary lines (Blocks, Lots, and Parcels)

-            Block polygon

-            Lot polygon

-            Parcel polygon

-            Tax Area Code polygon

-            Sheet, Map, and Book polygons 

-            Annotation feature classes for Lot number, Parcel number, Distances, Bearings, and Curve information

 

The MRF team had extensive experience in researching different kinds of documents, such as Record of Survey, Survey Maps, Subdivision Maps, Parcel Plates, and Assessor’s Tax Parcel Maps to identify the most appropriate data source for the data input.

 

Many customized software tools were developed for this project such as:

·         MRF attribute collection tool: to modify and populate attributes of many boundary lines simultaneously.

·         MRF vector data warp tool: used to adjust conflicts between different input data and enforce the parcel fabric to be constrained inside certain boundary lines. Seven algorithms including Affine, Helmert, Projective, 2rd to 5th order complex Polynomial algorithms had been developed to achieve high accuracy in different scenarios.

·         MRF COGO tool: used to collect traverse parameters such as distance and bearing, to calculate closure errors, to distribute closure errors using least-squares algorithm, to adjust traverse with constrains such as locking point, fixed-length traverse, and populate traverse parameters into the project’s geodatabase schema.

·         MRF QA/QC tool: included automatic checking in several data capture processes such as distance and bearing checking, boundary line vertices checking, etc.