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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:
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Boundary lines (Blocks, Lots, and Parcels)
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Block polygon
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Lot polygon
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Parcel polygon
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Tax Area Code polygon
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Sheet, Map, and Book polygons
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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:
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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.
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