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Experience
in the Field
Jackson
County, Mississippi
In 2000, Jackson County contracted James W. Sewall Company
to convert existing tax parcel maps to ArcInfo digital format
for use in the County’s GIS. To initiate the process,
the County had scanned the maps, including 94,850 parcels
in a 731-square-mile area. To comply with the Mississippi
Tax Commission Rule 6, the County was reformatting the scans
to a new sheet layout at three map scales (1"=400', 1"=200',
1"=100') and georeferencing them to existing digital
orthophotography produced from 1994 aerial photography. To
each parcel, County staff assigned a routing number that corresponded
to a record within the County Assessor’s CAMA file (Bluewater).
To assist the County with this project, Sewall converted
the parcel data to ArcInfo, utilizing lines of occupation
shown on the orthophotography as an accurate base. During
the conversion process, Sewall technicians maintained the
shapes, sizes, and integrity of the existing lots and followed
lines of occupation, ensuring a fit within agreed project
tolerances. Sewall did not apply rubber-sheeting methods to
achieve the fit. In an automated process, Sewall also linked
existing Bluewater data sets with selected graphic objects.
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