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Experience
in the Field
Washington
State Department of Natural Resources
James W. Sewall Company was selected to participate in a
pilot project to convert to GIS hydrography and transportation
data for one Water Resource Inventory Area in the State of
Washington. The object of the pilot project was to build experience
and methods for a similar, larger conversion effort on data
for the entire State. In December 2000, Sewall was asked to
bid on this work for the remainder of the State. Sewall's
bid was accepted for the hydrography portion, and work is
currently 80 percent complete.
The project has required the development of a comprehensive
set of procedures and macros for data cleaning, conflation
of attributes from 100k to 24k spatial data, and development
of all components of the Oregon/Washington Hydrography Framework
project, including water course and water body routines and
event tables. The system operates currently under ESRI ArcInfo
workstation software using dynamic segmentation, but has been
successfully ported to the ArcGIS 8.3 linear referencing system.
Both software packages allow creation and editing of linear
or point features in non-GIS database tables using simple
distance measurements along streams or shorelines. These database
edits are then reflected in the maps or displays of the GIS.
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