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valve, are ~ror~ed in }}~e-GIS database. This allows the
<br />information co be searched, put into visual form, and analyzed.
<br />The directors 'knew a GIS system would create a more secure
<br />environment for the vi[lace's current data. Rather than storing
<br />information on ?aper or ~elying on institutional knowledge,
<br />the7 felt GIS would help thc staff become better organized and
<br />allow them easier access to more up-to-date'information.
<br />would also effectively minimize r. he likelihood of information
<br />being lost, and the staff would no longer have to refer to
<br />potentially obsolete county and village maps for requests made
<br />to r_he village.
<br />
<br />Orthophotogrophy is often used as a
<br />base map For GIS because of its
<br />accuracy, resolution, and the detail
<br />obtained during the orthopho~o
<br />production process.
<br />
<br /> In 1994, after completion o£an internal GIS needs
<br />assessment, the engineering department took a step toward
<br />GIS by obtaining orrhophotography and digital mapping.-
<br />Orrhophotography is digital photo imagery covering a large
<br />area chat is geographically oriented co ground coordinates
<br />and offers a controlled photo base to support and enhance
<br />mapping applications. Orthophorography is often used as a
<br />base map for GIS because of its accuracy, resolution, and the
<br />detail obtained during the otthophoto production process.
<br />Accurate base maps can be created from orthophotography
<br />because the aerial imagery has been assembled so the
<br />horizontal scale is continuous. Derails such as roads,
<br />centerlines, curbs, trees, driveways, and ocher features of the
<br />built and natural environment can be mapped from the
<br />orthophoros. They also can be measured off the
<br />orthophotography in a digital or paper format.
<br /> In 1995, the village hired The Sidwell Company, a St.
<br />Charles, Illinois,-based GIS and mapping services firm, to move
<br />the municipality's digital CAD map into a GI$. Sidwell's
<br />technicians tied r_he features o£ Gurnee's digital map co database
<br />content with the map tied to a coordinate system. Features such
<br />az roads, parcels, or driveways now have a specific geographic
<br />location defined in terms of x, y coordinates, such as latitude or
<br />longitude or State Plane Coordinate System--another system
<br />for defining and locating points on the earth. Mark Kemper, a
<br />project manager with Sidwell, says, "Moving a community into
<br />a GIS can reveal inconsistencies with data such a~ PINs [parcel
<br />identification numbersl, addresses, and water utilir7
<br />identification numbers, tt is an excellent tool for checking thi:
<br />accuracy, of attributes linked to maps; a tangible benefit of
<br /> ·
<br />implementing a GIS that is often overlooked."
<br /> In 1998, zoning classifications were brought into the GIS by
<br />Eric Venden, Gurnee's GIS coordinator. Venden added the
<br />zoning classifications for each of the municipality's 15,000
<br />parcels by overlaying zoning classes with the village's tax parcel
<br />information. Although there are many data secs within Gurnee's
<br />
<br />Shannon A~-mstrong i~ a munic,~, al account manager with The
<br />Sidwetl Comport3; a Sr. Charles, Jlliav&-based GJS and mapjoing
<br />services firm. T/Je websire cm~ be founa' ar www. sidwellco, com.
<br />
<br />The orrhophoro production process allows the
<br />Gurnee stajSC to meaxure the features displayed tn
<br />this subdivision, including roadways, sidewalk},
<br />and lots in a digital environment. The
<br />orrhophotography is geographically oriented to
<br />ground coordinates in the GIS.
<br />
<br />The zoning staff can measure the land uses featured
<br />on this georeferenced or/hophoro. O'Ptaine Road curs
<br />d,'ough Gurnee's Public Zoning District, which
<br />includes several municipal bnildings and facilities,
<br />including the village hall to the right of t/Je pond. a
<br />portion of the high school'~ recreational fields, and a
<br />library. On the lej¢ (wesO side of O'S[nine are the
<br />librace and a vacant sire for a new police station,
<br />which is ~tna~'r construction.
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