GeoWorld

GeoWorld March 2012

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delivery in October 2010, Manitoba Hydro was able to see their initial objective realized: to create a key GIS dataset, the Property Parcel Fabric, enabling the growth of GIS applications to support their internal business units. Manitoba Hydro's Geospatial Data Services team now can easily and readily maintain the fabric with the integration of new source datasets. The tools and workflow developed in the course of the project sup- port this repeatable process. With the release of ArcGIS 10, the Cadastral Editor, which was part of the Survey Analyst extension, was renamed Parcel Editor, and the Cadastral Fabric was renamed Parcel Fabric. The Parcel Editor tools are integrated as part of ArcEditor, and the Survey Analyst extension no longer exists. Manitoba Hydro currently is upgrading its Esri 9.3 environment to version 10, and, in the near future, the fabric will be migrated. Further enhancements, such as the collection and use of ground control, will result in increased spatial accuracy. The ability to improve and tighten the hori- zontal spatial accuracy exists as core functionality within the Cadastral Fabric Data model. Source data- sets available at this time have limited inherent ties to control, but, with subsequent field work and addi- tional mapping and integration of survey plans, the survey control within the fabric can be strengthened and more fully populated. "Geospatial Data Services can now confidently lFigure 4. Parcel-puzzle pieces need to be transformed (top) and conflated (bottom). incorporate new sources of data to build a more com- plete and accurate fabric," notes Gerry. Manitoba Hydro's parcel-puzzle assembly, completed in October 2010, consisted of the following: Dominion Of the 310 AutoCAD files, 60 percent generally fol- lowed a layer specification that left more than 130 CAD files with inconsistent layers to be standardized. Many of MNC's custom batch programs and interac- tive tools provided an efficient means to clean CAD data from various topological and geometry issues, such as under-shoots, over-shoots, duplicates, zero- length lines and invalid elements. Extensive manual cleaning was required in situations where line work was scattered among various layers. MNC's team and the team at Manitoba Hydro's Geospatial Data Services worked together to clean the CAD files to a consistent structure. The Finished Puzzle Within a span of nine months, beginning with a team start-up meeting in February 2010 until the first fabric Fabric Components Points Parcel Lines Polygons Government Survey (DGS) 1,900,000 4,000,000 980,000 Property Parcel Fabric 3,300,000 7,400,000 1,500,000 Not only will Manitoba Hydro benefit from this proj- ect, but this is a significant milestone for all surveying, mapping and GIS users in Manitoba; there's now a structured, homogenous Property Parcel fabric giving complete coverage of the province. Wendy Amy is GIS manager, Martin Newby Consulting; e-mail: wendy@mncl.ca. MARCH 2O12 / WWW . GEOPLA CE . C O M 25

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