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GIS and Parcel Mapping: Georeferencing, Edgematching, and Annotation in the City of Philadelphia

This symposium discusses the process of georeferencing, edgematching, and annotation in GIS and parcel mapping in the City of Philadelphia. It covers the historical context, timeline, and advancements made in the department of records. The symposium showcases the use of orthophotography, planimetrics, and edgematching techniques to create accurate and annotated parcel maps. The citywide integration of map sheets and the expanded usability of GIS software are emphasized. Various city agencies and initiatives have leveraged these technologies for licenses, inspections, planning, redevelopment, and housing authority purposes.

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GIS and Parcel Mapping: Georeferencing, Edgematching, and Annotation in the City of Philadelphia

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  1. PACSCL Geo-History SymposiumDepartment of RecordsGIS and Parcel Mapping:Georeferencing, Edgematching and Annotation City of Philadelphia December 2005

  2. IT Timeline and Historical Context Street Centerline rectified to Orthophotography Records Department digitizes Registry Maps Orthophotography and Planimetrics created Edgematching and DPR Planning Commission scans parcels Land Records Metabase designed Edgematching and DPR Pilot Standardization of GIS software Street Centerline is developed Orthophotography Update Citywide annotation DOR Scrub Editing 1991 2005

  3. City Environment • Commitment to GIS • Infrastructure • Policies • Standard Software – ESRI product line • Facilitates the Exchange of Data among City Agencies

  4. Parcel Layer – Accuracy / Quality • Scanned • Geo-referenced • Orthophotography • Control Points • Edge-matched • Seamless Integration of Map Sheets • Expanded ability to scroll across entire City • Increases usability • Annotated • Engineering Accuracy Preserved

  5. Typical DOR Parcel Registry Map

  6. More than 4,800 Maps Tile Across Philadelphia 3 Parcel Registry Maps Located in Tile 14

  7. Georeferencing 3 Individual Parcel Maps Area of Parcel Map Overlap

  8. Georeferencing with Orthophotography • Curb lines are extracted from orthophotos • Scanned parcel maps are scaled and rotated to line up with curb lines

  9. Another Perspective on Georeferencing

  10. Pre Edgematching and DPR

  11. Post Edgematching and DPR

  12. Scanned Parcel Registry Map

  13. Existing GIS Parcel Features

  14. Parcel Features Viewed with Annotation

  15. Highly Accurate Parcel Layer as Citywide Base Map Licenses and Inspections Planning Commission Board of Revision of Taxes Neighborhood Transformation Initiative Department of Records GIS Parcel Layer Redevelopment Authority Housing Authority

  16. Parcel Maps Leveraged by Applications • Internet Parcel Explorer • Photo Archives • Culture Browser

  17. Thank You! City of Philadelphia Department of Records Acknowledgement M&M Solutions LLC

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