City of Philadelphia

PACSCL Geo-History Symposium

Department of RecordsGIS and Parcel Mapping:Georeferencing, Edgematching and Annotation December 2005

Pla

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IT Timeline and Historical Context

Str

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are

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Rec

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Reg

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aps

1991 2005O

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Upd

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Land

Rec

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DO

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Edi

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City

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City Environment

Commitment to GIS

Infrastructure

Policies

Standard Software – ESRI product line

Facilitates the Exchange of Data among City Agencies

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

Typical DOR Parcel Registry Map

More than 4,800 Maps Tile Across Philadelphia

3 Parcel Registry Maps Located in Tile 14

Georeferencing 3 Individual Parcel Maps

Area of Parcel Map Overlap

Georeferencing with Orthophotography

1. Curb lines are extracted from orthophotos2. Scanned parcel maps are scaled and rotated to line up with curb lines

Another Perspective on Georeferencing

Pre Edgematching and DPR

Post Edgematching and DPR

Scanned Parcel Registry Map

Existing GIS Parcel Features

Parcel Features Viewed with Annotation

Highly Accurate Parcel Layer as Citywide Base Map

Department of RecordsGIS Parcel Layer

Parcel Maps Leveraged by Applications Internet Parcel Explorer

Photo Archives

Culture Browser

City of PhiladelphiaDepartment of Records

AcknowledgementM&M Solutions LLC

Thank You!