County of Allegheny, PAMap Index Sheets from Block and Lot Grid of Property Assessment and based on aerial photography, showing 1983 datum with solid line and NAD 27 with 5 second grid tics and italicized grid coordinate markers and outlines of map sheet boundaries. Each grid square is 3500 x 4500 feet. Each Index Sheet contains 16 lot/block sheets, labeled from left to right, top to bottom (4 across, 4 down): A, B, C, D, E, F, G, H, J, K, L, M, N, P, R, S. The first (4) numeric characters in a parcelID indicate the Index sheet in which the parcel can be found, the alpha character identifies the block in which most (or all) of the property lies. If viewing this description on the Western Pennsylvania Regional Data Center's open data portal ( https://www.wprdc.org ), this dataset is harvested on a weekly basis from Allegheny County's GIS data portal ( https://openac.alcogis.opendata.arcgis.com/ ). The full metadata record for this dataset can also be found on Allegheny County's GIS portal. You can access the metadata record and other resources on the GIS portal by clicking on the "Explore" button (and choosing the "Go to resource" option) to the right of the "ArcGIS Open Dataset" text below. Category: Other Organization: Allegheny County Department: Geographic Information Systems Group; Department of Information Technology Temporal Coverage: 2004 Data Notes: Coordinate System: Pennsylvania State Plane South Zone 3702; U.S. Survey Foot Development Notes: none Other: none Related Document(s): Data Dictionary ( none ) Frequency - Data Change: As needed Frequency - Publishing: As needed Data Steward Name: Eli Thomas Data Steward Email: gishelp@alleghenycounty.usArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/fd536d7506cf4d35a4f75fa76aa4c57d_0engAllegheny County GIS Open DataPublicAllegheny County Map Index Grid [Pennsylvania--Allegheny County]Web servicesPennsylvania--Allegheny CountyPennsylvaniaLast Modified: 2015-10-28