County of Allegheny, PAThis dataset overlays a grid on the County to assist in locating a parcel. The grid squares are 3,500 by 4,500 square feet. The data was derived from original MAPINDX: Map Index Sheets from Block and Lot Grid of Property Assessment and based on aerial photography. Tiles are numbered in a clockwise spiral fashion starting with #1 at the point in downtown Pittsburgh. Each tile contains 16 Blocks. 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: Civic Vitality and Governance Organization: Allegheny County Department: Geographic Information Systems Group; Department of Information Technology Temporal Coverage: 2002 Data Notes: Coordinate System: Pennsylvania State Plane South Zone 3702; U.S. Survey Foot Development Notes: none Other: none Related Document(s): Data Dictionary ( https://docs.google.com/spreadsheets/d/1yyJ_RKU2brFBYU8mh8ZIr6P_Uy3iUWOQL2ZYBv398LY/edit?usp=sharing ) Frequency - Data Change: Multiple times per hour Frequency - Publishing: Daily Data Steward Name: Eli Thomas Data Steward Email: gishelp@alleghenycounty.usArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/dfb2d043543443b19c46f746e0d6a7cf_0engAllegheny County GIS Open DataPublicAllegheny County Block Index [Pennsylvania--Allegheny County]Web servicesPennsylvania--Allegheny CountyPennsylvaniaLast Modified: 2015-10-28