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In the cadastral database model, atomic polygons were aggregated to the level of parcel polygons by a unique PIN. This was accomplished by using a master PIN object class (table) that is linked by the key REF_PIN to the parcel feature class. REF_PIN is unique for each parcel polygon shown on the tax map. The PIN table is needed because a single parcel polygon can represent more than one parcel as in the case of condominiums and elevation specific parcels. The attribute POLYTYPE is a flag that specifies that this condition exists and indicates the need to query additional tables. In addition to parcels that have only one PIN per polygon, the PIN table accommodates PINs for condominiums, leaseholds, and elevation-specific parcels. The PIN table contains records for each unique 14-digit PIN (the basic 10-digit PIN plus a 4-digit unit number for condominiums and leaseholds). The base 10-digit PIN is included in the table as well as the four components, PINA, PINSA, PINB, and PINP, which comprise the 10-digit PIN. The Cadastral data set is a depiction of taxable properties in Cook County with selected associated features for enhancement. The purpose of creating this cadastral geodatabase was to update previous data sets and integrate the data with other data sets based on a common geography (digital orthophotoimagery), and serve as a standard cadastral database for virtually all cadastral applications in the County. The creation of this digital cadastral database will allow Cook County to supplant hard-copy tax maps, which are used to illustrate parcel boundaries, with a comprehensive GIS database referenced to an accurate planimetric base map and digital orthoimagery. The County will thus be able to perform maintenance of its land records in the GIS database and automate queries and map output. The Cook County Assessor will not use this database for assessment purposes (such as area of the property). However, the tax map serves the Cook County Clerk to graphically depict legal descriptions of all parcels in Cook... |
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In the cadastral database model, atomic polygons were aggregated to the level of parcel polygons by a unique PIN. This was accomplished by using a master PIN object class (table) that is linked by the key REF_PIN to the parcel feature class. REF_PIN is unique for each parcel polygon shown on the tax map. The PIN table is needed because a single parcel polygon can represent more than one parcel as in the case of condominiums and elevation specific parcels. The attribute POLYTYPE is a flag that specifies that this condition exists and indicates the need to query additional tables. In addition to parcels that have only one PIN per polygon, the PIN table accommodates PINs for condominiums, leaseholds, and elevation-specific parcels. The PIN table contains records for each unique 14-digit PIN (the basic 10-digit PIN plus a 4-digit unit number for condominiums and leaseholds). The base 10-digit PIN is included in the table as well as the four components, PINA, PINSA, PINB, and PINP, which comprise the 10-digit PIN. The Cadastral data set is a depiction of taxable properties in Cook County with selected associated features for enhancement. The purpose of creating this cadastral geodatabase was to update previous data sets and integrate the data with other data sets based on a common geography (digital orthophotoimagery), and serve as a standard cadastral database for virtually all cadastral applications in the County. The creation of this digital cadastral database will allow Cook County to supplant hard-copy tax maps, which are used to illustrate parcel boundaries, with a comprehensive GIS database referenced to an accurate planimetric base map and digital orthoimagery. The County will thus be able to perform maintenance of its land records in the GIS database and automate queries and map output. The Cook County Assessor will not use this database for assessment purposes (such as area of the property). However, the tax map serves the Cook County Clerk to graphically depict legal descriptions of all parcels in Cook... |
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David Orr, Cook County Clerk, was instrumental in the process of creating digital cadastral data layers for Cook County, Illinois. |
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This data set contains parcel polygon, tax block polygon, and leasehold polygon features classes, as well as several object classes (tables), for Cook County, Illinois, including a PIN table, a Ref_PIN table, a condo table, and a condo miscellaneous table. The cadastral data for Cook County have previously not been digital nor automated. This project is the initial automation for this information. This database was designed to represent a continuous, non-overlapping spatial database accounting for all land area in Cook County. |
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Under no circumstances may the data be redistributed or made available over a network without explicit permission from the Cook County Department of Office Technology. It is required that the Cook County Board of Commissioners be cited in any products generated from the data. The following source citation must be included: "Source: Cook County, Illinois 1:1200-Scale Parcel Digital Data Set, Version 1.0, June 2002." |
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Parcel |
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["Thorton","Bremen","River Forest","Bloom","New Trier","Jefferson","North","Chicago","property","Worth","Barrington","cadastral","condominium","northeastern Illinois","Maine","South","Cicero","Elk Grove","parcel","Hyde Park","Leyden","Calumet","lease","PIN","Stickney","Lyons","Hanover","Wheeling","Oak Park","tax map","Palos","Orland","tax block","Palatine","Norwood Park","Rich","Illinois","Evanston","Northfield","Riverside","West","Lemont","Niles","Cook County","Lake View","Rogers Park","Lake","Proviso","Berwyn","Schaumburg"] |
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en-US |
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