166 Appendix A
Buildings Transportation Facilities
Fire Stations Other
Police Stations Parks
Hospitals and Health Centers Signposts
Educational Centers Street Centerlines and Inter-Historical Buildings sections
Municipal Buildings Service Vents Utility Buildings
For each data category in which names are'associated with a data item, such as streets or buildings, a data base of names will be kept for retrieval and plotting. The planimetric digital data base will allow the flexibility of plotting with reference to any of the following three horizontal reference datums: South Zone of the Pennsylvania State Plane Coordinate System, latitude and longitude, or Zone 18 of the Universal Transverse Mercator (UTM) 6° Grid. The system will provide for computer plotting of any specific portion of the data base at any specified scale in any combination of data layers (Smith, 1982).
Within the digital planimetric base map area of the RMLR II pilot project there exist approximately 4300 deeded properties, including over 2000 parcels, 2000 condominium units, and 13 airspace rights. Twenty-two tax plats are associated with the area. Using the computer-plotted basic map features and buildings as a base map for new tax plats, the city of Philadelphia Records Department will be adding parcel boundary lines, street right-of-way lines, and associated text. The parcel boundary lines will then be digitized into a digital data layer, parcel centre ids determined, and parcel-specific information added to the data base from the files of the city of Philadelphia Board of Revision of Taxes, to be merged with the information from the Records Department.
In order to ensure that the digital data tapes will be compatible with the operating systems of the major participants in the project, IBM IGGS Interface Format has been specified. This will permit greater in-house use of the generated digital data in an operational environment, for additional testing and procedure validation.
By maintaining detailed cost records of each phase of the RMLR II pilot project, the RMLR steering committee will have a firm base for the formulating of future project decisions.
With the awarding of the RMLR II contract, the city of Philadelphia, Philadelphia Electric Company, Philadelphia Gas Works, and Southeastern Pennsylvania Transportation Authority (SEPTA), along with the Delaware Valley Regional Planning Commission are continuing their commitment to go forward together, at a cautious pace, in building a modern, large-scale digital-mapping system. These leaders of the RMLR program appear to have developed a successful formula for joint sponsorship and use of the mapping system by the local government and the major utilities, which has eluded so many others.sions, and corrections as required (Delaware Valley Regional Planning Commission, 1980.)o record the basic geography ofhe official map act applicable to villages and towns as well as cities.ivethe quality of the finished maps, they require that the actual relocation of the Public Land Survey corners be done by a local land surveyor employed as a sub-ue a request for proposals (RFP) (Motto, 1980). The purpose of the specification is to define theover) Economy IS—