NYC-WTC_000187725

NYC 9/11 Public Portal Document

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I 59 4 sampling analysis for extraction of a representative sample of smaller size, by building class, before further input data were J' appended to each sample record. The sample size and composition will be discussed in a subsequent section of this chapter. The description of the following data inputs applies only to the sample of 18,650 parcels. Public Access Characteristics !-l For each sample parcel, of the representative sample of 18,650 parcels drawn from the adjusted transaction file, a set of public access characteristics was determined based upon distance measured along public streets and ways, or by airline measure in meters. For this purpose, each sample parcel was first located on tax maps by their respective block and lot identifier. Locations of green parks (not playgrounds), bodies of water, and rapid transit lines and station facilities were similarly noted on the maps. Each transit station was assigned a unique node number. Using the tax maps, the following public access characteristics were determined for each sample parcel: j|

- walking distance to nearest park with natural ground cover - walking distance to nearest rapid trans it/commuter rail station by shortest path - nearest rapid transit station coded with node number - airline distance to nearest elevated transit structure - airline distance to nearest body of water The tax maps were obtained from the Sanborn Map Company which maintains a detailed atlas of all property in New York City by borough. Transit Access Characteristics Each transit station in the New York City subway system has a unique mix of station characteristics that reflect the density and type of development surrounding the station, its position in a fixed rail corridor oriented toward Manhattan, and the effect of subway system operations and investment practices of the New York City Transit Authority which provides service in the four boroughs for the MTA. The various transit characteristics convey measures of service quantity, quality, frequency, amenity, and performance.

I The following transit characteristics were compiled by transit station. Those of the nearest transit station were coded to each sample parcel by their station node number: - elevated, open cut, or tunnel type of structure - local, express, interline transfer, or terminal type of service/ - year station opened

CITY_21MC100_006662290

NYC-WTC_000187790