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README.md

README.md

NYC Geospatial Metadata


This document lists metadata sources for data updated and maintained by the NYC Department of Information Technology and Telecommunications (DOITT).

Data/Layer Name Description Preview
3-D Building Model 3-D Building Models representing every NYC building present in the 2014 aerial survey. Models are based on a hybrid of the CItyGML Level of Detail (LOD) 1 (simple/prismatic buildings with flat roof detail) and LOD 2 (includes roof structure details) with approximately 100 iconic buildings modeled to LOD 2. Highlights of the model include the differentiation of building components including roof, facades, and ground plane. image
Address Point Address points are part of the Citywide Street Centerline (CSCL) database. The data represent visually identifiable and Borough President assigned addresses within NYC. Placement of the address points are approximately five feet within the respective building footprint along street front the address is assigned. image
Aerial Imagery Coming Soon image
Building Footprints Building footprints represent the perimeter outline of each building. Divisions between adjoining buildings are determined by tax lot divisions. image
Business Improvement Districts Polygons representing the extent of Business Improvement Districts (BIDs). A BID is a public/private partnership in which property and business owners elect to make a collective contribution to the maintenance, development, and promotion of their commercial district. image
Contours Continuous lines representing points of equal elevation at 2-ft intervals. image
Digital Elevation Model A bare-earth, hydro-flattened, digital-elevation surface model derived from 2010 Light Detection and Ranging (LiDAR) data. Surface models are raster representations derived by interpolating the LiDAR point data to produce a seamless gridded elevation data set. A Digital Elevation Model (DEM) is a surface model generated from the LiDAR returns that correspond to the ground with all buildings, trees and other above ground features removed. The cell values represent the elevation of the ground relative to sea level. The DEM was generated by interpolating the LiDAR ground points to create a 1 foot resolution seamless surface. Cell values correspond to the ground elevation value (feet) above sea level. A proprietary approach to surface model generation was developed that reduced spurious elevation values in areas where there were no LiDAR returns, primarily beneath buildings and over water. This was combined with a detailed manual QA/QC process, with emphasis on accurate representation of docks and bare-earth within 2000ft of the water bodies surrounding each of the five boroughs. image
Planimetrics Planimetric mapping is the capture of geographic features from aerial survey that are traditionally mapped in two dimensions. NYC DOITT first developed a planimetric database in 2000. Today, the database includes features for Building Footprints, Boardwalk, Cooling Towers, Curb, Elevation, Hydro Structure, Hydrography, Median, Misc Struct Poly, Open Space, Park, Parking Lot, Pavement Edge, Plaza, Railroad, Railroad Structure, Retaining Wall, Roadbed, Shoreline, Sidewalk, Sidewalk Centerline, Swimming Pool, Transport Structure, and Under Construction. image
Points Of Interest Point of Interest (aka Common Place) are point representations of locations that can be referred to by name and may or may not have an address. The data is a compilation of a variety of agency data and is a component of the CSCL database. image
Subway Entrances Point representing approximate location of NYC Transit Subway Entrances. image
Subway Stations Point representing approximate location of NYC Transit Subway Stations. image
Subway Lines Line representing NYC Transit Subway Lines. Lines are optimized for cartographic representation in web applications. image
Street Centerline Street Centerline is a single line representation of New York City streets representing each separate carriageway (e.g., two lines represent the divided roadway of Park Avenue South). The centerlines contain address ranges, traffic directions, road and segment types. Street Centerline is part of the Citywide Street Centerline (CSCL) database that supports multiple agencies, including the emergency 911 dispatching systems. image
WiFi Hotspots Public Wi-Fi Hotspot locations throughout the 5 boroughs including LinkNYC-Citybridge. image
Zip Code Boundaries Geographic approximation of USPS zip code boundaries. image