This 2006 Orthoimagery Tile Index file can be used to geo-reference the individual image tiles across the City. This tile index is used in conjunction with the 2006 Orthoimagery by individual Borough download. Full metadata on the Aerial & Orthoimagery can be found at: https://github.com/CityOfNewYork/nyc-geo-metadata/blob/master/Metadata/Metadata_AerialImagery.md