An orthoimage is remotely sensed image data in which displacement of features in the image caused by terrain relief and sensor orientation have been mathematically removed. Orthoimagery combines the image characteristics of a photograph with the geometric qualities of a map. For this dataset, the natural color orthoimages were produced at 0.5 feet (6 ") pixel resolution. The design accuracy is estimated to meet NMAS standards. Each orthoimage provides imagery for a 2,500 by 2,500 feet block on the ground. The projected coordinate system is New York State Plane with a NAD83 datum. There is no image overlap been adjacent files. The ortho image filenames were derived from the northwest corner of each ortho tile using the first three digits of the northing and easting coordinates referenced to the tile grid standadized by Westchester County GIS.