NHAP 84 Index

Index for 1984 National High Altitude Photography (NHAP) color infrared photos. Index features represent the centroids of individual images, which represent an area approximately 8.5 miles from east to west and 7 miles from north to south.1984年国家高空摄影（National High Altitude Photography, NHAP）彩色红外照片索引。该索引的特征为单张影像的质心，单张影像对应的覆盖区域大致为东西向8.5英里、南北向7英里。