NAPP = National Aerial Photography Program 1:40,000 Scale: 1987 - 2007
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'The National Aerial Photography Program (NAPP) was coordinated by the USGS as an interagency project to acquire cloud-free aerial photographs at an altitude of...
国家航空摄影计划（National Aerial Photography Program，NAPP）由美国地质调查局（United States Geological Survey，USGS）统筹协调，作为一项跨机构协作项目，旨在获取特定高度下的无云航空摄影影像……
