Data Characteristics (Original Source) The NAPP/NHAP archive contains over 10,000 rolls of cartographic quality aerial photography acquired since 1980. All photographs are cloud free, and only contract-acceptable photographs are indexed to the map line plots. The photographic frames are maintained as original and working master archives by two support facilities, the EROS Data Center and the U.S. Department of Agriculture's Aerial Photographic Field Office (APFO).
All photographs are manually assessed to ensure that they meet the photographic, cartographic, coverage accuracy, and quality standards of each contract. Commercial flight contractors must meet a stringent list of acceptance criteria and provide proof of camera certification in order to fulfill contract requirements.
Spatial Resolution The NAPP/NHAP film has an image resolution of two meters at 1:58,000 scale. The photography can be manipulated to a variety of non-standard enlargements to generate products of desired scales.
Data Characteristics (Digital Image) All images are in MrSid format and acquired in 2000 from the contractor Greenhorne & O'Mara. The scanned digital image has a 1.5-meter resolution as provided by the contractor. Additional metadata on the digital image process is not available