Digital Orthoimagery of Idaho (2013, 0.5-meter)

This data set contains imagery from the National Agriculture Imagery Program (NAIP). The NAIP program is administered by USDA FSA and has been established to support two main FSA strategic goals centered on agricultural production. These are, increase stewardship of America's natural resources while enhancing the environment, and to ensure commodities are procured and distributed effectively and efficiently to increase food security. The NAIP program supports these goals by acquiring and providing ortho imagery that has been collected during the agricultural growing season in the U.S. The NAIP ortho imagery is tailored to meet FSA requirements and is a fundamental tool used to support FSA farm and conservation programs. Ortho imagery provides an effective, intuitive means of communication about farm program administration between FSA and stakeholders. New technology and innovation is identified by fostering and maintaining a relationship with vendors and government partners, and by keeping pace with the broader geospatial community. As a result of these efforts the NAIP program provides three main products: DOQQ tiles, Compressed County Mosaics (CCM), and Seamline shape files. The Contract specifications for NAIP imagery have changed over time reflecting agency requirements and improving technologies. These changes include image resolution, horizontal accuracy, coverage area, and number of bands. In general, flying seasons are established by FSA and are targeted for peak crop growing conditions. The NAIP acquisition cycle is based on a minimum 3 year refresh of base ortho imagery. The tiling format of the NAIP imagery is based on a 3.75' x 3.75' quarter quadrangle with a 300 pixel buffer on all four sides. NAIP quarter quads are formatted to the UTM coordinate system using the North American Datum of 1983. NAIP imagery may contain as much as 10% cloud cover per tile.

本数据集包含美国国家农业影像项目（National Agriculture Imagery Program, NAIP）的影像数据。该项目由美国农业部农场服务局（USDA FSA）管理，设立初衷是支撑FSA聚焦农业生产的两项核心战略目标：一是在改善生态环境的同时强化美国自然资源管护；二是确保农产品高效有序地采购与分发，提升粮食安全保障水平。NAIP项目通过获取并提供美国本土农业生长季采集的正射影像（ortho imagery）来支撑上述目标。该正射影像专为契合FSA业务需求定制，是支撑FSA农场管理与保护项目的核心工具。正射影像可为FSA与利益相关方之间开展农场项目管理相关沟通提供高效直观的途径。项目通过与供应商及政府合作伙伴建立并维系协作关系，同时紧跟全球地理空间社区的发展步伐，以发掘新技术与创新方案。依托这些举措，NAIP项目可提供三类核心产品：数字正射影像图（DOQQ）瓦片、压缩县级镶嵌图（Compressed County Mosaics, CCM）以及接缝线形状文件（Seamline shape files）。NAIP影像的合同规范随时间不断调整，以适配机构需求与技术迭代，调整维度涵盖影像分辨率、水平精度、覆盖范围及波段数量。通常，飞行采集时段由FSA确定，目标设定为作物生长峰值条件阶段。NAIP的采集周期以至少每3年刷新一次基础正射影像为基准。NAIP影像的瓦片格式基于3.75′×3.75′的四分之一象限图幅，且四周均带有300像素的缓冲区域。NAIP四分之一象限图幅采用基于1983北美大地基准面的UTM坐标系进行格式化。单张瓦片的NAIP影像最大可包含10%的云量覆盖。