2021 New Hampshire NAIP 4-Band 8 Bit Imagery

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计划（National Agriculture Imagery Program, NAIP）的影像数据。该计划由美国农业部农场服务局（Farm Service Agency, USDA FSA）主管，其设立旨在支撑农场服务局两项围绕农业生产的核心战略目标：一是强化美国自然资源管护并改善生态环境，二是确保农产品高效有序地采购与分发，以提升粮食安全保障水平。NAIP计划通过采集并提供美国本土农业生长季获取的正射影像来支撑上述目标。该正射影像针对农场服务局的业务需求定制开发，是支撑其农场管理与生态保护项目的基础性工具。正射影像为农场服务局与利益相关方之间开展农场项目管理相关的沟通提供了高效直观的途径。项目通过与供应商及政府合作伙伴建立并维系合作关系，同时紧跟全球地理空间社区的发展步伐，来识别并应用新技术与创新成果。基于上述工作，NAIP计划推出三大核心产品：数字正射四分图幅瓦片（Digital Ortho Quarter Quadrangle tiles, DOQQ tiles）、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更新，以契合机构业务需求与技术进步，更新内容涵盖影像分辨率、平面精度、覆盖范围及波段数量等维度。通常，影像采集季由农场服务局确定，目标时段为作物生长峰值期。NAIP的采集周期基于基础正射影像至少每3年更新一次的标准。NAIP影像的瓦片格式采用3.75'×3.75'的四分图幅，且四周均带有300像素的缓冲区。NAIP四分图幅采用基于1983北美大地基准面（North American Datum of 1983）的UTM坐标系进行格式化。单幅NAIP瓦片的云覆盖比例最高可达10%。