Maine Orthoimagery Coastal Acadia 2025

This dataset consists of true color aerial imagery covering the coastline and islands of the greater Acadia region, from Brooklin, ME to Jonesport, ME. Imagery was captured at 15-cm GSD resolution and used to produce 6” orthorectified imagery with one-foot horizontal accuracy. Imagery collection dates were 06/26/2025, 06/27/2025, 07/26/2026, 07/27/2025, 08/12/2025, and 08/13/2025 during low tide conditions within two hours of spring tides. Additional atmospheric considerations were complied with including sun angle between 25 degrees and 50 degrees, no more than 10% cloud cover, and less than 10 knots of a maximum predicted wind velocity. Additionally, flights were only dispatched after a precipitation-free period of at least 48 hours. The project flight plan consisted of approximately 2,670 images on 20 flight lines with 80% endlap and 30% sidelap, with sections re-collected as needed to meet image quality standards. Airborne GPS and IMU were utilized during the acquisition to improve the aerotriangulation solution. Raw imagery was acquired using the Vexcel Eagle 80-mm Mark 3 mounted on a fixed wing aircraft and flown at an elevation of approximately 9,500 feet. Digital ortho-rectified imagery was created using the raw digital aerial imagery, surveyed ground control points, aerotriangulation, and a digital elevation model. These aerial survey products were created under contract for the State of Maine Department of Environmental Protection. Bluesky Geospatial, subcontractor, captured the raw aerial imagery and produced the digital orthophotos and related products, while James W. Sewall, contractor, provided ground control and verified that project specifications were met.本数据集涵盖大阿卡迪亚地区（greater Acadia region）的海岸线与岛屿真彩色航空影像，成像范围覆盖美国缅因州布鲁克林（Brooklin, ME）至琼斯波特（Jonesport, ME）区间。影像以15厘米地面采样距离（Ground Sample Distance, GSD）分辨率采集，据此生成了水平精度达1英尺的6英寸正射校正影像。影像采集日期为2025年6月26日、2025年6月27日、2026年7月26日、2025年7月27日、2025年8月12日及2025年8月13日，所有采集均于春汛前后两小时的低潮时段开展。本次采集严格遵循多项大气成像规范：太阳高度角介于25度至50度之间，云量不超过10%，最大预测风速低于10节；且仅在至少48小时无降水的时段后方可派遣飞行任务。本次项目飞行计划包含20条飞行航线，共计约2670张影像，航向重叠率（endlap）为80%，旁向重叠率（sidelap）为30%；并根据需要对部分区域重新采集，以满足影像质量标准。数据采集过程中搭载了机载GPS与惯性测量单元（Inertial Measurement Unit, IMU），以优化空中三角测量解算结果。原始影像由安装于固定翼飞机上的Vexcel Eagle 80-mm Mark 3相机采集，飞行高度约为9500英尺。研究团队利用原始航空数码影像、实测地面控制点、空中三角测量成果及数字高程模型（Digital Elevation Model, DEM），生成了数码正射校正影像。本航空测绘产品是为美国缅因州环境保护部（State of Maine Department of Environmental Protection）签约制作的。分包商蓝天地理空间（Bluesky Geospatial）负责原始航空影像采集及数码正射影像与相关产品的生产，主承包商詹姆斯·W·休厄尔公司（James W. Sewall）则提供地面控制点并核验项目是否符合既定规范要求。