2018 Aerial Imagery

Maine Statewide Orthoimagery Project - All imagery was collected during the 2018 Spring flying season during leaf-off conditions for deciduous vegetation in the State of Maine. The sun angle was at 30-degrees or greater, and streams were within their normal banks. During the flight planning and acquisition, a significant effort was made to limit clouds, snow, fog, haze, smoke, or other ground obscuring conditions in the imagery. In no case does the maximum cloud cover exceed 5% per image. Within the immediate areas of power plants, factories, or controlled agricultural burns some steam or smoke and/or shadows may be visible on imagery. The Maine GeoLibrary Board (MEGIS) has developed a statewide, 5-year, rotating orthoimagery acquisition program for Maine to facilitate state, regional and local government GIS base mapping in an efficient and cost effective program. The State of Maine will use digital orthoimagery for the development of various base map products in a computerized GIS that will support the needs of the state and multiple stakeholders through applications, such as, multi-jurisdictional homeland security mapping applications, state and county emergency management applications, regional and local planning, state and local public safety applications, economic development and other GIS business objectives.缅因州全域正射影像项目（Maine Statewide Orthoimagery Project）：所有影像均采集于2018年春季飞行作业季，此时缅因州境内的落叶植被处于落叶期。太阳高度角不低于30度，河道均处于正常水位岸线范围内。在飞行规划与影像采集阶段，项目团队已尽最大努力规避云、雪、雾、霾、烟雾及其他会遮挡地面的干扰因素，单幅影像的最大云量占比均不超过5%。仅在发电厂、工厂或受控农业焚烧的紧邻区域内，影像中可能会出现蒸汽、烟雾及（或）阴影。缅因州地理图书馆委员会（Maine GeoLibrary Board，缩写MEGIS）已为缅因州制定一项为期5年的周期性轮换式全域正射影像采集计划，旨在以高效且经济的模式，为州、区域及地方政府的地理信息系统（Geographic Information System，GIS）基础测绘提供支持。缅因州将依托该数字正射影像，在计算机化GIS平台中开发各类基础地图产品，通过多辖区协同国土安全测绘、州及县级应急管理、区域与地方规划、州及地方公共安全、经济发展及其他GIS业务应用场景，满足本州及多方利益相关者的相关需求。