Maine Orthoimagery Municipal Windham 2022

Maine Statewide Orthoimagery Project - During the spring of 2022 the Woolpert team acquired new 4-band (R, G, B, and NIR). The imagery was acquired covering the entire project area using UltraCam Eagle digital camera systems. All imagery was collected during the 2022 spring flying season during leaf-off conditions for deciduous vegetation in the State of Maine. The sun angle shall be 25-degrees or greater, and streams should be within their normal banks, unless otherwise negotiated. During flight planning and acquisition, a significant effort is made to limit clouds, snow (please note: small amounts of snow such as piles in parking lots, extreme shaded areas, within dense evergreens or unpopulated northern facing slopes may be acceptable), fog, haze, smoke, or other ground obscuring conditions in the imagery. In no case will 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. Woolpert produced new 8-bit, 4-band stacked color digital orthoimagery files in GeoTIFF format with TFW “world file” at a 7.5cm (3-inch) and 15cm (6-inch).缅因州全州正射影像项目（Maine Statewide Orthoimagery Project）：2022年春季，伍尔珀特（Woolpert）团队使用UltraCam Eagle数码相机系统，采集了覆盖整个项目区域的全新4波段（红（R）、绿（G）、蓝（B）及近红外（NIR））影像数据。所有影像均采集于2022年春季飞行季，此时缅因州的落叶植被正处于落叶期。影像采集需满足太阳高度角不低于25度，且河流需处于正常水位岸线范围内，另有协商约定的情况除外。在飞行规划与影像采集阶段，团队将尽最大努力规避影像中出现云层、积雪（注：少量积雪，例如停车场积雪堆、极端阴影区域、茂密常绿林内或无人居住的北坡区域的积雪可被接受）、雾、霾、烟雾或其他遮挡地面的干扰因素。单幅影像的最大云量占比不得超过5%。在发电厂、工厂或受控农业焚烧的紧邻区域内，影像中可能会出现少量蒸汽、烟雾或阴影。伍尔珀特团队生成了8位深度、4波段堆叠式彩色数字正射影像文件，采用地理TIFF（GeoTIFF）格式并附带TFW "world file"，分辨率分别为7.5厘米（3英寸）与15厘米（6英寸）。