Maine Orthoimagery Municipal Rangeley 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，Woolpert团队采集了全新的4波段（红、绿、蓝及近红外（NIR））影像。本次采集采用UltraCam Eagle数码相机系统，覆盖了整个项目区域。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，且溪流需处于正常水位岸线范围内，除非另有协商约定。在飞行规划与影像采集过程中，团队将尽最大努力规避影像中出现云、雪（注：少量积雪，如停车场积雪堆、极端阴影区域、密集常绿林内或朝北的无人山坡处的积雪可被接受）、雾、霾、烟雾或其他遮挡地面的干扰因素。单张影像的最大云量不得超过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、烟雾和/或阴影。Woolpert最终生成了8位深度、4波段堆叠的彩色数字正射影像文件，格式为GeoTIFF，并附带TFW世界文件，分辨率分别为7.5厘米（3英寸）和15厘米（6英寸）。