Digital Orthophoto Color and Infrared (DOP RGBI) Operat 2021260

An orthophoto is a distortion-free and true-to-scale image of the Earth’s surface. Op-Color has been made from analog (medium-scale image flights of 1:15 000), since 2010 from digital aerial images (flyings from 2010) in real color (RGB), false color (CIR – near-infrared color range) or 4-channel images (RGBI). These orthophotos are produced in a floor resolution (pixel size) of 20 cm (from 2010) or 25 cm.正射影像（orthophoto）是无畸变且比例尺与实际完全匹配的地球表面影像。Op-Color数据集早期采用模拟航摄资料制作，对应1:15000的中比例尺航摄飞行；自2010年起改用2010年起开展航摄飞行获取的数字航空影像，可生成真彩色（RGB）、假彩色（CIR——近红外波段色域）或4波段影像（RGBI）。该类正射影像的地面分辨率（像素尺寸）为20厘米（2010年起）或25厘米。