Photo: Fron-Gausdal 1977

Orthophoto has the same geometric properties as a map and can be linked to a reference system. Orthophotos are divided into different orthophoto standards suitable for different purposes. Photo by Ortho: Covers areas that mainly consist of dense and scattered settlements and agricultural areas. Ground resolution is usually > 0.15 – 0.25 m. Accuracy ± 0.50 m.正射影像（Orthophoto）具备与地图一致的几何特性，且可关联至参考坐标系。 正射影像可依据不同应用场景划分为多种适配的标准类别。 正射影像详情： 覆盖区域以高密度且分散的聚居区与农业用地为主。 地面分辨率通常为0.15米至0.25米以上，定位精度为±0.50米。