Photo by Dovre, 1972

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，可与参考坐标系建立关联。正射影像可依据不同应用需求，划分为多种适配的标准类型。该类正射影像详情：覆盖区域以密集、零散的居民聚落及农业用地为主；地面分辨率通常大于0.15米，区间为0.15米至0.25米，定位精度为±0.50米。