Orthophoto Tonstad 2003

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，可与参考坐标系绑定关联。
正射影像可依据不同应用需求划分为多种适配的标准类别。
该类正射影像：
覆盖区域以高密度、零散分布的聚居区与农业用地为主。
地面分辨率通常为0.15~0.25米，定位精度为±0.50米。