Ortofoto Gjerstad Municipality 2004

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。正射影像可分为适配不同应用场景的多类标准。
正射影像详情：
覆盖区域以密集与零散分布的定居点及农业用地为主。
地面分辨率通常为0.15米至0.25米，定位精度为±0.50米。