Ortofoto Gjerstad 1990

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. Orthofoto N50 represents older images and is produced specifically for the Norwegian Mapping Authority. Orto N50 has ground resolution 1.0 m. Accuracy ± 10 m.正射影像（Orthophoto）与地图具备相同的几何特性，可与参考系统建立关联。正射影像根据不同应用场景可划分为多种适配的标准类型，其中Orthofoto N50为老旧影像数据集，专为挪威测绘局生产；Orto N50的地面分辨率为1.0米，精度为±10米。