Orthophoto Troms 2008

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: Round-trip photography covering the whole country. Ground resolution of these varies between 0.50, 0.40 or 0.25 m. From 2012, ground resolution applies 0.25 m for orthophoto from orbital photography. Accuracy ± 2 m for Ortophoto 50 (depends on the quality of the used height model)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场景划分为多种适配的标准类型。 正射影像采集说明： 采用覆盖全国全域的往返航空摄影作业方案。 该类影像的地面分辨率分为0.50米、0.40米及0.25米三个档位；自2012年起，轨道摄影生成的正射影像统一采用0.25米的地面分辨率标准。 正射影像50型的定位精度为±2米，该精度指标取决于所采用的高程模型质量。