Orthophotos 2022/2023 - Flying limits (WFS Service)

The orthophotos are a geodatabase specially produced for Dresden (basic map). This depicts the urban area of the state capital Dresden with the help of equalized, georeferenced aerial images in a ground resolution of 20 cm. Based on the survey flights carried out almost annually, the original contains comprehensive material of georeferenced aerial images (vertical images) with 60% longitudinal and 30% transverse coverage. Initially used as a basis for photogrammetric stereo evaluation, these images are suitable as an information layer in a GIS, WMS or similar after differential equalization. These so-called orthophotos are largely free of positional errors (resulting from the shooting process and the elevation movement of the terrain) and have the same geometric properties of a map - supplemented by the pictorial information of a photograph. As a rule, several orthophotos are assembled into one or more orthophotomosaics, depending on whether a sheet-cut-free or tiled storage is desired or required. The orthophoto stock 2022 / 2023 with a floor resolution of 20 cm consists of 112 orthophotomosaic tiles in leaf section 1:5 000, the basis of which is in turn 500 aerial photographs (vertical images) from 2 different image flights. The southeastern half of the city area (including the city center) comes from an aerial flight from 22.04.2023, the northwestern half from an aerial flight from 11.03.2022.本正射影像（Orthophoto）数据集为德累斯顿市专项制作的地理数据库（Geodatabase，基础地图类），以地面分辨率20厘米的匀色地理配准航空影像，呈现萨克森州首府德累斯顿的城区范围。 本数据集基于近乎年度开展的航测飞行作业，原始数据包含全面的地理配准航空影像（垂直摄影影像）素材，其航向重叠度达60%、旁向重叠度达30%。该类影像最初作为摄影测量立体解译（Photogrammetric Stereo Evaluation）的基础数据源，经差分匀色（Differential Equalization）处理后，可作为地理信息系统（GIS, Geographic Information System）、网络地图服务（WMS, Web Map Service）等平台的信息图层使用。 这类正射影像基本消除了由拍摄过程与地形起伏引发的位置误差，兼具地图的几何精度与照片的图像信息。通常可根据无图幅裁切或分块存储的需求，将多幅正射影像拼接为一幅或多幅正射影像镶嵌图（Orthophotomosaic）。 本次2022/2023年度的正射影像库存数据集，地面分辨率为20厘米，包含112幅1:5000分幅的正射影像镶嵌瓦片，其原始数据源为两次不同航测飞行获取的500幅垂直摄影航空影像。德累斯顿城区的东南半区（包含市中心）影像取自2023年4月22日的航测飞行数据，西北半区影像则取自2022年3月11日的航测飞行数据。