Photogrammetric ground control points (GCPs)

<p>Ground control points (or GCPs) are points on the ground with <strong>known coordinates</strong>.</p> <p>In an aerial mapping survey, GCPs are points that the surveyor can precisely pinpoint: with a handful of known coordinates, it’s possible to accurately map large areas. </p> <p>The data can be downloaded at www.geoportal.gov.pl in the "data for download" layer group - photogrammetric data - photogrammetric matrix - photopoints</p> <pre> </pre>地面控制点（Ground Control Points，简称GCPs）是地面上坐标已知的点位。 在航空测绘作业中，GCPs是测量人员可精确定位的点位；仅需少量已知坐标，即可完成大范围区域的精准测绘。 该数据集可从www.geoportal.gov.pl的「可下载数据（data for download）」图层组——摄影测量数据——摄影测量矩阵——摄影点位中下载。