宗地测量（ancestral land survey）是指以宗地为基本单位，对其位置、面积、权属界线、界址点、建筑物和构筑物、土地利用类型等为内容所进行的地籍测绘工作。最终获得宗地平面图、界址点坐标及面积等数据和资料。
地籍信息系统的宗地合并操作时常会失效，其原因是实际测量的宗地图形与系统要求的理想化宗地图形有一定的差异。
Sometimes the operation of merging parcel in cadastral information systems may become invalidation, since there are some gaps between surveyed parcel graph and idealization graph.
在地籍测量和房地产测量中，界址点的点位精度至关重要，其直接影响宗地的面积及其四邻的位置关系。
In the survey of cadastre and real estate, it is very important for position precision of boundary point because it directly influences parcel area and position relationship around it.
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