UN - Geographic Information Systems
A GIS operation in which line features are combined with polygon features to determine which lines fall into which polygons. Using this operation, polygon attributes can be added to each corresponding record in the line attribute table (e.g., the district into which the road falls), or line attributes can be summarized for each corresponding polygon (e.g., total road length in a district).
United Nations, "Handbook on Geospatial Infrastructure in Support of Census Activities", Department of Economic and Social Affairs, Statistics Division, Studies in Methods, Series F No. 103, New York, 2009