Method for estimating number of victim families along river in mountain torrent disaster on basis of GIS (geographic information system)

The invention discloses a method for estimating the number of victim families along a river in a mountain torrent disaster on basis of a GIS (geographic information system). The method comprises steps as follows: a), k river points are selected at intervals from the upstream to the downstream along the longitudinal section of a river channel; b), resident information including the name of a householder, family population, the height of the homestead and longitudes and latitudes of a house is acquired; c), each house is projected to a plane where a river fold line is located and which is perpendicular to the earth's surface; d), the river points and projection coordinates are sequenced; e), a river curve is drawn; f), projection coordinates of each house are drawn; g), the number of the victim families is predicted. By means of the estimation method, the height of the homestead of a resident and the height of the nearest riverbed are considered, so that the prediction is more accurate, accurate estimation of t