A method, in particular a computerized method, for classifying measuring points in a topobathymetric data set, having the following steps: - obtaining a topobathymetric data set which contains at least one topobathymetric measurement (Mj) having a registered reflection signal (R t1) at time t1, from which a topographical measuring point (Xm) is calculated; - obtaining classified starting points (Xs) having at least the known property of whether the respective starting point (Xs) belongs to a water surface or to a land surface; - calculating a first quality indicator as a function of the distances between the measuring point (Xm) and the starting points (Xs); - calculating a second quality indicator based on the at least one topobathymetric measurement (Mj) which was used to calculate the measuring point (Xm) as a function of one of more of the following features: - the first reflection coefficient (R x1) associated with the reflection signal (R t1); - at least one further registered reflection signal (R t2) at time t2; - the time interval t2-t1 between two reflection signals (R t1, R t2); - the second reflection coefficient (R x2) associated with the reflection signal (R t2); - a reflection coefficient (R xs) of one of the starting points (Xs), preferably of the starting point having the smallest distance from the measuring point (Xm); - calculating a binary classification function as a function of the first and second quality indicator (Q1, Q2); - classifying the measuring point (Xm) as a land surface or water surface on the basis of the classification function. - obtaining a topobathymetric data set which contains at least one topobathymetric measurement (Mj) having a registered reflection signal (R t1) at time t1, from which a topographical measuring point (Xm) is calculated; - obtaining classified starting points (Xs) having at least the known property of whether the respective starting point (Xs) belongs to a water surface or to a land surface; - calculating a first quality indicator as a function of the distances between the measuring point (Xm) and the starting points (Xs); - calculating a second quality indicator based on the at least one topobathymetric measurement (Mj) which was used to calculate the measuring point (Xm) as a function of one of more of the following features: - the first reflection coefficient (R x1) associated with the reflection signal (R t1); - at least one further registered reflection signal (R t2) at time t2; - the time interval t2-t1 between two reflection signals (R t1, R t2); - the second reflection coefficient (R x2) associated with the reflection signal (R t2); - a reflection coefficient (R xs) of one of the starting points (Xs), preferably of the starting point having the smallest distance from the measuring point (Xm); - the first reflection coefficient (R x1) associated with the reflection signal (R t1); - at least one further registered reflection signal (R t2) at time t2; - the time interval t2-t1 between two reflection signals (R t1, R t2); - the second reflection coefficient (R x2) associated with the reflection signal (R t2); - a reflection coefficient (R xs) of one of the starting points (Xs), preferably of the starting point having the smallest distance from the measuring point (Xm); - calculating a binary classification function as a function of the first and second quality indicator (Q1, Q2); - classifying the measuring point (Xm) as a land surface or water surface on the basis of the classification function.