In a method of enabling improved radio network planning for a predetermined geographical area in a telecommunication network, providing a plurality of data sampled at irregularly distributed measurement points, each data sample being represented by at least two geographical coordinates and at least one parameter value representative of a physical quantity associated with a radio network planning procedure, and providing a regular grid comprising a plurality of grid bins. For each such measurement point locating a subset of said grid bins within a predetermined distance from the measurement point and determining a respective contribution from the measurement point at each located grid bin in the subset, based at least on a respective distance between the data point and each grid bin and the at least one parameter value of the measurement point, wherein at least a subset of the grid bins each receive contributions from at least three associated measurement points referred to as contributing measurement points, and wherein each such grid bin is referred to as an active or triggered grid bin. Finally, determining, for each active or triggered grid bin a value of the parameter based on the determined respective contributions from the associated contributing measurement points.