Accurate calculation of gravitational acceleration changes in each studied area helps to determine the precise location, volume and anomaly types of density below ground level. A correction that should be considered in gravity data is correcting the ruggedness adjacent to metering stations. Using topography maps of the region as well as rippling method with different radii and heights Hammer (1929) made a more accurate assessment in terms of this correction. In the current study, utilizing wavelet transform method, the process of satellite images taken from Cotopaxi volcanic region (where data are taken) has been gone through. By means of 3D image processing and simulation, a 3D topography of the area has been modeled. In other words, the calculation of topographic lines enables us to measure Hammer's radii circle sectors with more precision in each region separately. It will also assist us in correcting the ruggedness of each area.