A clean corrected complete Bouger anomaly would perform reasonable geological subsurface interpretation. As a part of the processing phase, the terrain correction has a significant influence. Since the terrain correction entangles a vast area, it is not easy to fulfill with land survey. Our study aimed to apply a shuttle radar topography mission digital elevation model (SRTM DEM) in addition to land survey data to overcome a satisfactory terrain correction. We have applied the SRTM data to calculate the terrain correction for the outer zone (i.e., D to M) using the Hammer method. In Mount Pandan, Indonesia, we have set this method to generate a complete Bouguer anomaly as a case study. The terrain correction in the outer zone has corrected the gravity anomaly up to 14 mGal. The result shows that the hybrid elevation data may provide sufficient terrain correction in gravity data processing for practical geological subsurface interpretation.