The researchers used new gravity field models and Digital Elevation Models to improve the accuracy of converting GPS elevation data in mountainous areas. By comparing the converted elevations with traditional leveling measurements, they found that high-precision gravity models can increase accuracy by up to 50%. Terrain corrections also played a role in improving the accuracy of GPS elevation conversions, especially in areas with varying terrain heights. This study shows that using advanced models can help obtain more precise elevation information from GPS data in challenging mountainous regions.