Lidar data from the southern portion of Guam was used to create elevation and slope maps at one-half, one and two arc second resolutions. The maps were compared and the data collected from the slope maps indicated that at one and two arc second resolution the data was being generalized. The lower resolution maps reported lower average slope, maximum slope, and standard deviation values. This indicates smoothening of elevation data points used in the lower resolution slope grids. Therefore, the one-half resolution grids provided the most accurate representation of the used data.