Profile lines of all kernels used to generate the different morphologies of different types of craters. The simple crater 1 (blue line), simple crater 2 (red line), fresh crater (green line), and complex crater (yellow line) correspond to kernel_{1, 2, 3, 4}, resp. The kernel₁ is a standard Gaussian function with the true height H_t = 1, the apparent diameter . In kernel₂, H_t = 1 and (see Eqs. (4) and (5)). The fresh crater is created using kernel₃ with H_t = 1,  D_a = 1.31 and extra parameters D_rim ≈ 2,  H_rim ≈ 0.309, which represent the rim-to-rim diameter and the rim height, respectively (see Eqs. (7)–(11)). The new degradation length, the rim-to-rim diameter and the rim height of the complex crater are defined as D_rim = 2,  H_rim = 0.471,  H_c = 0.2 (see Eqs. (13)–(16)).