Fig. 13
From: Small-scale topographic irregularities on Phobos: image and numerical analyses for MMX mission
Examples of boulder-poor regions: a Mars Express HRSC camera image H9574_0004_SR2 (pixel scale: ~ 3.3 m, center latitude: 55.403 °S, center longitude: 228.213 °E) in south polar stereographic projection. The illuminated area (white polygon) is about 13 km2. Only one boulder was identified (red circle); b Mars Express HRSC camera image H7926_0011_SR2 (pixel scale: ~ 2.6 m, center latitude: 3.9696 °S, center longitude: 166.034 °E). The illuminated area (white polygon) is about 12 km2