manual_ground_points_improve_dense_matching_dtm_05 Published June 12, 2017 at 1040 × 807 in Integrating External Ground Points in Forests to Improve DTM from Dense-Matching Photogrammetry ← Previous Next → The wireframe view of triangulating the lowest point in each square meter (class 9). The densified ground points are clearly visible as a grid under the canopy in the target forest.