The customised parameters such as spatial resolution, altitude, endlap, sidelap, and wind direction are as shown in Figure 3.

Aerial photographs Scale 1/10,000 Spatial resolution 21 cm Overlap rate Overlap: 60%; Sidelap: 30% Focal length 152.96 nun Scan resolution 1,200 dpi Field surveys Survey method Network:-based RTK-GPS Number of points 40 points Table 2.

The images had approximately 10% endlap (i.e., overlapping duplication of the same area in separate, successive images) within transects, 20% sidelap between high-altitude transects, and 75% sidelap between the central transect and the neighboring high-altitude transects in 2001.