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Create one continuous 15-second drone video, aspect ratio 9:16, showing a large hillside residential development in a quiet inland valley. Emphasize stepped foundations, engineered retaining walls, drainage channels, and houses progressing uphill. Workers wear hard hats, high-visibility vests, safety boots, gloves, and task-specific eye protection. Keep flight paths over clear access corridors with generous structure clearance.

[00-05s] Track diagonally uphill beside the lower terraces with a moderately wide 28mm-equivalent lens. A worker checks a drainage channel from stable ground while another records measurements. Clear late-afternoon light defines stone aggregate, timber formwork, and poured concrete.

[05-10s] Continue the diagonal climb and gently tilt upward, preserving the 28mm perspective. Higher terraces reveal roof framing and neatly stored material bundles. A site vehicle follows the graded switchback slowly, its suspension responding subtly to uneven ground. Warm side lighting gives the terrain credible depth.

[10-15s] Rise above the upper access road and ease backward into a broad overview, maintaining the moderately wide lens feel. Workers continue measured inspection activity below. Late-afternoon light catches finished roof sections without exaggerated glare.

Sound design: valley breeze, distant engine movement, occasional hammering, and restrained rotor hum.