🚁 Drone/UAV Survey

0/5 steps

STEP 1

GCP Planning

STEP 1 — PLAN GCPS
Design Ground Control Point distribution.

Why we do this:
GCPs tie drone images to real coordinates.
Without GCPs, accuracy is poor.

Requirements:
• Minimum 5 GCPs (more = better)
• Evenly distributed across area
• In corners and centre
• Visible from air

In METARDU Drone Tools:
→ Enter survey boundary
→ Generate GCP positions
→ Export coordinates

🔗Open METARDU Tool → Create Project

STEP 2

GCP Setting Out

STEP 2 — PLACE GCPs
Mark GCPs on ground and measure.

Process:
• Navigate to each GCP position
• Place target (panel, paint, marker)
• Survey with total station or GNSS
• Record coordinates

Accuracy target:
• < 2cm horizontal
• < 3cm vertical

🔗Open METARDU Tool → Create Project

STEP 3

Flight Planning

STEP 3 — PLAN FLIGHT
Configure drone mission.

Settings:
• Flying height (affects GSD)
• Front overlap (75-80%)
• Side overlap (60-70%)
• Grid pattern

GSD Calculator:
GSD = (sensor width × flight height) / (focal length × image width)

🔗Open METARDU Tool → Create Project

STEP 4

Process Data

STEP 4 — PROCESS IMAGES
Run photogrammetry software.

Steps:
1. Import images
2. Add GCP coordinates
3. Tie points
4. Generate mesh
5. Create DEM/DSM

Software options:
• Pix4D, Agisoft, DroneDeploy

🔗Open METARDU Tool → Create Project

STEP 5

Accuracy Check

STEP 5 — VERIFY ACCURACY
Compare independent check points.

In METARDU Drone Tools:
→ Enter surveyed coordinates
→ Enter drone-computed coordinates
→ Calculate RMSE
→ Check against accuracy class

Classes:
• Class I: ≤ 7.5cm / 15cm
• Class II: ≤ 15cm / 30cm
• Class III: ≤ 37.5cm / 75cm

🔗Open METARDU Tool → Create Project