Capstone Field Mission: End-to-End Photogrammetric Survey

Capstone Field Mission: End-to-End Photogrammetric Survey

This capstone lesson brings together every skill you have developed in the course. You will independently plan, execute, process, and deliver a complete photogrammetric survey, just as a professional geospatial technician does on a real project. There are no guided steps here—your instructor approves your plan and supervises field safety, but the technical decisions are yours to make and defend.

Phase 1: Mission Planning and Pre-Flight Documentation

A professional survey begins long before the drone leaves the ground. Your mission plan is a legal and technical document. It must include:

• Site sketch showing the survey boundary, no-fly zones, take-off and landing zones, and emergency landing areas.
• Airspace verification using official FAA tools. If the site falls in controlled airspace, you must obtain authorization through LAANC or an FAA Drone Zone waiver before flight. Flying without authorization is a federal violation under Part 107.
• GCP network design with a minimum of five control points distributed across the site, not clustered at the center. Include at least two independent checkpoints—points measured in the field but withheld from the SfM adjustment so they can be used to verify accuracy independently.
• Equipment list with serial numbers for all UAS components, RTK GNSS receiver, and targets.
• Job Hazard Analysis (JHA) identifying site-specific hazards (overhead lines, vehicle traffic, unstable ground, extreme heat or cold), their likelihood, severity, and your controls. PPE requirements must be listed explicitly.
• Weather-window selection based on wind speed limits for your aircraft, cloud cover, and sun angle. Low sun angles (early morning or late afternoon) cause long shadows that degrade image texture and SfM reconstruction quality.

Your instructor must approve this document in writing before any field work begins. Do not skip this step—approval is a pass/fail gate.

Phase 2: Field Execution

Personal protective equipment is non-negotiable. A high-visibility vest must be worn whenever you are in or near active vehicle traffic. A hard hat is required on construction sites or wherever overhead hazards exist. Carry the first aid kit to the field and know its location at all times.

Set GCP targets on stable, flat ground where they will be visible in aerial imagery. Measure each target's position with the RTK GNSS receiver. Record horizontal and vertical coordinates, their estimated precision from the receiver, and the measurement time. Log the base station or network correction source (NTRIP network, local base, etc.) in your field notes.

Before launch, complete every checklist: pre-flight inspection, battery check, compass calibration if required, RC link check, and return-to-home altitude verification. Announce the flight to anyone in the vicinity. Maintain visual line of sight with the aircraft at all times unless you hold a specific FAA waiver permitting otherwise—Part 107 requires VLOS.

After the mission, verify on-site that image capture is complete by reviewing the flight log and spot-checking images for blur, gaps in coverage, or missing overlap. A second flight to fill gaps is far less costly than reprocessing with bad data or returning to the site.

Phase 3: Processing, QC, and Deliverables

Import your images into Metashape and align them using the GCP coordinates you collected. Assign GCPs to their matching targets in at least three images each. Reserve your checkpoint targets—do not assign them as control; they are for verification only.

After sparse point cloud alignment, examine reprojection residuals for each GCP. Industry standard practice targets sub-pixel residuals. Build the dense point cloud, orthomosaic, and DEM at the quality level your instructor specifies. Export all products in the coordinate reference system specified in your mission plan.

Compare your checkpoints: subtract the SfM-derived elevation and horizontal position from your RTK-measured values. These differences are your independent accuracy check. Calculate root mean square error (RMSE) for horizontal (X, Y) and vertical (Z) components separately.

Import the orthomosaic and DEM into ArcGIS Pro. Generate contours at the interval specified in your assignment. Apply proper symbology, a north arrow, scale bar, and coordinate grid to your map layout. Export all deliverables in the formats listed on the rubric.

Your final deliverable package includes: the orthomosaic (GeoTIFF), DEM (GeoTIFF), contour shapefile or geodatabase feature class, accuracy report (checkpoint RMSE table and residual screenshots), metadata file, and a concise client summary report written in plain language explaining what was done and what the products show.

Safety Summary

• Never begin field work without instructor-approved documentation.
• Wear PPE appropriate to the site at all times.
• Maintain VLOS during all flights.
• Perform all pre-flight checklists without shortcutting.
• Know the location of the first aid kit and the site emergency contact before work begins.
• If weather conditions deteriorate beyond your aircraft's limits, land immediately—no deliverable is worth a flyaway or crash.