THE DRONE COLLAB JOURNAL
Explore practical photogrammetry, GNSS, IMU, GIS and remote sensing methods. Technical explanations, worked examples and field checks for the people turning aerial photographs into usable maps.
What does a perpendicular flight grid contribute beyond simply doubling the number of photographs? A practical guide to the acquisition choices, controlled processing test, illustrative calculation, and independent checks needed for a defensible result.
When does adding oblique imagery improve a project that already has a complete nadir grid? A practical guide to the acquisition choices, controlled processing test, illustrative calculation, and independent checks needed for a defensible result.
Why should sharpness and matching quality be inspected by image region instead of summarized with one score per photograph? A practical guide to the acquisition choices, controlled processing test, illustrative calculation, and independent checks needed for a defensible result.
Why can freeing additional camera parameters reduce residuals while making a flat site less reliable for measurement? A practical guide to the acquisition choices, controlled processing test, illustrative calculation, and independent checks needed for a defensible result.
How can an otherwise stable camera block develop gradual scale changes during a long acquisition? A practical guide to the acquisition choices, controlled processing test, illustrative calculation, and independent checks needed for a defensible result.
When should images be processed with separate camera groups instead of one shared calibration? A practical guide to the acquisition choices, controlled processing test, illustrative calculation, and independent checks needed for a defensible result.
What evidence is needed before a lens-distortion model should be trusted outside the central part of a photograph? A practical guide to the acquisition choices, controlled processing test, illustrative calculation, and independent checks needed for a defensible result.
Why might straight ground features bend or shift even when individual photographs appear acceptably sharp? A practical guide to the acquisition choices, controlled processing test, illustrative calculation, and independent checks needed for a defensible result.
How can a mapping team choose an aperture without assuming that the smallest opening always gives the sharpest photograph? A practical guide to the acquisition choices, controlled processing test, illustrative calculation, and independent checks needed for a defensible result.
Why does a collection with apparently identical image dimensions sometimes contain several different sharpness and geometry regimes? A practical guide to the acquisition choices, controlled processing test, illustrative calculation, and independent checks needed for a defensible result.
How should an operator respond when cloudy conditions force a choice between a slow exposure and increased image noise? A practical guide to the acquisition choices, controlled processing test, illustrative calculation, and independent checks needed for a defensible result.
Which combination of shutter time and flight speed preserves small road markings as sharp measurement features? A practical guide to the acquisition choices, controlled processing test, illustrative calculation, and independent checks needed for a defensible result.
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