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.
How can a very detailed orthomosaic become responsive at regional scale without replacing its full-resolution pixels? A practical guide to the acquisition choices, controlled processing test, illustrative calculation, and independent checks needed for a defensible result.
Why can a technically valid large raster be slow to browse even on a computer that can open the file? A practical guide to the acquisition choices, controlled processing test, illustrative calculation, and independent checks needed for a defensible result.
What does the acquisition date mean when a map combines images from several flights or days? A practical guide to the acquisition choices, controlled processing test, illustrative calculation, and independent checks needed for a defensible result.
How should temporary traffic be handled when cars and machinery create duplicated shapes or obstruct important ground features? A practical guide to the acquisition choices, controlled processing test, illustrative calculation, and independent checks needed for a defensible result.
Why does a mission covering the intended polygon still yield weak geometry along one side of the map? A practical guide to the acquisition choices, controlled processing test, illustrative calculation, and independent checks needed for a defensible result.
Why should the final delivery boundary often lie inside the outermost extent of the reconstructed imagery? A practical guide to the acquisition choices, controlled processing test, illustrative calculation, and independent checks needed for a defensible result.
How should a mapping team distinguish a genuine unobserved region from a display problem that looks like an empty map patch? A practical guide to the acquisition choices, controlled processing test, illustrative calculation, and independent checks needed for a defensible result.
When is color balancing useful, and when can it obscure real differences that an analyst needs to examine? A practical guide to the acquisition choices, controlled processing test, illustrative calculation, and independent checks needed for a defensible result.
Why does requesting a smaller output pixel not automatically improve the measurements supported by aerial imagery? A practical guide to the acquisition choices, controlled processing test, illustrative calculation, and independent checks needed for a defensible result.
How can a map become smoother after export while losing the small features that justified the original survey? A practical guide to the acquisition choices, controlled processing test, illustrative calculation, and independent checks needed for a defensible result.
Why does the surface chosen during orthorectification change where cliffs, machinery, and rooftops appear in the final map? A practical guide to the acquisition choices, controlled processing test, illustrative calculation, and independent checks needed for a defensible result.
What should a client ask when the word orthomosaic is used for a product containing high buildings and narrow streets? A practical guide to the acquisition choices, controlled processing test, illustrative calculation, and independent checks needed for a defensible result.
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