Civil application reference · Evidence C
Choose the decision before the aerial image
A facilities manager may need to show a colleague how a courtyard connects to a loading area, mark which building contains an asset, or estimate the area of a surface. Those are different requests. An FPV walkthrough can explain visible spatial relationships; a measurement task needs an appropriate spatial data product and evidence that it is accurate enough for that use.
The choice tree below is an original planning aid for civilian property work. It is not a flight plan, a customer project or a statement that the aircraft pictured on this page can produce survey imagery.
- Does the recipient need to understand a space by watching a sequence?Choose a visual walkthrough.Accept a clearly labeled film that shows the relevant visible relationships.
- Must the recipient locate an observation against existing site records?Choose a location-referenced output.Accept linked photographs or spatial imagery with a documented reference the site team can use.
- Will a distance, area or map overlay influence the decision?Define a geospatial requirement.Request a suitable corrected image product and documented positional quality; a sharp video frame is not a substitute.
Location and geometry are separate requirements
An asset label such as “Courtyard, east entrance” can connect a photograph to a facilities record without claiming a measured position. If the team needs coordinates, specify the coordinate reference system and the positional quality needed for the intended use. Do not treat a location tag as proof that every point in the image is correctly placed.
USGS explains orthoimagery as imagery corrected for displacement caused by terrain and camera tilt, giving it map-like geometric properties and uniform scale. Merely adding coordinates to a picture does not demonstrate that those corrections have been made. Likewise, presenting a video from above does not turn it into an orthoimage.
One courtyard, two useful commissions
Consider an invented briefing for a property team. A new manager wants to recognize the loading entrance and its relationship to the courtyard. A short, labeled walkthrough may answer that question. The acceptable result is understandable orientation, not a dimension taken from the screen.
Example brief: “Show the courtyard and loading entrance clearly enough for a colleague to recognize them. Keep the location labels visible and supply the recording date. No dimensional output is required.”
Later, the team asks for a paved-area quantity. That changes the required evidence, not just the film edit. The responsible survey or GIS professional must determine the suitable product, coverage and accuracy for that task. Keep the walkthrough as context; do not add an area figure to it to satisfy the revised request.
Make the accepted output usable
For a geospatial delivery, agree how the recipient will open it and which existing records it must align with. Keep the source date, coordinate reference, coverage gaps and quality information with the deliverable. The FGDC framework handbook treats metadata about accuracy, completeness and lineage as information that helps users judge whether geographic data meet their needs.
When a request combines orientation and measurement, commission two clearly identified outputs. Let each answer its own question. A compelling film can remain valuable without carrying a map claim it cannot support.
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