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Record an Aerial Photo's Sortie and Frame Before Comparing a Family Site

By ImgHeal · Updated

An aerial image needs its collection and frame identity as well as a place name. Record the sortie, frame, and date information provided by the archive before comparing a family site. A map footprint may cover the area without showing the detail you need.

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Locate coverage and inspect the actual frame

Start with a supported site location and a period relevant to your question. Use the aerial archive's coverage tools or finding assistance to identify candidate photographs. NCAP explains the importance of collection, sortie, and frame references, while Historic England offers access to its own aerial holdings. Record which archive supplies the image. A coverage outline, an index map, and a viewable photograph are different resources; inspect the frame rather than assuming its footprint guarantees a useful view of the building.

Keep orientation and sequence information

Save the frame identifier, date as supplied, and any orientation or flight information that affects interpretation. Compare adjacent frames when access permits, because a site near an edge may be clearer elsewhere. Distinguish a vertical view from an oblique one and avoid comparing building shapes without accounting for viewpoint. Keep an adequately wide research copy with recognizable surroundings. If the date is uncertain or supplied at collection level, preserve that qualification instead of assigning it to the exact exposure.

Write a location comparison another person can repeat

Record the features that connect the frame to the family site: road junctions, watercourses, building arrangement, or other stable landmarks. Note changes and alternative locations. A successful aerial match can describe the site at the recorded period without identifying people in a ground-level photograph. Retain the original aerial citation and family scan together, with a separate annotated comparison. A restored roofline or field boundary remains edited interpretation and should not be used as the sole basis for establishing the site's historical appearance.

Keep the evidence trail usable

  • Keep collection, sortie, frame, and supplied date.
  • Inspect the photograph rather than only its footprint.
  • Record orientation and neighboring-frame comparisons.

Sources and further reading

Questions about this restoration task

Is a sortie reference enough to identify one photograph?

Usually a frame identifier is also needed. Follow the archive's reference structure so someone else can retrieve the exact image.

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