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Short note: Importance and uses of photogrammetry

Short answer

Photogrammetry gives accurate, low-cost maps and measurements, reducing fieldwork and allowing work in hazardous areas. It is used for topographic mapping, engineering site investigation, volume computation, cadastral surveys, and deformation monitoring.

Write a short note on the importance and uses of photogrammetry.

Photogrammetry is the science and art of obtaining reliable measurements and maps of objects and terrain from photographs. Its main branches are aerial photogrammetry (camera in an aircraft) and terrestrial or close-range photogrammetry (camera on or near the ground).

Importance

  • Provides fast, accurate maps of very large areas at a lower cost than ground survey.
  • Gives a permanent, objective record of the ground that can be re-measured at any time.
  • Makes measurement possible in inaccessible, dangerous or restricted places.
  • Produces many outputs from one set of photos: planimetric maps, contour maps, DEMs and orthophotos.
  • Reduces field work, so projects are finished in less time.

Uses

  • Topographic and large-scale engineering mapping.
  • Route and site investigation (roads, railways, canals, dams, transmission lines).
  • Volume computation of earthwork and quarries.
  • Cadastral surveys and land-use planning.
  • Geology, forestry, agriculture and urban planning.
  • Structural deformation, monument and archaeological documentation (close range).
  • Disaster damage assessment and flood mapping.

✓ Answer checked by Claude Opus 5.5 (high effort)

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