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12 Cards in this Set

  • Front
  • Back

Aerial Triangultion

process of piecing together overlapping aerial images so to make a map

determine position of each image in a mapping frame with ground control points

Auto Correlation

mathematically computing common features found in 2 or more pictures captured from different perspectives

How does Auto Correlation work

Interest points

with 2 overlapping photos, identify points based on invariability in translation, rotation, scale,

reduce points mathemetically to the ones with the least variability


Rectified or Straightened

What are the required inputs for Orthophotos?

- Digital Air photo

- DEM (maybe DSM if making a True Ortho)

- Output scale (pixel size)

How are displacements and distortions dealt with in orthophotos?

- Camera Calibration (earth curvature, atmospheric refraction)

- Photogrammetric orientations (tilt/tip)

- Orthorectification (terrain/radial distortions)

Which resampling prodecures produce an orthophoto from an air photo?

Geometric resampling

Spectral resampling

Production problems of the image quality of ortho rectification

colour matching/balancing

radiometric correction


pixel size (too coarse)

Production problems of the positional accuracy of ortho rectification

quality of external orientations

ground control points

DEM and mosaicking procedure

Standard Orthos



Corrects ground elevations (fields, mtns, forests)

True Orthos


Corrects elevated features (buildings, trees)

What is the purpose of an orthophoto?

gives visual details of an air photo and the usefulness of a map

Photo Maps