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Geography 12: Maps and Spatial Reasoning Lecture 22: Photogrammetry and air photos for mapping

Geography 12: Maps and Spatial Reasoning Lecture 22: Photogrammetry and air photos for mapping. Professor Keith Clarke. Some Definitions. Photography: The art or process of producing images on a sensitized surface by the action of light or other radiant energy

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Geography 12: Maps and Spatial Reasoning Lecture 22: Photogrammetry and air photos for mapping

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  1. Geography 12: Maps and Spatial Reasoning Lecture 22: Photogrammetry and air photos for mapping Professor Keith Clarke

  2. Some Definitions • Photography: The art or process of producing images on a sensitized surface by the action of light or other radiant energy • Image: A reproduction or imitation of the form of a view of objects • Photo interpretation: The act of examining aerial photographs/images for the purpose of identifying objects and judging their significance • Photogrammetry: The science or art of obtaining reliable measurements by means of photography

  3. 1858 - Gasper Felix Tournachon "Nadar" takes the first aerial photograph from a captive balloon from an altitude of 1,200 feet over Paris 1858 Photography takes to the air

  4. 1887 - Germans began experiments with aerial photographs and photogrammetric techniques for measuring features and areas in forests 1889 - Arthur Batut take the first aerial photograph from using a kite of Labruguiere France Origins of Photogrammetry

  5. U-2 & Francis Gary Powers

  6. CORONA

  7. Principal Point

  8. Radial displacement around nadir

  9. Relief Displacement

  10. Height from displacement

  11. Reference axes

  12. Orthorectification

  13. Orthorectified

  14. Buildings easy, terrain hard!

  15. Unless, there are two images

  16. Stereo geometry (Conjugate PP)

  17. Flight line geometry/overlap

  18. Height from parallax

  19. Flight planning map

  20. NHAP 1:80K (Wisconsin)

  21. Photo Interpretation Tasks • Detection and identification of features, phenomena, or processes • Detection and interpretation • Labeling • Confidence assessment • Measurement and estimation • Use in topographic and special purpose mapping • Map update • Problem solving • Object complexes • Object relations • Assessments/causes • Rating of evidence • Assembly of information • Ranking and assessment

  22. Detection

  23. Identification: What is it? Sitka, Alaska Source: www.mehs.educ.state.ak.us/ sitka/cross_sound.html

  24. Process

  25. Process: Inference

  26. Inference: Sequence

  27. Change detection Bam City Japan. Digital Globe imagery Sept 03 and Jan 04 (Source: Tokyo Tech)

  28. Measurement

  29. Orientation

  30. Spatial Resolution 10cm, 25cm, 50cm, 1m

  31. Resolution * See mecca_saudi_arabia_quickbird_feb11_2003.tif

  32. Shape

  33. Texture

  34. Pattern

  35. Oblique Low Angle(no apparent horizon visible)

  36. Oblique Low Angle(cont.)

  37. Oblique Low Angle(cont.)

  38. Overhead Vertical True

  39. Oblique: High Angle CIR (apparent horizon visible)

  40. Oblique: High angle (apparent horizon visible) Examples of High Oblique Photographs Mozambique Flooding, March 2000

  41. Multi-lens mapping camera

  42. UCSB Campus Orthophotography

  43. Chem Building: Nadir?

  44. Control Point

  45. Motion blur

  46. Storke Tower

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