際際滷

際際滷Share a Scribd company logo

Presentation

Download as PPTX, PDF
Hayat khan
Hayat khan

This document provides an overview of photogrammetry. It discusses that photogrammetry is a branch of surveying that uses photographs taken from aircraft or the ground to indirectly measure and map objects. The first uses of photogrammetry date back to 1840, but airplanes in the early 1900s greatly advanced the technique. Photogrammetry can be aerial or terrestrial, and has advantages like being cost-effective for large areas and allowing access to dangerous or inaccessible locations. It requires experienced staff and good weather conditions.

1 of 19
Download to read offline
Presented to; Engr. Azmat ali shah Presented by Hayat khan ID; 11664
Presentation
Presentation
Presentation
PHOTOGRAMMETRY It is a branch of surveying in which photographs are taken from an aircraft (or from the ground in some cases) to indirectly measure objects on the ground to produce point coordinates or maps. The term photogrammetry is composed of the words photo and meter meaning measurements from photographs.
Presentation
History The first use of photogrammetry was by Arago, a French geodesist, in 1840. The first aerial photogrammetry was by the French in 1849 using kites and balloons. Laussedat (French) father of photogrammetry.
History Airplanes brought great change to photogrammetry. 1st used in 1913. Aerial photographs were taken in WW1 and WW2 for preparing maps. Due to improvement in computer digital photogrammetry is gaining more and more importance.
Types of photogrammetry Arial. Terrestrial.
Terrestrial photoghraphs Taken with a phototheodolite from the camera stations on the ground. The phototheodolite set at elevated ground.
Presentation
Arial photoghraphs Taken from the camera stations in the air with the axis of camera vertical or nearly vertical. Photographs are overlap from 55 to 65%.
Presentation
Advantages of photogrammetry. cost effected for large areas. photographs takes of dangerous area than to place surveyors in harms way. Photogrammetry provides the ability to map areas inaccessible to field crews. Photogrammetry creates a photographic record of the project site.
Advantages of photogrammetry Very quick and accurate method. It is provide the mean to develop a contour map.
Disadvantages of photogrammetry Required fair and clean weather condition. Very expensive for surveying of small area. High qualified and experienced staff required.
Principle of photogrammetry. Similar to plane table survey. The difference is in plane survey most the work done at field but in photogrammetry most of work is done at office. Suitable for engineering survey for construction of some project when high accuracy is required.
Principle of photogrammetry. Unsuitable for dense forests, flat area with sand due to difficulty to identity point upon the pair of photographs. Suitable for mountainous and hilly area without dense forest.
THANK YOU

More Related Content

Presentation

  • 1. Presented to; Engr. Azmat ali shah Presented by Hayat khan ID; 11664
  • 5. PHOTOGRAMMETRY It is a branch of surveying in which photographs are taken from an aircraft (or from the ground in some cases) to indirectly measure objects on the ground to produce point coordinates or maps. The term photogrammetry is composed of the words photo and meter meaning measurements from photographs.
  • 7. History The first use of photogrammetry was by Arago, a French geodesist, in 1840. The first aerial photogrammetry was by the French in 1849 using kites and balloons. Laussedat (French) father of photogrammetry.
  • 8. History Airplanes brought great change to photogrammetry. 1st used in 1913. Aerial photographs were taken in WW1 and WW2 for preparing maps. Due to improvement in computer digital photogrammetry is gaining more and more importance.
  • 10. Terrestrial photoghraphs Taken with a phototheodolite from the camera stations on the ground. The phototheodolite set at elevated ground.
  • 12. Arial photoghraphs Taken from the camera stations in the air with the axis of camera vertical or nearly vertical. Photographs are overlap from 55 to 65%.
  • 14. Advantages of photogrammetry. cost effected for large areas. photographs takes of dangerous area than to place surveyors in harms way. Photogrammetry provides the ability to map areas inaccessible to field crews. Photogrammetry creates a photographic record of the project site.
  • 15. Advantages of photogrammetry Very quick and accurate method. It is provide the mean to develop a contour map.
  • 16. Disadvantages of photogrammetry Required fair and clean weather condition. Very expensive for surveying of small area. High qualified and experienced staff required.
  • 17. Principle of photogrammetry. Similar to plane table survey. The difference is in plane survey most the work done at field but in photogrammetry most of work is done at office. Suitable for engineering survey for construction of some project when high accuracy is required.
  • 18. Principle of photogrammetry. Unsuitable for dense forests, flat area with sand due to difficulty to identity point upon the pair of photographs. Suitable for mountainous and hilly area without dense forest.