Proceedings, XXth congress: Proceedings, XXth congress

Altan, M. Orhan

Bibliographic data

Multivolume work

Persistent identifier:: 1663674213

Title:: Proceedings, XXth congress

Sub title:: Istanbul, 12 - 23 July 2004

Year of publication:: 2004

Place of publication:: Istanbul

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 1663674213

Language:: English

Additional Notes:: Erscheinungsdatum des Originals ist aus dem Copyrightjahr ermittelt.; Auch bezeichnet als XXth International Congress for Photogrammetry and Remote Sensing

Editor:: Altan, M. Orhan

Corporations:: International Society for Photogrammetry and Remote Sensing, Congress, 20., 2004, Istanbul; International Society for Photogrammetry and Remote Sensing, Commission Primary Data Acquisition

Adapter:: International Society for Photogrammetry and Remote Sensing, Congress, 20., 2004, Istanbul; International Society for Photogrammetry and Remote Sensing, Commission Primary Data Acquisition

Founder of work:: International Society for Photogrammetry and Remote Sensing, Congress, 20., 2004, Istanbul; International Society for Photogrammetry and Remote Sensing, Commission Primary Data Acquisition

Other corporate:: International Society for Photogrammetry and Remote Sensing, Congress, 20., 2004, Istanbul; International Society for Photogrammetry and Remote Sensing, Commission Primary Data Acquisition

Document type:: Multivolume work

Volume

Persistent identifier:: 166368779X

Title:: Proceedings, XXth congress

Scope:: IV, 226 Seiten

Year of publication:: 2004

Place of publication:: Istanbul

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 166368779X

Illustration:: Illustrationen, Diagramme

Signature of the source:: ZS 312(35,B8)

Language:: English

Additional Notes:: Erscheinungsdatum des Originals ist aus dem Copyrightjahr ermittelt.

Usage licence:: Attribution 4.0 International (CC BY 4.0)

Editor:: Altan, M. Orhan

Corporations:: International Society for Photogrammetry and Remote Sensing, Congress, 20., 2004, Istanbul; International Society for Photogrammetry and Remote Sensing

Adapter:: International Society for Photogrammetry and Remote Sensing, Congress, 20., 2004, Istanbul; International Society for Photogrammetry and Remote Sensing

Founder of work:: International Society for Photogrammetry and Remote Sensing, Congress, 20., 2004, Istanbul; International Society for Photogrammetry and Remote Sensing

Other corporate:: International Society for Photogrammetry and Remote Sensing, Congress, 20., 2004, Istanbul; International Society for Photogrammetry and Remote Sensing

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2019

Document type:: Volume

Collection:: Earth sciences

Chapter

Title:: MULTI-TRIANGULATION TO GET GCP FOR OLD UNPREMARKED AERIAL PHOTOGRAPHS Fahmi Amhar

Document type:: Multivolume work

Structure type:: Chapter

International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B-YF. Istanbul 2004 Some errors in rolls, runs, photos and counters number are detected. The approximated photo centre coordinates (APCC) was made by hand. At time of photography, no aerial camera was equipped with GPS or INS. In the fact, this APCC could be wrong for some miles (fig. 1). . jaztipae Fig.1. Overview of the project location a square is map sheet 1:50.000 (15' x 15) From the pre-selected photos, a paper copy will be made. The paper copy will be then layout to get the optimal combination between photogrammetry quality and minimum cost. The Potential GCP placement will be done simultaneously on the layout, and thereafter the layout will be snapshot to have good documentation. 1.3 The Selection of Potential GCP A big problem for this project is the fact that: (1) there a large number of aerial photos; (2) the photos are heterogeneous; (3) the photos are older than 5 years; (4) there is no premarked ground control on photos; (5) there is no kinematics-GPS on board of photo-position for aerial triangulation. In addition, the post GCP-survey would be very hard. The problem is focused also to identify the place on photographs to the current situation and to get the place. The problem to make post-GCP for successive aerial triangulation is to identify the suitable points. These natural GCP should fulfil at least 4 requirement: (1) the point must be good geometrically distributed, (2) the point must be clear identifiable on photographs, (3) the point could be found again now — although gap of more than 10 years, (4) the point must be accessible — partially using helicopter. Points (1) and (2) will be decided by photogrammetrist on the office. Point (3) will be decided by photogrammetry-surveyor on field. In case of survey by helicopter, point (4) will be decided by pilots. For one full sheet (ca. 160 photos) at least nine GCP must be found and some others must be selected as reserves. In the reality, this job is often very difficult due to the low quality of the photos or the fact of the objects (just jungle without texture, or texture but without access possibility (fig.3). e A X S Fig. 2. Lay outing of Photo and Planning GCP location 1.4 GCP Survey using Helicopter For GCP survey using helicopter, a good plan must be established. Due to the difficult area, some logistic base camps and fuel points must be selected. Base camp is normally place where there is minimal a house which could be used for several day for crew. Important is water. Food should be brought by our self. Electricity must be also generated by own generator. Fuel to the fuel point must be transported by boats or land vehicle. This fuel point must be place where helicopter can land, although it is not a helipad. During the survey, all necessary equipment must be taken to the field, including some laptop computers, also CD writer for backup, printer, GPS navigator, digital camera, etc. For communication, satellite hand phone will be used. Unfortunately, the data channel is not yet established, so data store to the office could not be done. Consequently, a special procedure is applied to guarantee that in all data is saved. Data is copied to two laptops, USB-Hard disk, and some CD. Regularly, the CD is sent by snail-mail to the office if post office is found. The whole campaign is about 60 days, and we don't know what happened during these days. To avoid data loss if accident is occurred, during moving, laptops, USB-HD and CD bearer should not be in same helicopter. The campaign will be carried out by three helicopters. Helicopter operation is rather expensive, but in almost points in the jungle of Kalimantan, it is the only way to get the points. The more serious problem is to identify the point, since the photographs is made about 10 years ago. In Kalimantan jungle, the most accurate point for ground controls is manmade objects like bridge or county-office house. Once it is created, a renovation is rather seldom. The second accurate point is Mouth River to another river. However, sedimentation or crosion could change this landscape. The third and last alternative is logging road or logging airstrips. Some of them are changed, leaved already or many new are created, so identifying is very difficult.

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