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:: CLOSE-RANGE PHOTOGRAMMETRY WITH AMATEUR CAMERA Dimitar Jechev

Document type:: Multivolume work

Structure type:: Chapter

CLOSE-RANGE PHOTOGRAMMETRY WITH AMATEUR CAMERA Dimitar Jechev GIS Sofia Ltd., Bulgaria, BG-1000 Sofia, 5 Serdika Str., e-mail: jechev@gis-sofia.bg Commission V, WG V/4 KEY WORDS: Close-range, Non-metric, Experiment, Digital, Adjustment, Building ABSTRACT: A frontage of a building has been experim geodetic. The photogrammetric survey has been made by means of station. The shortcomings of the amateur hardware, that have been used for the experiment, were c entally surveyed and processed in two basically different methods — photogrammetric and an amateur digital camera, and the geodetic survey - by a total ompensated by application of a specific mathematical model. The results from the two surveys performed have been compared. The RMS in the plane of the picture (the building frontage) has been calculated to be +1 .9 cm and for the Racurs Co. has been used for this experiment. 1. THEORY 1.1. Problems The work with non-metric cameras for photogrammetric purposes is accompanied by the following problems: e Defining the image co-ordinate system (non-metric cameras do not have fiducial marks). e Defining the unknown elements of internal orientation (focal length and image co-ordinates of the principle poin of the photograph). e Maintaining the elements of internal orientation unchanged in time - usually when working with non-metric cameras, the elements of internal orientation get slightly changed after every single exposure. e Defining the distortion of lens - the distortion with amateur cameras often amounts to considerable values and have substantial effect. 1.2. Solving the problems There are three basically different methods for solving the above mentioned problems known: Calibration in advance. Before surveying, in a laboratory (calibration centre) the unknown elements of internal orientation and distortion of lens shall be defined. The advantage of this method is that the calibration takes place at a laboratory and hence better accuracy at defining of unknown quantities is achieved. The problem with their fluctuation in time remains. Calibration during the processing. The unknown elements are defined by means of a special mathematical instrument. A larger number of control points is needed for their defining - at least 5 points, and it is recommendable 8-10 points per model, compared to 3 points per model when using metric camera. Self-calibration. It is based on the mathematical means of the geometry of overlapped areas for defining the unknown elements. The principles involved are similar to the ones, used for relative orientation of stereo-pair with analogue instrument. It is specific for this method that it does not require larger number of control points. 136 depth £6.1 cm. Photogrammetric software PHOTOMOD Lite of 1.3. Mathematical processing In accordance with the co-linearity condition, every object point, its image and the projection centre, should belong to one and same line, called ray. Mathematically this can be represented by means of the following 3 equations: X; X X X, | Y jm yg 4; R Y Y ( | ) 0 f z Z, | where: i=1 2 ..n is the number of measured image points, n (s, y. 0) are image co-ordinates of point 1, NT (t . . Kos Vort ) are the elements of internal orientation, À, is the scale factor, R is the rotation matrix, defining the spatial rotation of the geodetic co- ordinate system in relation to the image co-ordinate system. R is function of the three angles @ , ¢, K, (X, , y ? Z, y (34.3.2, y are projection centre O. are the geodetic co-ordinates of point i, the geodetic co-ordinates of It is not justifiable to render different scale factor for each i point. The scale factor could be eliminated by dividing the first and second equations from the system by the third one: HH (x —A m,,(Y, = Y), + m,(Z, - Z,) P =x —x,+ i T ali eS nl m,, (x, — X.) mar, -Y,)yrmad zz) tt T y m4 (X, — X,}+m, (Y, = Y) +my(Z, -Z,) E REY TNT. m, (X, — X m,, (Y, — Y,)- m, -4 s where: m are the elements of R matrix

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