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- TABLE DES MATIÈRES
- RECHERCHE DANS LE DOCUMENT
- TEXTE OCÉRISÉ
- Première image
- PAGE DE TITRE
- CONTENTS (p.621)
- CHAPTER I - FUNDAMENTAL PRINCIPLES OF ICONOMETRY (p.630)
- I. Orienting the picture traces on the working sheet (p.631)
- II. Arithmetical determination of the principal and horizon lines (p.633)
- III. Graphic method for dertermining the positions of the principal and horizon lines on the perspective (p.635)
- IV. The five-point problem (by Prof. F. Steiner). Locating the position of the camera station by means of the perspective when five triangulation points are pictured on one photograph (p.636)
- 1. Determination of the principal point and of the distance line (p.637)
- 2. Simplified construction for locating the camera station by means of the five-point problem (p.637)
- 3. Application of the five-point problem for the special case when the five points are ranged into a triangle (p.638)
- 4. To find the elevation of a camera station that had been located by means of the five-point problem (p.638)
- V. The three-point problem (p.639)
- VI. Orientation of the picture traces, based upon instrumental measurements made in the field (p.641)
- VII. Relations between two perspectives of the same object viewed from different stations ; Prof. G. Hauck's method (p.641)
- VIII. To plat a figure, situated in a horizontal plane, on the ground plan by means of its perspective (p.645)
- IX. To draw a plane figure on the ground plan by means of the "method of squares" if its perspective and the elements of the vertical picture plane are given (p.649)
- X. The use of the "vanishing scale" (p.651)
- CHAPTER II - PHOTOGRAPHS ON INCLINED PLANES (p.653)
- CHAPTER III - PHOTOTOPOGRAPHIC METHODS (p.659)
- I. Analytical or arithmetical iconometric methods (p.659)
- 1. Method of Prof. W. Jordan (p.659)
- 2. Method of Dr. G. Le Bon (p.660)
- 3. Method of L. P. Paganini (Italian method) (p.661)
- General determination of the elements of the Italian photographic perspectives (p.662)
- (a) Orientation of the picture trace (p.662)
- (b) Platting of the lines of direction to pictured points of the terrene (p.662)
- (c) Determination of the elevations of pictured points (p.663)
- (d) Checking the position of the horizon line on a photograph (p.664)
- (e) Determination of the focal length (p.665)
- (f) Determination of the principal point of the perspective (p.665)
- (g) Application of Franz Hafferl's method for finding the focal length of a photographic perspective from the abscissæ of two pictured known points (p.668)
- 4. General arithmetical method for finding the platted positions of points pictured on vertically exposed photographic plates (negatives) (p.668)
- 5. General arithmetical method for finding the platted positions of points pictured on inclined photographic plates (p.671)
- 6. General arithmetical determination of the elements of photographic perspectives (p.672)
- II. Graphical iconometric methods (p.674)
- 1. Method of Col. A. Laussedat (p.674)
- (a) Locating points, identified on several photographs, on the platting sheet (p.676)
- (b) Determination of the elevations of pictured points (p.676)
- (c) Drawing the plan, including horizontal contours (p.677)
- 2. Method of Dr A. Meydenbaur (p.677)
- (a) Determination of the focal length for the panorama views (p.678)
- (b) General method of iconometric platting (p.678)
- (c) Determination of the elevations of pictured points of the terrene (p.681)
- 3. Method of Capt. E. Deville (Canadian method) (p.681)
- (a) General remarks on the field work (p.681)
- (b) General remarks on the iconometric platting of the survey (p.683)
- (c) Platting the picture traces (p.684)
- (d) The identification of points, pictured on several photographs, representing the same points of the terrene (p.685)
- (e) Application of Professor Hauck's method for the identification of points on two photographs (p.685)
- (f) Platting the intersections of horizontal directions to pictured points (p.686)
- (g) Platting pictured points iconometrically by "vertical intersections" (p.687)
- (h) Iconometric determination of elevations (p.689)
- (i) Iconometric determination of elevations by means of the "scale of heights" (p.690)
- (j) The use of the so-called "photograph board" (p.691)
- (k) Constructing the traces of a figure's plane (p.692)
- (l) Contouring (p.694)
- (m) The photograph protractor (p.696)
- 4. Method of V. Legros for determining the position of the horizon line (p.697)
- 5. Method of Prof. S. Finsterwalder for the iconometric location of horizontal contours (p.697)
- I. Analytical or arithmetical iconometric methods (p.659)
- CHAPTER IV - PHOTOGRAMMETERS (p.699)
- I. Requirements to be fulfilled by a topographic surveying camera (p.699)
- II. Ordinary cameras (with bellows) made adapted for surveying (p.699)
- III. Special surveying cameras with constant focal lengths (p.701)
- IV. Surveying cameras combined with geodetic instruments (phototheodolites, photographic plane tables, etc.) (p.706)
- 1. The new Italian phototheodolite, devised by L. P. Paganini (p.708)
- 2. The photogrammetric theodolite of Prof. S. Finsterwalder (p.711)
- 3. Phototheodolite for precise work, by O. Ney (p.712)
- 4. The phototheodolite of Dr. C. Koppe (p.715)
- 5. Phototheodolite devised by V. Pollack (p.716)
- 6. Col. A. Laussedat's new phototheodolite (p.717)
- 7. The phototheodolite of Starke and Kammerer (p.717)
- 8. Captain Hübl's plane table photogrammeter (p.721)
- V. Panoramic cameras (p.722)
- CHAPTER V - ICONOMETERS AND PERSPECTOGRAPHS (p.725)
- Dernière image
634
UNITED STATES COAST AND GEODETIC SURVEY.
Whenever the positions of thé points A, B, C, . . . . with reference to tke station S are not known, it will become necessary to observe the horizontal angles A SB, BSG, CSB, .... instrumentai^ from the station S, and plat the same upon a sheet of paper in order to adjust the paper strip upon the radiais, in the manner just described, to find the principal point and distance line (focal length).
(2) Détermination of the position of the horizon line on the perspective.—When the élévations AA',BB',CC', .... of the points A, B, C, .... above the horizon of the station ($) are known, the position of the horizon line (oo') (fig. 8) may be found by constructing or by computing the lengths of the ordinates aa', W, ce', .... from the relations:
aa1 : AA' = Sa' : SA'
W : BB' = Sb' : SB' ceCC' = Se': SC'
whence
aa' = W =
Sa'. A A' SA'
Sb'.BB' ~ SB'
= y>
=y', etc.
A
— -i-----------f —
The distances Sa', Sh', Se', . . . are taken from the platting sheet (fig. 8) and the distances
SA', SB', SC',............as well as the différences in élévation AA', BB', CC',..............'
are known (if the points A, B, C, . . . had been located in the horizontal and vertical sense with reference to the station S).
For example :
Différence in élévation between A and A' = 100m.
Distance of A' from the station S = 1000™.
Distance Sa', measured on the platting sheet, = 0*5m.
The ordinate aa' = 9 ^ qqq ^ =
The horizon line {oo') on the négative will be 50 mm. vertically below (parallel with VY) the pictured point a. ,
The direction of FF (the principal line) being parallel to the pictured plumb line, this distance aa' is laid off in the same direction below a, and a line oo', drawn at right angles to FF through a', will locate the horizon line. The ordinates W, ce', . ... oî the other pictured points may
Le texte affiché peut comporter un certain nombre d'erreurs. En effet, le mode texte de ce document a été généré de façon automatique par un programme de reconnaissance optique de caractères (OCR). Le taux de reconnaissance estimé pour cette page est de 94,49 %.
La langue de reconnaissance de l'OCR est le Français.
UNITED STATES COAST AND GEODETIC SURVEY.
Whenever the positions of thé points A, B, C, . . . . with reference to tke station S are not known, it will become necessary to observe the horizontal angles A SB, BSG, CSB, .... instrumentai^ from the station S, and plat the same upon a sheet of paper in order to adjust the paper strip upon the radiais, in the manner just described, to find the principal point and distance line (focal length).
(2) Détermination of the position of the horizon line on the perspective.—When the élévations AA',BB',CC', .... of the points A, B, C, .... above the horizon of the station ($) are known, the position of the horizon line (oo') (fig. 8) may be found by constructing or by computing the lengths of the ordinates aa', W, ce', .... from the relations:
aa1 : AA' = Sa' : SA'
W : BB' = Sb' : SB' ceCC' = Se': SC'
whence
aa' = W =
Sa'. A A' SA'
Sb'.BB' ~ SB'
= y>
=y', etc.
A
— -i-----------f —
The distances Sa', Sh', Se', . . . are taken from the platting sheet (fig. 8) and the distances
SA', SB', SC',............as well as the différences in élévation AA', BB', CC',..............'
are known (if the points A, B, C, . . . had been located in the horizontal and vertical sense with reference to the station S).
For example :
Différence in élévation between A and A' = 100m.
Distance of A' from the station S = 1000™.
Distance Sa', measured on the platting sheet, = 0*5m.
The ordinate aa' = 9 ^ qqq ^ =
The horizon line {oo') on the négative will be 50 mm. vertically below (parallel with VY) the pictured point a. ,
The direction of FF (the principal line) being parallel to the pictured plumb line, this distance aa' is laid off in the same direction below a, and a line oo', drawn at right angles to FF through a', will locate the horizon line. The ordinates W, ce', . ... oî the other pictured points may
Le texte affiché peut comporter un certain nombre d'erreurs. En effet, le mode texte de ce document a été généré de façon automatique par un programme de reconnaissance optique de caractères (OCR). Le taux de reconnaissance estimé pour cette page est de 94,49 %.
La langue de reconnaissance de l'OCR est le Français.