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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
REPORT FOR 1897-PART II. APPENDIX NO. 10.
635
well serve to eheck this position of oo'. The horizon line will be the tangent to the arcs described with aa', bb', cc', . . . . about a, b, c, . . . . respectively, as centers.
The principal point P, may now be transferred to the négative by using the paper strip, and the line drawn through P perpendicular to oo' will be the principal line for the picture MN.
III. GRAPHIC METHOD FOR DETERMINENTGr THE POSITIONS OF THE PRINCIPAL AND HORIZON
LINES ON THE PERSPECTIVES.
The following graphie method for orienting the picture trace and locating the principal and the horizon lines was published by Prof. F. Schiffner in 1887 ; it is also mentioned by Prof. F. Steiner.
Three points, A, B, and G (iig. 9), may be given with reference to the station S npon the platting sheet.
B
Fig.9
From 8 radiais are drawn through A, B, and (7. Through a point a on the ray 8A a parallel to SC is drawn, and the distance a'b' (taken from the négative MN) is laid off from a (= ab\) upon this parallel, while the distance b'c' is laid off upon the same line from b\ (= b'ic'i). Parallels to the radial SA are now drawn through the points and c\ and prolonged to intersect the radiais SB and S O. The line {h'W) connecting these two points of intersection will be parallel with the direction of the picture trace.
The same distances a'b' and b'c' (tajien from the négative) are laid off upon this line h'W from a2(— a2b2) and from b2 (=b2c2). The lines drawn through these points b2 and Cj, and parallel with the radial SA, are brought to intersections with the radiais SB and SG, when the line (hh) passing through these intersections will represent the picture trace correctly placed (oriented) with reference to S, A, B, and C.
The distance SP of 8 from hh represents the distance line (focal length) of the picture MN, while the point P‘ will be the horizontal projection of the principal point P.
After having transferred P' (with reference to a', b', and &), by means of a paper strip, to the négative MN, a parallel to VV, drawn through the transferred point P, will locate the principal line upon the négative.
The horizon line may now be located in the same manner as shown under II, 2, adopting the graphie solution.
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 95,30 %.
La langue de reconnaissance de l'OCR est le Français.
635
well serve to eheck this position of oo'. The horizon line will be the tangent to the arcs described with aa', bb', cc', . . . . about a, b, c, . . . . respectively, as centers.
The principal point P, may now be transferred to the négative by using the paper strip, and the line drawn through P perpendicular to oo' will be the principal line for the picture MN.
III. GRAPHIC METHOD FOR DETERMINENTGr THE POSITIONS OF THE PRINCIPAL AND HORIZON
LINES ON THE PERSPECTIVES.
The following graphie method for orienting the picture trace and locating the principal and the horizon lines was published by Prof. F. Schiffner in 1887 ; it is also mentioned by Prof. F. Steiner.
Three points, A, B, and G (iig. 9), may be given with reference to the station S npon the platting sheet.
B
Fig.9
From 8 radiais are drawn through A, B, and (7. Through a point a on the ray 8A a parallel to SC is drawn, and the distance a'b' (taken from the négative MN) is laid off from a (= ab\) upon this parallel, while the distance b'c' is laid off upon the same line from b\ (= b'ic'i). Parallels to the radial SA are now drawn through the points and c\ and prolonged to intersect the radiais SB and S O. The line {h'W) connecting these two points of intersection will be parallel with the direction of the picture trace.
The same distances a'b' and b'c' (tajien from the négative) are laid off upon this line h'W from a2(— a2b2) and from b2 (=b2c2). The lines drawn through these points b2 and Cj, and parallel with the radial SA, are brought to intersections with the radiais SB and SG, when the line (hh) passing through these intersections will represent the picture trace correctly placed (oriented) with reference to S, A, B, and C.
The distance SP of 8 from hh represents the distance line (focal length) of the picture MN, while the point P‘ will be the horizontal projection of the principal point P.
After having transferred P' (with reference to a', b', and &), by means of a paper strip, to the négative MN, a parallel to VV, drawn through the transferred point P, will locate the principal line upon the négative.
The horizon line may now be located in the same manner as shown under II, 2, adopting the graphie solution.
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 95,30 %.
La langue de reconnaissance de l'OCR est le Français.