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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
684
UNITED STATES COAST AND GEODETIC SURVEY.
equal to the distance of the eorresponding two notches G and D. IsTow apply one of the points of the dividers in P; the other should corne in E and F. Transfer the point to P' and check the length P'G and P'J in the same way. If the print satisfies ail these t< sts, it may be used for the iconometric platting; if it does nof, it is returned to the photographer with a request for a better one.
(c) Platting the picture traces.—Every photograph contains at least one, generally several, of the triangulation points platted on the working sheet, and the traces of both the picture plane and principal plane are found and platted on the plan as follows :
The distance, or principal line PS, fig. 59, is made equal to the focal length of the picture, and the image point a of the point A is projected upon the principal line (= a) and upon the horizon line ( = «'). If Si represents the platted position of the caméra station S on the plan, and if &A1 represents the horizontal direction on the plan from S to A, we make Siüi — Sa' (taken from the photograph) and from au as center, with a a (= Pa') as radius, describe a circle to which Sip is drawn tangent, theu Sip = trace of principal plane and the perpendicular to Sip through a, = pai = trace of picture plane.
Instead of making this construction on the “photograph board,” which will be described further on, it can be made on the plan itself, as follows :
On take S\B, fig. 60, equal to the focal length of the print; erect BG perpendicular to /Si^! in B and equal to a a, fig. 59. Join SXG and take S{p equal to the focal length; at^9 erect a perpendicular to SiG and it will represent the trace of the picture plane, while S{G is the trace of the principal plane.
»
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 93,62 %.
La langue de reconnaissance de l'OCR est le Français.
UNITED STATES COAST AND GEODETIC SURVEY.
equal to the distance of the eorresponding two notches G and D. IsTow apply one of the points of the dividers in P; the other should corne in E and F. Transfer the point to P' and check the length P'G and P'J in the same way. If the print satisfies ail these t< sts, it may be used for the iconometric platting; if it does nof, it is returned to the photographer with a request for a better one.
(c) Platting the picture traces.—Every photograph contains at least one, generally several, of the triangulation points platted on the working sheet, and the traces of both the picture plane and principal plane are found and platted on the plan as follows :
The distance, or principal line PS, fig. 59, is made equal to the focal length of the picture, and the image point a of the point A is projected upon the principal line (= a) and upon the horizon line ( = «'). If Si represents the platted position of the caméra station S on the plan, and if &A1 represents the horizontal direction on the plan from S to A, we make Siüi — Sa' (taken from the photograph) and from au as center, with a a (= Pa') as radius, describe a circle to which Sip is drawn tangent, theu Sip = trace of principal plane and the perpendicular to Sip through a, = pai = trace of picture plane.
Instead of making this construction on the “photograph board,” which will be described further on, it can be made on the plan itself, as follows :
On take S\B, fig. 60, equal to the focal length of the print; erect BG perpendicular to /Si^! in B and equal to a a, fig. 59. Join SXG and take S{p equal to the focal length; at^9 erect a perpendicular to SiG and it will represent the trace of the picture plane, while S{G is the trace of the principal plane.
»
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 93,62 %.
La langue de reconnaissance de l'OCR est le Français.