SU301A1 - The device for correcting images of the terrain - Google Patents

Description

The proposed device is intended to correct aerophotographic images of the terrain, retreating from the orthoscopic projection, not only due to the incorrect position of the camera axis, but also due to the terrain relief and objects, the projections of which more deviate to the side of the lens on the earth's surface. . At the direction of the author, the correction for the distortion due to the deviation of the optical axis and the relief was made by calculating using the formula, while the device proposed by him allows automatic correction of aerial images taken in the aerotopographic projection.

FIG. 1 shows the proposed device in vertical projection; FIG. 2- geometrical scheme of the same device; in fig. Figures 3 and 4 give an example of designing a straight cone on the surface of the earth in the form of a cartographic projection (by dashed lines, Fig. 4), and in the form of an aero topographic projection (solid lines, Fig. 4).

The author's theory of construction is confirmed by the following example: suppose that the lens of a removable device is at point O, fig. 3, at a height of 500 meters above the straight cone. The cross section of the cone by horizontal planes with elevations of 100, 200, 300, and 400 meters and projecting these sections in a map projection, we obtain a series of concentric circles (Fig. 4, dotted lines); when designing from point O (dashed line, fig. 3) on the photogram, the centers of the sections are shifted, and the radii of the projections of the sections are increased, as shown in FIG. 4 solid lines. Let 15 m. And the lateral projection of the cone, fig. 3, to scale

0.153

40,000

2000

Take an arbitrary point A on one of the sections of the cone, FIG. 3, its map projection will be A, fig. 4, and the aero topographic projection will be point A, FIG. four; The radius vector of this point will be + / 7 ,, because all values lying in the horizontal plane of 300 are increased in the ratio .. and therefore J J - J J J are increased and the coordinates of point A-. From the diagram, FIG. 2, it can be seen that a horizontal ruler L is attached to the axis O, installed above the pole P and with any tilt-ruler L. On the ruler N, a holder M with an oblique plane Q, a needle S and a pencil T slides. Plane O and ruler L are the guides for the head U and the pencil T. Let us call the distance between S and 7 through D, the constant angle between the ruler L and the bevel of the plane Q through | 3 :: 45 °, and the variable angle between NL through a, then 1 p tang, 3 cotang a (. vector) but d should be equal to D, hence Cotg "- (f-1 Cotg from here: W7 + d I) 7.5-- | -3- 1.43 centime, and / - 1 / 7.5 + 3- a this is the radius vector t hibernation AI, ie. e. orthogonal projection taken of the point A. Ved needle S of the circle of Sant. aerophotographic horizontal, a pencil T will draw a new circle, identical with the cartographic horizontal. The proposed device, FIG. 1, consists of an O axis with a pin O, with which the device is precisely mounted on the projection of the lens in a photographic image. A horizontal ruler 1 is mounted on the axis of the RO, rotating in a horizontal plane. On the ruler, the collar 11 is loosely worn with a needle 2 installed on the correct point of the photo; The micrometer screw -7 serves to be installed at an elevation determined by the stereo equipment from the corresponding pair of stereograms f of the same terrain. When pressure is applied to button 4, the inclined bar 6 moves down until the micrometer screw stops against the inclined ruler .9, which is installed with a micrometer 5. When needle 2 trades along the contours of the aero photographic image, the bar 6 slides in the groove of the clamp 11, depending on the installation of the ruler, 9 and screw o, pencil 8 will give, with a shift, a corrected contour proportional to the distance from one side, from pin 2 to axis O, and on the other hand to installation of micrometer 3. Nut 7 micrometer 3 is arranged movable to match the divisions of head 10 micro Etra 3 deletions paralakticheskogo screw head stereocomparator. SUBJECT OF INVENTION. A device for correcting images of the terrain, characterized by the use of a divided ruler sitting on the axis O, which ruler carries an inclined ruler, 9, a nut 7 with a micrometer, equipped with a head If), a screw abutting the ruler 9 and defining its slope and a collar with a pointer 2, provided with an inclined slot serving to move in it an inclined bar b with button 4, a stop screw 5 and a pencil S.

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