JP3056279U - Photo reference point - Google Patents

Abstract

(57) [Summary] [PROBLEMS] The present invention makes it possible to make a measurement point and an index coincide with each other by setting up a photograph reference point used for photogrammetry. The present invention provides a photograph reference point (commonly known as a pointer).
When the erection is made on the ground surface, the vertex on the hinge side in contact with the erected ground surface is used as a measurement point, that is, a reference point, and the measurement point and the index can be matched.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a photographic reference point used for photogrammetry.

[0002]

[Prior art]

 When conducting traffic accident surveys or photogrammetry, a square pyramid or cone photo control point was placed at the measurement point on the ground surface, and the vertex was used as an index.

[0003]

[Problems to be solved by the invention]

 If a conventional square pyramid or cone photographic reference point is placed at the measurement point on the ground surface, the measurement point will be hidden at the bottom of the square pyramid or cone, making it difficult to place it accurately. Also, because of the height, it is difficult to find the correct three-dimensional coordinates. Therefore, the measurement point and the index can be made coincident by making a vertical shape, and an error between the measurement point and the index due to the shape is to be minimized.

[0004]

[Means for Solving the Problems]

 In the present invention, when the photo reference point (commonly known as a pointer) is set upright, the vertex on the hinge side in contact with the ground surface is set as the measurement point, that is, the photo reference point, when standing on the ground surface. This solves the problem.

[0005]

[Embodiment of the invention]

 The two plates are hinged to open and stand on the ground. Attach a belt to the inside of the two plates and tie them together and open them at a stable angle (about 90 °). In addition, a plate-shaped weight that improves stability when standing up and that does not hinder folding is attached below the inside. On the outside, an inverted triangle with the vertex at the hinge side in contact with the ground surface is printed to clearly indicate the reference point.

[0006]

An embodiment will be described below with reference to the accompanying drawings. 1 is a plate-shaped core made of cardboard, plywood or hard plastic, 2 is a jacket made of a soft material that covers two plate-shaped cores and has a hinge function, and 3 is a belt. Weld or adhere to the inner skin of the board to regulate the opening angle. Numeral 4 is a metal plate-shaped weight, which improves stability when placed on the ground surface.

[0007] The color of the outer skin is black, and an inverted triangle having the vertex at the corner on the hinge side in contact with the outer ground surface is printed in white to clarify light and shade, thereby facilitating subsequent analysis.

[0008]

[Effect of the invention]

 As described above, the photographic reference point of the present invention can be accurately placed at the measurement point on the ground surface, so that the accuracy of photogrammetry can be improved, as well as stability due to the weight and good folding. It is simply plate-shaped and very convenient for storage and transportation.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a photographic reference point of the present invention.

FIG. 2 is a view taken along the arrow X of a reference point of the photograph.

FIG. 3 is a sectional view taken along line AA of the reference point of the photograph.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plate-shaped core 2 Outer skin 3 Opening restriction belt 4 Weight 5 Reference point (measurement point) 6 White printing part 7 Hinge part 8 Belt bonding part

Claims (1)

[Utility model registration claims] 1. The two plates are hinged, and when used, about 9
A photographic reference point characterized in that the vertices on the hinge side in contact with the ground surface are used as a photographic reference point when used by standing up on the ground surface by opening it up by 0 °.