JP3678866B2 - Ground control equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ground control point device disposed at a construction site in order to facilitate three-dimensional measurement by a photogrammetric method of a construction object.
[0002]
[Prior art]
The three-dimensional measurement by the photogrammetry method is to shoot the object to be measured such as the terrain at the construction site from two different points in the ground space (stereo shooting), and to measure the object based on the two photographed images. The three-dimensional coordinates of the object are calculated, and the three-dimensional shape information and the three-dimensional model of the object to be measured are created. At this time, the construction site where the photograph is taken includes a plurality of reference points with known ground coordinates and a plurality of points (pass points) that are photographed in common with two images (referred to as measurement models) that are photographed in stereo. A control point device indicating a fixed point is installed in advance.
As shown in FIG. 7 (b), the conventional orientation point device has a pattern in which one plate is divided into four and white and black areas are adjacent to each other as shown in FIG. 7 (a). A square pyramid was used. The plate-shaped control point device is used especially when taking aerial photographs of the construction site or when taking a picture from a position overlooking the construction site such as a crane. It is installed in a flat place.
[0003]
[Problems to be solved by the invention]
However, the conventional control point device has a drawback that it is difficult to install when it is installed on an uneven surface such as a slope, and even if it is installed, it is difficult to see depending on the photographing position. Further, when specifying the ground control point device on the photographed image, it must be determined only by its shape, and the ground control point device disposed far from the photographing position can be easily identified. was difficult.
[0004]
The present invention has been made to solve the above-described problems, and provides a ground control device that can be easily set on a slope of a construction site and the like, and a photographed ground control point can be easily specified on an image. For the purpose.
[0005]
[Means for Solving the Problems]
A ground control point device according to claim 1 of the present invention is provided at a point of intersection of a reference mark and a plurality of reference marks provided in a plurality of directions facing a plurality of photographing directions by an imaging device and a support body located on a photographic subject a target having an installed high luminance portion, the target body, characterized in that a mounting portion for mounting to the support.
[0006]
According to a second aspect of the present invention, the high brightness portion includes a reflector or a light emitter.
[0007]
The ground control device according to claim 3 of the present invention is characterized in that the support body is composed of a rod body whose bottom end is sharp and can be inserted into the terrain, or an installation base that can be installed on a flat ground.
In addition, the said installation stand consists of weights, such as a hemisphere or a square weight, which has the shape which can be installed stably on a flat ground.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an orientation point device 1 according to the present invention, which includes a high-luminance portion 3 made of a reflective seal at the center of both sides of a disc-shaped target body 2, and the target body 2 is sharp. The rod-shaped support body 4 having a lower end 4a having a shape is attached to a target body mounting portion 4b provided at the upper end with a screw or the like. The high-intensity part is disposed at the center of a cross-shaped reference mark 5 that extends in the vertical direction and is provided in advance on the disc-shaped target body 2.
FIG. 2 shows an orientation point device 6 for installation on a flat place on the construction site. The disk-shaped target body 2 is mounted on a square spindle-shaped installation base 7 having a target body mounting portion 7b at the upper end. ing.
[0009]
FIG. 3 is a diagram in which the ground control point device 1 and the ground control point device 6 are arranged at the construction site. Since the support 4 of the ground control point device 1 is sharp at the lower end, it can be easily inserted into the topography of the construction site. Is used to indicate the control point set on the slope of the construction site, and the control point device 7 is used to indicate the control point set on the flat part of the construction site.
Since the disk-shaped target body 2 is provided with the high-intensity portions 3 made of reflective seals on both sides, it is possible to take pictures from the front and rear directions of the orientation point devices 1 and 7. In addition, since the high-intensity portion 3 is composed of a reflective sticker, since the reflective sticker is photographed as a bright spot on the photographed image, it is easy to specify the orientation point on the photographic image. . In particular, when a digital camera is used for shooting, it is easier to identify the control point by detecting the pixel of the bright point and highlighting the bright point when displaying the control point on the screen. I can do it.
[0010]
In the present embodiment, the target body 2 and the support body 4 of the ground control point devices 1 and 6 are not integrated with each other, but are coupled by the attachment portion 4b. For example, as shown in FIG. 4, a method for attaching the target body 2 to the support body 4 includes a cylindrical insertion portion 2p and a locking portion 2q having a larger diameter of the insertion portion 2p at the lower portion of the target body 2. Provided with a bolt V to the support 4 so that a step is provided in the hollow portion 4s serving as an insertion port for the attachment portion of the support 4 so that the locking portion 2q does not enter below the step of the hollow 4s. In this way, the target body 2 and the support body 4 are coupled. Depending on the shooting conditions, the surface direction of the target body 2 can be rotated or the target body 2 can be easily replaced.
In FIG. 3, after stereo shooting from the shooting point A and the shooting point B, when the stereo shooting is performed at the shooting point B and the shooting point C, the orientation of the target body 2 of the orientation point devices 6 a and 6 b is rotated closer to the shooting point C. When the image is photographed, the position of the reflective sticker is displayed more clearly in the photographed digital image. Alternatively, when shooting is performed from the shooting points A, B, and C, the target point 2b of the target point device 6b located far from each shooting point is changed to a target body having a larger radius, thereby shooting. The image of can be made clearer.
In addition, the length of the support 4 of the ground control point device 1 may be made extendable and adjustable so that the length of the support 4 can be adjusted depending on the location where the ground control point device 1 is disposed. Alternatively, the support 4 may be formed of a tripod that can be stretched and the length of each leg of the tripod can be adjusted independently. The ground control point device 1 having the support body 4 can be easily installed by adjusting the length of each leg of the support body 4 and can be easily moved when installed on a slope. The position can be easily changed.
[0011]
In the present embodiment, the target body 2 has a disk shape, but as the orientation point device 8, as shown in FIG. 5 , the target body 9 is a sphere, and is reflected by four target points on the equator of the sphere. You may provide the high-intensity part 3 which consists of a seal | sticker. At that time, the high brightness portion 3 is arranged at the intersection of the reference mark 5 with the equator and four meridians of the sphere as the reference mark 5. Since the ground control point device 8 includes the high-intensity part 3 composed of four reflective seals around the circumference, it is possible not only to photograph from any direction on the construction site, but also to identify the ground control point image of the reference mark 5 It can be used as a reference. Needless to say, the number of the high luminance portions 3 is not limited to four. In the above example, the high-luminance portion 3 is configured by a reflective seal, but may be configured by another reflector or a light emitter such as a red lamp.
[0012]
In addition, although the orientation point device directly measures the coordinates of the installation position after installation, the orientation point devices 1, 6, and 9 of the present embodiment are easy to specify on the digital image, and as shown in FIG. In addition, after measuring the coordinates of the ground control point devices 6A, 1A, 6B in the first measurement and proceeding to the excavation of the construction site, it is newly installed in a place where the above ground control point devices can be photographed simultaneously with 1A, 6B. For the established control points 1B and 6C, the coordinate measurement work at the construction site of the control points for obtaining the three-dimensional coordinates by the photography method can be omitted.
[0013]
【The invention's effect】
As described above, the ground control point device according to claim 1 is provided with a plurality of reference marks provided facing a plurality of shooting directions by a support body positioned on the terrain to be imaged and an imaging device such as a digital camera. and the target body target having a high luminance portion disposed at the intersection of the reference mark, since this goal body and a mounting portion for mounting to the support, from a plurality of positions in one orientation points device Photographing is possible, and since the high luminance point is photographed as a bright spot on the image, the orientation point can be easily specified on the digital image.
[0014]
In the orientation point device according to the second aspect, since the high-luminance portion is made of a reflector or a light emitter, the orientation point on the image is further easily identified.
[0015]
In the ground control point device according to claim 3, since the support body is composed of a rod body that has a sharp bottom end and can be inserted into the terrain or an installation base that can be installed on a flat ground, the ground control point device can be easily installed on a flat ground or a slope. I can do it.
[Brief description of the drawings]
FIG. 1 is a perspective view of an orientation point device according to an embodiment of the present invention.
FIG. 2 is a diagram showing another example of a control point device according to an embodiment of the present invention.
FIG. 3 is a diagram showing an arrangement example of a control point device according to the embodiment of the present invention.
FIG. 4 is a diagram showing an example of a method for attaching a target body of the orientation point device according to the embodiment of the present invention.
FIG. 5 is a diagram showing another example of the orientation point device according to the embodiment of the present invention.
FIG. 6 is a diagram showing an example of position measurement of the orientation point device according to the embodiment of the present invention.
FIG. 7 is a view showing a conventional control point device.
[Explanation of symbols]
1, 6, 8 Orientation point device 2 Target body 3 High-intensity part 4 (bar-shaped) support body 5 Reference mark 7 Installation base 9 (Spherical) target body K Slope part P Flat part

Claims (3)

Met apparatus orientation points giving the orientation points such as reference points or path points to be photographed terrain, the support to be positioned in the shooting terrain, provided plurality in opposition to a plurality of imaging directions by the imaging device, a target having a high luminance portion disposed between the reference mark at the intersection of the reference mark, orientation points system, characterized in that the target body and a mounting portion for mounting to the support.   The ground control point device according to claim 1, wherein the high brightness portion is formed of a reflector or a light emitter.   2. The ground control point device according to claim 1, wherein the support body is composed of a rod body having a sharp bottom end and capable of being inserted into the terrain or an installation base that can be installed on a flat ground.

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