Abstract: When repairing a road, it is possible to easily conduct a survey on the road condition at the time of starting repair. The ortho-image creation method of the present invention includes a coordinate acquisition step to acquire three-dimensional coordinates of a plurality of survey markers 6, a photography step to photograph a plurality of photographed images of the plurality of survey markers 6 by a UAV 3 flying at an altitude of 20 meters or less above the ground in such a manner that each survey marker 6 is included in at least two of the photographed images, and an ortho-image creation step to create an ortho-image on the basis of the three-dimensional coordinates of each feature point acquired by the coordinate acquisition step and the plurality of photographed images photographed by the photography step.

Abstract: The ground information about the uneven state of the ground is easily detected. A ground information detection method according to the present invention includes: a point group data acquisition step for acquiring point group data generated as three-dimensional coordinates for each point on the ground with laser light emitted from a three-dimensional scanning device installed at a known point; and a ground information detection step for detecting ground information about an uneven state of the ground using the point group data acquired at the point group data acquisition step.

Abstract: An ortho-image creation method includes: first photographing of photographing a road; second photographing of photographing an area covered by the obstacle from an altitude lower than the obstacle by a second photographing apparatus, and obtaining a plurality of second photographed images; first coordinate acquisition of acquiring three-dimensional coordinates; second coordinate acquisition of acquiring three-dimensional coordinates of a second feature point located in the area covered by the obstacle and included in at least two of the plurality of second photographed images; and ortho-image creation of creating a corrected ortho-image obtained by correcting at least a part of the area covered by the obstacle in the road surface to an area not covered by the obstacle, on the basis of the plurality of first photographed images, the plurality of second photographed images, the three-dimensional coordinates of the first feature point, and the three-dimensional coordinates of the second feature point.

Abstract: When a road is repaired, it is easy to conduct a survey on a road condition of the road at the time of start of repair. An orthoimage creation method of the present invention includes: a coordinate acquisition step of acquiring three-dimensional coordinates for a plurality of feature points; a photographing step of photographing, by a camera 3, a plurality of photographed images such that each of the plurality of feature points is included in at least two of the photographed images; and an orthoimage creation step of creating an orthoimage with a ground pixel size of 5 mm or less on the basis of the three-dimensional coordinates of each of the feature points acquired in the coordinate acquisition step, and the plurality of photographed images photographed in the photographing step.

Abstract: When repairing a road, it is possible to easily conduct a survey on the road condition at the time of starting repair. The ortho-image creation method of the present invention includes a coordinate acquisition step to acquire three-dimensional coordinates of a plurality of survey markers 6, a photography step to photograph a plurality of photographed images of the plurality of survey markers 6 by a UAV 3 flying at an altitude of 20 meters or less above the ground in such a manner that each survey marker 6 is included in at least two of the photographed images, and an ortho-image creation step to create an ortho-image on the basis of the three-dimensional coordinates of each feature point acquired by the coordinate acquisition step and the plurality of photographed images photographed by the photography step.

Abstract: The ground information about the uneven state of the ground is easily detected. A ground information detection method according to the present invention includes: a point group data acquisition step for acquiring point group data generated as three-dimensional coordinates for each point on the ground with laser light emitted from a three-dimensional scanning device installed at a known point; and a ground information detection step for detecting ground information about an uneven state of the ground using the point group data acquired at the point group data acquisition step.

Abstract: An ortho-image creation method includes: first photographing of photographing a road; second photographing of photographing an area covered by the obstacle from an altitude lower than the obstacle by a second photographing apparatus, and obtaining a plurality of second photographed images; first coordinate acquisition of acquiring three-dimensional coordinates; second coordinate acquisition of acquiring three-dimensional coordinates of a second feature point located in the area covered by the obstacle and included in at least two of the plurality of second photographed images; and ortho-image creation of creating a corrected ortho-image obtained by correcting at least a part of the area covered by the obstacle in the road surface to an area not covered by the obstacle, on the basis of the plurality of first photographed images, the plurality of second photographed images, the three-dimensional coordinates of the first feature point, and the three-dimensional coordinates of the second feature point.