A data analysis device, a data analysis method, and a program

Japanese Patent JP6097182

B2

PROBLEM TO BE SOLVED: To automatically detect, with high accuracy, a change in the shape of a feature surface having an inclined plane covered with vegetation, on the basis of three-dimensional coordinate data of a point group extracted from the feature surface.SOLUTION: Point group adjustment means 22 calculates a height adjustment point group by applying movement defined by a vector in a perpendicular direction from a surface point of a reference model to a reference horizontal line to a perspective point group along a vertical cut plane. Contour line extraction means 24 extracts, as a result indicating a shape change, a contour line along the lower edge of a distribution area within the cut plane of the height adjustment point group. Unit area setting means 30 divides the cut plane into lattice form and sets a plurality of unit areas. Lower-limit unit area setting means 32 examines each vertical row of the unit areas in order from bottom to top and extracts a lower-limit unit area in which the height adjustment point group appears first. Feature point extraction means 34 extracts, as a feature point, a lowest point in height among the height adjustment point group within the lower-limit unit area. Contour line determination means 38 obtains, as a contour line, a polygonal line having the feature point at a node.

Yoshioka Yuji
Hideki Shimamura
Manabe

JP2013176566A

March 15, 2017

August 28, 2013

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Pasco Co., Ltd.

G01C7/02; G01C15/00; G06T1/00

JP2011158278A
JP2009204615A
JP2008009723A
JP2004272688A

Haruka International Patent Office

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