Bare earth digital elevation model extraction for three-dimensional registration from topographical points
First Claim
1. A method for extracting a digital elevation model from a plurality of raw topographical points representing a plurality of frames, each frame representing a perspective of a multi-dimensional object comprising a surface and above-surface obstructions, the method comprising:
- finding the surface by filtering out data points representing the above-surface obstructions to provide a plurality of surface data points representing the surface; and
filtering the surface data points with a competitive filter to provide a multi-dimensional surface shell of digital elevation model data points comprising a plurality of filtered frames.
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Abstract
A method (300) for extracting a digital elevation model from a plurality of raw topographical points representing a plurality of frames representing a plurality of perspectives of a multi-dimensional object comprising a surface and above-surface obstructions, comprises steps or acts of: finding the surface (304) by filtering out data points produced by the above-surface obstructions to provide a plurality of surface data points representing the surface; and filtering the surface data points (306) with a competitive filter to provide a multi-dimensional surface shell of digital elevation model data points. The above-described method can also be carried out by a specialized or programmable information processing system (200) or as a set of instructions in a computer-readable medium such as a CD ROM or DVD or the like.
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Citations
19 Claims
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1. A method for extracting a digital elevation model from a plurality of raw topographical points representing a plurality of frames, each frame representing a perspective of a multi-dimensional object comprising a surface and above-surface obstructions, the method comprising:
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finding the surface by filtering out data points representing the above-surface obstructions to provide a plurality of surface data points representing the surface; and filtering the surface data points with a competitive filter to provide a multi-dimensional surface shell of digital elevation model data points comprising a plurality of filtered frames. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for extracting a bare earth digital elevation model from a plurality of raw topographical points representing a multi-dimensional object comprising a surface and above-surface obstructions, the system comprising:
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a ground finder for finding a ground surface by receiving the plurality of raw topographical Points representing a plurality of frames, each frame representing a portion of the surface and filtering ground points from above-ground obstruction points to provide a plurality of ground points representing the ground surface; and a competitive filter for filtering the ground points to obtain a multi-dimensional shell of digital elevation model points. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A computer readable medium comprising program instructions for extracting a digital elevation model from a plurality of raw topographical points representing a plurality of frames representing a plurality of perspectives of a multi-dimensional object comprising a surface and above-surface obstructions, the medium comprising instructions for:
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finding the surface by filtering out data points produced by the above-surface obstructions to provide a plurality of surface data points representing the surface; and filtering the surface data points with a competitive filter to provide a multi-dimensional surface shell of digital elevation model data points comprising a plurality of filtered frames. - View Dependent Claims (17, 18, 19)
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Specification