Apparatus and method for terrain model reproduction
AssigneeKobashigawa
InventorMasaharu Ishii
Life of this patent
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Abstract
The present invention relates to a method and an apparatus which reproduce a digital terrain model (DTM) from contour data with geomorphological consistency and natural features including fine folds. An initial DTM ho is produced (step 101), and set ho as an initial value (step 102). Then the operator T which smooths the elevational values along flowing water lines or the neighborhood of the lines is operated on the DTM h (step 103), further the operator B which sets the boundary values by substituting the contour data is operated on the DTM h (step 104). The number n of operating times of the steps 103 and 104 is checked (step 105). If n is less than preset number nmax, return to the step 103 and if n reaches nmax, go to the step 106 and the DTM h is output.
Claims20
A terrain model production apparatus comprising:
- a first means for setting an initial terrain model calculated as a function defined on two-dimensional plane from contour data;
- and
- a second means for producing a terrain model by solving a boundary value problem including an operator which smoothes elevational values of a terrain model along flowing water lines or their neighborhoods with said contour data as boundary values by an iterative method with said initial terrain model.
A terrain model modification apparatus comprising:
- means for storing a terrain model as an initial value;
- and
- a modificatory filter operable once or recursively on the stored terrain model which smoothes elevational values along flowing water lines or their neighborhoods.
A terrain model production method comprising:
- a first step of setting an initial terrain model calculated as a function defined on two-dimensional plane from contour data;
- and
- a second step of producing a terrain model by solving a boundary value problem including an operator which smoothes elevational values of a terrain model along flowing water lines or their neighborhoods with said contour data as boundary values by an iterative method with said initial terrain model.
A terrain model production method comprising:
- a first step of setting contour data as boundary values;
- and
- a second step of calculating a terrain model as a function defined on two-dimensional plane by at least simulating rain erosion under a boundary condition set by the first step.
In a terrain modeling method operable on a computer for reproducing a terrain model with geomorphological consistency and natural features including folds, the improvement comprising:
- a first step of setting a terrain model as an initial value;
- and
- a second step of operating an operator once or recursively which smoothes elevational values of the terrain model along flowing water lines or their neighborhoods.
A recording medium in which a computer program is stored, said program being provided for executing:
- calculating a terrain model as a function defined on a two-dimensional plane from contour data and setting said model as an initial terrain model;
- and
- producing a terrain model by solving a boundary value problem including an operator which smoothes elevational values of a terrain model along following water lines or their neighborhoods with contours as the boundary values by an iterative method with said initial terrain model.
Dependencies are inferred from the claim text.