Slope and Aspect. Calculated from a grid of elevations (a digital elevation model) Slope and aspect are calculated at each point in the grid, by comparing the point’s elevation to that of its neighbors usually its eight neighbors but the exact method varies
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9Typical Slope Calculation
Longley et al., chs. 13 and 14
width of the original object
for point objects
2. Minimum Curvature Spline
3. Inverse Distance Weighted 4. Kriging