Surface models

4 important questions on Surface models

What are the most common interpolation methods?

- Nearest neighbor
- Simple mean
- Kriging
- Inverse Distance Weighted (IDW)
- Spline

What are the charasteristics of inverse distance weight?

- Each input point has a local influence
- This influence diminishes with distance
- Number of input points or all input points within a specified radius
- Output value between minimum and maximum input value
- Best result with evenly distributed input points

What are the charasteristics of spline?

- General purpose interpolation
- Fits a mathematical function to a specified number or nearest input points
- Output value possible below minumum an above maximum input value
- Best results for gently varying surfaces
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What is the aspect of the slope?

A directional measure: the compass direction of the maximum change in elevation on downward direction

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