When does a cell change to built-up in this model?
For a selected test pixel, the algorithm compares the corresponding values in the auxiliary layers against user-defined thresholds. If the threshold requirement is met, the cell value is changed to 1, interpreted as built-up growth.
Conditions
- A test pixel is selected from the main raster.
- Each relevant auxiliary layer value is compared with its user-defined threshold.
- Transition occurs only when the threshold requirement is satisfied.
Reasoning, step by step
- Select a test pixel in the main raster.
- Read the corresponding values from the auxiliary layers (Road distance, CBD distance, Population density, Slope).
- Compare each relevant layer value with the user-defined threshold.
- If the threshold requirement is met, replace the cell value with 1 (built-up).
Example
The speaker says the model checks whether the value of that layer is greater than the threshold defined by the user, and if so replaces the value to 1, which is built up. The animation highlights one target cell and the audio discusses the second pixel with value two in the main raster.
Common misconceptions
- The clip does not specify whether all four layers must satisfy their thresholds simultaneously or whether different rules apply per layer. The exact numerical thresholds are not stated in this clip.
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Answers are generated from source material and independently checked. Consult the original video or creator if something is unclear.