Table 2 Spatial explanatory data sets evaluated in logistic regression models.
Explanatory variable | Description | Method | Data scale | layers |
|---|---|---|---|---|
Slope | Slope | DEM analysis | ratio | 1 layer |
Aspect | Aspect | DEM analysis | ratio | 1 layer |
Land Cover | Vegetation/land use | Supervised classification of ETM data | nominal | 1 layer, 3 classes |
Distance | Distance of sampling point from water line at sampling date | DEM simulation, spatial queries | ratio | 21 layers for each field sampling date |
Shoreline index | Reservoir margin shape: relation of water and soil pixels | DEM simulation, convolution filter, overlay, spatial query | ratio | 21 layers for each field sampling date |