Soil Projects > SOTER(Soil Terrain Database) > SOTER Model
in the following figure, it is prerented the SOTER model:
In SOTER model, Mapping Units are defined by physiography and litholog. Physisography is characterized by 4 differentiating features:
- Slope intensity - Regional Slope classification
- Relief intensity
- Hypsometry (altitude in consideration of the relief intensity)
- Dissection (PDD: potential drainage density)
Slope intensity - Regional Slope classification
The Slopes are classified as following:
and they are processed acording to the following 4 phases (Slopes - Classifies slopes - Resampled slopes - Filtered slopes):
Relief Intensity
Find the median difference between the highest and lowest point within the
terrain per specified distance. Units can be considered the m/km, m/slope unit,
m/2 km.
Changes of the approach: interpret relief intensity on an aerial
basis.
| 0-50 m/area of a 1 km diameter circle |
| 50-100 m/area of a 1 km diameter circle |
| 100-300 m/area of a 1 km diameter circle |
| 300- m/area of a 1 km diameter circle |
and process according to the following 3 phases (Continuous relief intensity
- Classified relief intensity -Classified and resampled
relief intensity map) :
Hypsometry
As Hypsometry it is defined the altitude in consideration of the relief intensity.
| Level and sloping lands with RI<50m/slope unit | Sloping lands with RI>50 m/slope unit | Steep and sloping lands with RI>600m/2 km |
|---|---|---|
< 300 m |
< 200 m |
600 -1500 m |
300 - 600 m |
200 - 400 m |
1500 - 3000 m |
600 -1500 m |
400 < …m |
3000 - 5000 m |
1500 - 3000 m |
||
3000 < ….m |
The Hypsometry classes are according to the elevation range as following:
Dissection ( PDD: Potential Drainage Density)
Some remarks about the Potential drainage density (PDD):
- Deriving surface drainage system based on digital elevation data:
- 1.flowdirection
- 2. flowaccumulation
- 3. recoding
- 4. cells having flowaccumulation value higher than a certain - resolution dependent - value are assigned a value of “1” (stream cells) while all others are assigned value “0” (background).
- A specified sized moving window is sent through the image for counting the stream cells within a given area around each cell and the output value of this function is assigned to the corresponding cell.
Find below the The PDD (Potential Drainage Density) class ranges:
| Class | PDD value range |
|---|---|
| 1: less dissected areas, convex surfaces | 0-90 |
| 2: more dissected areas or depressions, concave surfaces |
Above 90 |
after aplying the above classes, the The resulting PDD layer is the following:
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