Land degradation/Description: Difference between revisions
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* 0.0 for natural vegetation. | * 0.0 for natural vegetation. | ||
Land cover is characterised by a remotely sensed {{abbrTemplate|NDVI}} map. The soil property v at location x with soil s is estimated as | Land cover is characterised by a remotely sensed {{abbrTemplate|NDVI}} map. The soil property v at location x with soil s is estimated as | ||
{{DisplayFigureLeftOptimalTemplate|Formula1 LD|plain}} | {{DisplayFigureLeftOptimalTemplate|Formula1 LD|plain}} | ||
with w<sub>x </sub>being a weight w∈ [0..1] that determines where v is in the range [v<sub>ls</sub>..v<sub>hs</sub> ]. Different explanatory factors represented by the landscape properties determine w. The weight at location x is calculated as | with w<sub>x </sub>being a weight w∈ [0..1] that determines where v is in the range [v<sub>ls</sub>..v<sub>hs</sub> ]. Different explanatory factors represented by the landscape properties determine w. The weight at location x is calculated as | ||
{{DisplayFigureLeftOptimalTemplate|Formula4 LD|plain}} | |||
The weight w<sub>px</sub> for landscape property p is calculated as: | The weight w<sub>px</sub> for landscape property p is calculated as: | ||
{{DisplayFigureLeftOptimalTemplate|Formula2 LD|plain}} | |||
In which c<sub>pv</sub> is a constant that indicates the relative importance of the landscape property p for a soil property v. The sign of c<sub>pv</sub> indicates whether there is a positive or negative relationship between the landscape property and the soil property. | In which c<sub>pv</sub> is a constant that indicates the relative importance of the landscape property p for a soil property v. The sign of c<sub>pv</sub> indicates whether there is a positive or negative relationship between the landscape property and the soil property. | ||
When | When | ||
{{DisplayFigureLeftOptimalTemplate|Formula3 LD|plain}} | |||
the w∈ [0..1] and all values in the range [v<sub>ls</sub>..v<sub>hs</sub> ] are possible based on the landscape properties. Although in practice c is specific for each landscape property, soil type, and soil property, data are lacking to estimate c at that level of specificity. Therefore the model assumes that c is constant per soil and landscape property, or, in other words, the relative impact of landscape properties on a specific soil property is assumed to be constant over the different soil types. | the w∈ [0..1] and all values in the range [v<sub>ls</sub>..v<sub>hs</sub> ] are possible based on the landscape properties. Although in practice c is specific for each landscape property, soil type, and soil property, data are lacking to estimate c at that level of specificity. Therefore the model assumes that c is constant per soil and landscape property, or, in other words, the relative impact of landscape properties on a specific soil property is assumed to be constant over the different soil types. | ||
Revision as of 12:02, 19 May 2014
Parts of Land degradation/Description
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| Projects/Applications |
| Models/Databases |
| Key publications |
| References |
