Spatial
Analysis
I put legend in each map to apply Boolean
Overlay Approach. To put legend, I
had to convert the original data and categorize them.
To
find out how ¡°Reclass¡± was done, please refer to Cartographic Boolean Model and graphs.
The
following maps are made using Boolean unit. Using modules called ¡°Reclass¡± or ¡°Edit¡± and ¡°Overlay,¡±
number 0 is assigned to area of low to none landslide susceptible area and
number 1 is assigned to highly landslide susceptible area. The maps produced using Boolean overlay
approach shows clearly distinguishing the areas with high and low landslide
occurrence using yellow color for low to none landslide susceptible area while
brown for high susceptibility.
Boolean
Overlay Approach is one of good methods to predict landslide occurrence
susceptibility. Being a very
conservative method, it successfully predicts the most landslide susceptible
area with accuracy; however it often lacks accuracy to predict medium to low
susceptible areas. Compared to
Weighted Linear Combination method, Boolean Overlay Approach predicts less area
in total; however the indicated high susceptible areas with very high accuracy.
The brown colored
areas of the map are the areas that need special attention as they are highly
susceptible for landslide. They
have all the factors that support high landslide susceptibility and therefore
the government needs to dedicate financial assistance and prevention programs
in order to prevent any potential disaster. Primary prevention program include restricting the area from
entering and restrict residential development, and further prevention programs
include building barriers.
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for Methodological and Operational Problems/Conclusion
Or
click here for Spatial Analysis (WLC)
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