Risk mapping
Practical Action
4. Analysis of the threat map
The threat map obtained in the previous step is made up of numbers that need to be
reclassified to assign them qualitative values.
For example, the following table displays the numbers obtained in the threat map.
Quantitative Value
1
2
3
4
Qualitative Value
Low
Medium
High
Very high
Low:
Medium:
High:
Very high:
Expresses minimal values and does not constitute a potential threat
Expresses intermediate values and could constitute a potential threat
Expresses high values and constitutes a threat
Expresses very high values and constitutes an extreme threat
For example
A community which is located on a steep slope and receives a lot of precipitation in the
summer months is considered at a value of 4, whereas the same community in a slightly flat
area, but also receiving precipitation is considered at a value of 1.
5. Validation of the landslide map in workshop and preparation of the final version.
How are vulnerability maps prepared?
1. Initial inputs
Existing socio-
economic data.
Design of
vulnerability
forms
3