Decision Analysis
Multi-criteria decision making (MCDA) is used to logically evaluate and compare multiple criteria that are often conflicting to make the best possible decision
State the problem/objective
Establish criteria (factors and constraints)
State the problem/objective
Establish criteria: factors and considerations
Factor = criterion that enhances or lowers the suitability of a specific alternative for the activity under consideration
Constraint = criterion that limits the alternatives under considerations
Standardize factors - put factors all on the same scale to facilitate comparison
Reclass Boolean – either 1 or 0
Reclass multiple classes – range of values (Useful when integrating multiple considerations and factors)
Reclass fuzzy approach – continuous scale of values
Establish factor weights by using one of the following methods:
Ranking: rank factors with 1, 2, & 3
Rating: rate factors using percentile
Pairwise comparison: Analytical Hierarchy Process (AHP)
Matrix is constructed where each criterion is compared with the other, relative to its importance
A weighted estimate is calculated and used to derive a consistency ratio (CR) of the pairwise comparisons
These are usually converted to numerical weights on a scale of 0 to 1 with an overall summation of 1 (normalization)
Aggregate the criteria
Boolean overlay (BOOLEAN AND)
Weighted Linear Combination (formula)
Weighted linear overlay, fuzzy overlay
Validate/verify the results to assess the reliability of the output, asking do the results reflect reality?
Ground truth verification
Sensitivity analysis – how do the following affect the result
1. Altering the set of criteria 2. Alerting the respective weights of the factors 3. Is the result reasonable?
Similar to a flow chart in programming, where it should all the logical steps you take in order to achieve the final map/results. It shows the whole map of what we are doing, without the map, by showing the data and the processes.
Steps to creating a Flow Chart of Research:
Identify what kind of data we need for the project
Both shapefiles and tables
Input the constraints/conditions to classify the map as wither suitable or unsuitable
Using either the values of the variables or a buffer area
Constraints are delineated in red lines, conditions are delineated in green lines
Merging unsuitable and suitable map creates the final potential site maps
Multi-criteria decision making (MCDA) is used to logically evaluate and compare multiple criteria that are often conflicting to make the best possible decision
State the problem/objective
Establish criteria (factors and constraints)
State the problem/objective
Establish criteria: factors and considerations
Factor = criterion that enhances or lowers the suitability of a specific alternative for the activity under consideration
Constraint = criterion that limits the alternatives under considerations
Standardize factors - put factors all on the same scale to facilitate comparison
Reclass Boolean – either 1 or 0
Reclass multiple classes – range of values (Useful when integrating multiple considerations and factors)
Reclass fuzzy approach – continuous scale of values
Establish factor weights by using one of the following methods:
Ranking: rank factors with 1, 2, & 3
Rating: rate factors using percentile
Pairwise comparison: Analytical Hierarchy Process (AHP)
Matrix is constructed where each criterion is compared with the other, relative to its importance
A weighted estimate is calculated and used to derive a consistency ratio (CR) of the pairwise comparisons
These are usually converted to numerical weights on a scale of 0 to 1 with an overall summation of 1 (normalization)
Aggregate the criteria
Boolean overlay (BOOLEAN AND)
Weighted Linear Combination (formula)
Weighted linear overlay, fuzzy overlay
Validate/verify the results to assess the reliability of the output, asking do the results reflect reality?
Ground truth verification
Sensitivity analysis – how do the following affect the result
1. Altering the set of criteria 2. Alerting the respective weights of the factors 3. Is the result reasonable?
Similar to a flow chart in programming, where it should all the logical steps you take in order to achieve the final map/results. It shows the whole map of what we are doing, without the map, by showing the data and the processes.
Steps to creating a Flow Chart of Research:
Identify what kind of data we need for the project
Both shapefiles and tables
Input the constraints/conditions to classify the map as wither suitable or unsuitable
Using either the values of the variables or a buffer area
Constraints are delineated in red lines, conditions are delineated in green lines
Merging unsuitable and suitable map creates the final potential site maps