Change Mapping Strategies in Geography
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Questions and Answers

If you want to evaluate the effectiveness of a new transportation policy, what type of change analysis would be most helpful?

  • Change in Location Data
  • Change in character or magnitude (correct)
  • Both Change in Location Data and Change in character or magnitude
  • None of the above
  • What is a key factor in identifying the best method for mapping change?

  • The type of change being analyzed
  • The type of features being mapped
  • The time period over which the change is being measured
  • All of the above (correct)
  • What type of data is represented by a change in character or magnitude that shows the quantity of a feature?

  • Events
  • Discrete features
  • Continuous values
  • Data summarized by categories (correct)
  • Which of the following is NOT a reason to map change?

    <p>To create a static representation of data (D)</p> Signup and view all the answers

    Which type of feature is BEST represented as a tracking map?

    <p>Events (C)</p> Signup and view all the answers

    Which type of feature would be best suited for mapping the spread of a disease?

    <p>Events (C)</p> Signup and view all the answers

    How can you map the change in the population density of a city over time?

    <p>Creating a time series of population counts for different areas within the city (C)</p> Signup and view all the answers

    What is the primary benefit of understanding how things behave over time?

    <p>All of the above (D)</p> Signup and view all the answers

    How many maps should be used to visualize a trend in the movement of a phenomenon represented by discrete events?

    <p>As many as needed to show the trend clearly (B)</p> Signup and view all the answers

    When mapping contiguous features, what is the best approach to depict the movement of the feature?

    <p>Use different colors to represent the feature at different points in time (B)</p> Signup and view all the answers

    What method can be used to show changes in the magnitude of a feature over time?

    <p>All of the above (D)</p> Signup and view all the answers

    If the boundaries of the areas being mapped have changed over time, what should be done to handle these changes?

    <p>Both B and C (C)</p> Signup and view all the answers

    When visualizing changes in value for each area from one time period to another, what type of chart can be used?

    <p>Bar chart (A)</p> Signup and view all the answers

    What is the most common strategy when representing negative values in change calculations?

    <p>Using a different color for negative values (C)</p> Signup and view all the answers

    Why is it difficult to visually compare more than 5 or 6 maps?

    <p>All of the above (D)</p> Signup and view all the answers

    How can the speed of movement of a feature be visualized when mapping individual features?

    <p>Use a shorter distance between points for faster movement (B)</p> Signup and view all the answers

    What is the performance value for the 'Selective Clearing' option in the Riparian Vegetation Management example?

    <p>0.69 (A)</p> Signup and view all the answers

    In Step 2: Structuring the decision problem of the 6-Step Procedure, what does 'SMART' represent?

    <p>Specific, Measurable, Achievable, Relevant, Time-bound (A)</p> Signup and view all the answers

    Which of the following is NOT a step in the 6-Step Procedure for Multi-Criteria Evaluation (MCE)?

    <p>Prioritizing alternatives (B)</p> Signup and view all the answers

    What is the purpose of assigning weights to each criterion in MCE?

    <p>Reflecting the relative importance of each criterion (D)</p> Signup and view all the answers

    Which method of scoring alternatives in relation to criteria involves determining the likelihood of a location being suitable for a specific purpose?

    <p>Fuzzy membership (B)</p> Signup and view all the answers

    In the Performance Matrix, which criterion holds the highest weight in the Riparian Vegetation Management example?

    <p>Landscape (A)</p> Signup and view all the answers

    What does 'Sj' represent in the weighted summation formula: Sj = Σ (i-1) Wi Xij?

    <p>The weighted score of an alternative (A)</p> Signup and view all the answers

    How are performance values determined in the Riparian Vegetation Management example?

    <p>Based on expert opinion and historical data (A)</p> Signup and view all the answers

    What value (on a scale of 0 to 1) represents a criterion that is considered the most important?

    <p>1 (B)</p> Signup and view all the answers

    In the AHP method, what does the 'CR' represent?

    <p>A measure of consistency in judgments (A)</p> Signup and view all the answers

    What is one benefit of using the AHP method for weighing criteria?

    <p>It allows for the incorporation of both quantitative and qualitative factors (B)</p> Signup and view all the answers

    You are evaluating the impact of a new irrigation system on a river. Which of the following criteria would NOT be appropriate for using the AHP method?

    <p>The overall public opinion on the new system (A)</p> Signup and view all the answers

    In the provided AHP matrix, which criterion is considered to be the least important for the evaluation?

    <p>Profit (B)</p> Signup and view all the answers

    Which of the following statements is CORRECT about the AHP method?

    <p>It provides a structured approach for prioritizing criteria (D)</p> Signup and view all the answers

    What does the 'NON-WEIGHTED MCE (binary)' approach involve?

    <p>Classifying criteria as either good or bad (B)</p> Signup and view all the answers

    When conducting an AHP analysis, what should you do if the Consistency Ratio (CR) is greater than 0.10?

    <p>Re-evaluate the judgments made during the pairwise comparison process (C)</p> Signup and view all the answers

    Which of the following is NOT a method of multicriteria decision analysis (MCDA)?

    <p>Ground truth verification (C)</p> Signup and view all the answers

    In the context of GIS-based MCDA, what does 'sensitivity analysis' involve?

    <p>Assessing the impact of changes in criteria weights on the results. (C)</p> Signup and view all the answers

    What is the primary advantage of using a weighted linear combination (WLC) in MCDA?

    <p>It allows for the incorporation of subjective preferences into the decision-making process. (C)</p> Signup and view all the answers

    Which of the following GIS packages is mentioned as having specialized modules for MCDA, including standardization and weighting functionalities?

    <p>Teer set (A)</p> Signup and view all the answers

    What kind of data is typically used to create a digital elevation model (DEM)?

    <p>All of the above (D)</p> Signup and view all the answers

    Which of the following is a valid reason to apply the KISS approach (Keep It Simple and Stupid) to MCDA?

    <p>To ensure that the analysis is focused on the most important criteria only. (C)</p> Signup and view all the answers

    Which of the following is NOT a characteristic of 3D GIS?

    <p>The Z-value in 3D GIS always represents real-world elevation. (C)</p> Signup and view all the answers

    Which of the following statements BEST describes the importance of validation in GIS-based MCDA?

    <p>Validation enhances the credibility of the results by comparing them to real-world observations or expert opinions. (A)</p> Signup and view all the answers

    Which of the following is NOT a key component of GIS-based MCE?

    <p>Data Visualization (D)</p> Signup and view all the answers

    What is the main difference between 'Factors' and 'Constraints' in the context of criteria for MCE?

    <p>Factors represent desired conditions, while Constraints represent limitations or boundaries. (C)</p> Signup and view all the answers

    What is the primary purpose of using z layers in calculating change in continuous categories?

    <p>To compare data from different time points and identify areas of change. (C)</p> Signup and view all the answers

    In the second approach to calculating change in continuous categories, how is the area change calculated?

    <p>Subtracting the area of the original layer from the area of the changed layer for each category. (B)</p> Signup and view all the answers

    What is the main advantage of using a GIS-based approach for MCE?

    <p>GIS enables a more objective evaluation of alternatives by incorporating spatial factors. (A)</p> Signup and view all the answers

    What is the main limitation of using only GIS and spatial analysis for decision-making?

    <p>Spatial analysis alone cannot account for the values and preferences of decision-makers. (D)</p> Signup and view all the answers

    Which of the following statements accurately describes the first approach to calculating change in continuous categories?

    <p>It involves overlaying two layers to create a new layer representing areas of change. (D)</p> Signup and view all the answers

    Which of these is a NOT a correct description of the third approach for calculating change in continuous categories?

    <p>The third approach creates a new layer that highlights areas of change, just like the first approach. (A)</p> Signup and view all the answers

    Flashcards

    Geospatial Intelligence

    The use of data related to geographic locations to gain insights.

    Why map change?

    Mapping change helps understand behavior, anticipate futures, and evaluate actions.

    Types of change

    Categories of change include location data and character/magnitude changes.

    Change in Location Data

    Tracks how features move in space over time, predicting future locations.

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    Change in character or magnitude

    Shows how conditions like quantity or type of features have altered.

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    Discrete features

    Individual or unique features tracked as they move or change.

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    Events

    Geographic phenomena that occur at different locations over time.

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    Continuous values

    Quantities that can exist at any location, measured continuously.

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    Number of maps to show

    Use fewer maps for clear change; more maps reveal patterns.

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    Mapping individual features

    Connect feature positions over time with lines to show movement.

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    Mapping linear features

    Illustrate changes before and after an event using colors or symbols.

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    Mapping contiguous features

    Draw or shade area boundaries over time to show movement.

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    Mapping events

    Use colors to distinguish events before and after a time point.

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    Measuring Change

    Summarize data changes by area using bar charts or trend lines.

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    Negative values

    Negative changes indicate a decrease, often shown in blue.

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    Boundary changes

    Historical changes in boundaries can complicate mapping but can often be ignored.

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    Normalization

    Adjusting values to a common scale, generally from 0 to 1.

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    Analytical Hierarchy Process (AHP)

    A structured technique for organizing and analyzing complex decisions using pairwise comparisons.

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    Consistency Ratio (CR)

    A measure assessing the consistency of judgments in pairwise comparisons in AHP.

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    Weighted Criterion

    A criterion assigned a numerical weight based on its relative importance.

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    Pairwise Comparison Matrix

    A grid used in AHP to compare criteria against each other.

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    Mean Value Calculation

    The average taken from the values of a row in the comparison matrix to determine weight.

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    Eigen Vector

    A mathematical vector indicating the direction of the greatest variance for weights in AHP.

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    Criteria Classification (Binary)

    Categorizing alternatives as good (1) or bad (0) without weights in decision-making.

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    Weighted Linear Combination (WLC)

    A commonly used decision rule in GIS-based MCDA that combines factors using weighted averages.

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    Multicriteria Decision Analysis (MCDA)

    A process used to evaluate multiple conflicting criteria in decision-making situations.

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    Sensitivity Analysis

    Evaluating how changes in criteria or weights affect the results of an analysis.

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    Ground Truth Verification

    A process to compare analysis results with real-world observations through surveys.

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    Digital Elevation Model (DEM)

    A raster representation of elevation values for continuous surfaces.

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    Contour Lines

    Lines on a map connecting points of equal elevation or value.

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    Ordered Weight Average (OWA)

    A method of combining factors in decision analysis based on their ordered acceptance.

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    GIS-Based MCE

    Geographic Information System-driven analysis for decision-making in complex scenarios.

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    Change Calculation in GIS

    The process of determining alterations in spatial data across time points using different layers.

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    Layer Overlay Method

    Combining multiple layers in GIS to identify differences between them.

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    Area Change Calculation

    Subtracting the area of one category from another to find the change over time.

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    Change Map Creation

    Subtracting two surface layers in GIS to visualize the differences cell by cell.

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    GIS-Based MCE Introduction

    A framework that aids in selecting optimal locations through socio-technical decision-making processes.

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    Decision Alternatives

    Different options considered in a decision-making process within GIS-based MCE.

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    Criteria in MCE

    Guidelines or requirements that influence decision-making based on project needs and goals.

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    Decision Rule

    A numerical method that prioritizes decision alternatives based on how well they meet criteria.

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    Riparian Vegetation Management

    A process aimed at managing vegetation near water bodies for ecological purposes.

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    Performance Value

    A numerical representation of an alternative's effectiveness based on criteria weights.

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    Weighted Summation

    A method used to calculate overall scores by multiplying weights with performance values.

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    MCE

    Multi-Criteria Evaluation, a decision-making model that evaluates several conflicting criteria.

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    6-Step MCE Procedure

    A systematic method for making decisions involving multi-criteria evaluations.

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    Decision Context

    The background information and aims for the decision-making process in MCE.

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    Scoring Alternatives

    Assigning scores to different options based on their performance against criteria.

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    Criteria Weights

    Numerical values that reflect the importance of each criterion in the decision process.

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    Study Notes

    Geospatial Intelligence (GIS) Test

    • GIS lets you map where things move over time. Understanding changes can help evaluate the results of an action or policy.

    • Topics include:

      • Why map change?
      • Defining your analysis
      • Three ways of mapping change
      • Creating a time series map
      • Creating a tracking map
      • Measuring and mapping change
    • Why Map Change?

      • Gain insight into how things behave
      • Anticipate future conditions/needs
      • Decide on a course of action
      • Evaluate results of an action by mapping conditions before and after an action.
    • Defining Your Analysis

      • Show location of features at each date
      • Calculate and map the differences in value for each feature over more dates.

    Types of Change

    • Change in Location: Helps predict where features will move.
    • Change in Character or Magnitude: Shows how conditions have changed in a place, the change can be in the type of feature or a quantity associated with each feature.

    Geographic Features

    • Type of features you're mapping help determine the best method to map change.
    • Features that move:
      • Discrete features (tracked as they move through space, they might be individual, linear, or features of areas)
      • Events (geographical phenomena that occur at different locations, the movement can be tracked and mapped for that period of time)

    Measuring Time

    • Time Patterns: Shows change between two or more dates or times.
      • Indicates whether something is increasing or decreasing
      • Shows the direction of feature movement as cycles

    Comparing Methods

    • Time Series: Strong visual impact if change is substantial, shows condition at each date/time; Requires visual comparison of maps, difficult to read if many features/dates
    • Trend: Shows overall direction of change (generally easier to read than a time series)
    • Cycle: Shows repeating patterns of change
    • Before and After: Shows actual amounts of change; Doesn't always show actual conditions at each time point

    Methods to Use

    • Time Series: Snapshots of map features over two or more times. Used to show features either moving or changing in character.
    • Tracking Maps: Show movement of features over a period of time. Measuring change between locations
    • Measuring Change: Shows calculated differences; Useful for comparing attributes over two or more time periods.

    MCE Procedure

    • Step 1: Establishing Context: Identify aims of decision makers, establishing a shared understanding of the problem.
    • Step 2: Structuring: Identifying objectives, alternatives, and criteria; criteria should be specific, measurable attainable, relevant, and time-bound
    • Step 3: Scoring Alternatives: Set/use common scale for suitability and comparisons. Fuzzy membership can be used to assign numerical values (range 0-100) reflecting likelihood of a location being suitable
    • Step 4: Determine Weights: Ranking, ratings, and pairwise comparisons of criteria are used to assign relative importance to each component.
    • Step 5: Evaluating Alternatives (Non-weighted or weighted Linear Combination): Non-weighted methods classify criteria based on good or bad (1 or 0); Weighted methods use geometric mean calculations to determine scores which may apply to multiple criteria.
    • Step 6: Validation/Verification: Confirm sample areas through field surveys to verify results.

    Sensitivity Analysis

    • Assessing how changes in weights/criteria affect evaluation results.

    GIS Packages

    • Tools:
      • ArcGIS (Decision Support Modules: fuzzy to standardize factors; Weights calculate actual evaluation; model builder)
      • QGIS;
      • Geoserver;
      • Maps server.
      • Other tools.
    • WebGIS (architectural models, implementation of a modern GIS on web services, standard devices that derive data and connect components) can be implemented in the cloud, on premises, or hybrid

    3D GIS

    • 3D GIS maps illustrate objects in greater detail by adding another dimension
    • Data:
      • Feature data.
      • Surface Data (DEM - raster representation; contour -familiar ways of representing surfaces)
    • Tools: Creating contour lines, deriving new surfaces from a DEM, creating slope surfaces, creating hillshade surfaces, visibility analysis (viewshed tool) using GIS tools.

    TINs (Triangular Irregular Networks)

    • Form of vector-based digital geographic data
    • Constructed by triangulating a set of vertices (points) creating network of triangles and used for interpolation
    • GIS software supported
    • GIS can create and show different types of surface models, including:
      • Raster Data Sets
      • TIN Data Sets
      • LAS Data Sets
      • Terrain data (functional surfaces).

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    Description

    This quiz explores various methods and concepts related to change mapping in geographic contexts. It focuses on evaluating transportation policies, understanding population changes over time, and the significance of mapping discrete events. Test your knowledge on the best practices for visualizing change in geographic features.

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