Conducting Accuracy Assessment in Mapping
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Questions and Answers

What is the primary challenge in producing maps?

  • Ensuring a high level of precision
  • Meeting the deadlines for map production
  • Balancing precision and accuracy (correct)
  • Achieving a high level of accuracy

    • Why is it essential to plan an accuracy assessment ahead of time?

  • To ensure the assessment is conducted quickly
  • To reduce the cost of the assessment
  • To ensure the accuracy of the map analysis (correct)
  • To ensure the assessment is conducted efficiently

    • What is the primary goal of collecting reference data?

  • To compute accuracy metrics
  • To validate the accuracy of the classified map (correct)
  • To classify the map data
  • To develop a sampling system

    • What is the key characteristic of a random sampling design?

    <p>Points are randomly distributed throughout the study area</p> Signup and view all the answers

    What is the primary benefit of using a systematic sampling design?

    <p>It provides complete and regular coverage of the study area</p> Signup and view all the answers

    What factor influences the size of the sampling locations?

    <p>The spatial resolution of the data set</p> Signup and view all the answers

    What type of error occurs when a site is classified as a reference site, but it was not actually a reference site?

    <p>Commission Error</p> Signup and view all the answers

    If an urban area has 2 incorrectly classified sites out of a total of 25 classified sites, what is the Commission Error?

    <p>8%</p> Signup and view all the answers

    What type of error occurs when a reference site is not included in the classified map?

    <p>Omission Error</p> Signup and view all the answers

    If a forest area has 10 reference sites, but 2 of them were incorrectly classified, what is the Omission Error?

    <p>20%</p> Signup and view all the answers

    What perspective does Producer’s Accuracy represent?

    <p>The mapmaker</p> Signup and view all the answers

    If a water area has 5 incorrectly classified sites out of a total of 30 classified sites, what is the Commission Error?

    <p>16%</p> Signup and view all the answers

    What is the formula to calculate the overall accuracy?

    <p>Total number of correctly classified sites / Total number of reference sites</p> Signup and view all the answers

    What is the relationship between error and accuracy?

    <p>Error + accuracy = 100%</p> Signup and view all the answers

    What type of error occurs when a reference site is left out of the correct class in the classified map?

    <p>Error of Omission</p> Signup and view all the answers

    How is the error of omission calculated?

    <p>By reviewing the reference sites for incorrect classifications</p> Signup and view all the answers

    What is the perspective of the Producer's Accuracy?

    <p>From the point of view of the mapmaker</p> Signup and view all the answers

    What happens when an error of omission occurs in one category?

    <p>It is counted as an error of commission in another category</p> Signup and view all the answers

    What is the Producer's Accuracy a measure of?

    <p>The number of correctly classified reference sites divided by the total number of reference sites</p> Signup and view all the answers

    What is the relationship between the Producer's Accuracy and the Omission Error?

    <p>The Producer's Accuracy is the difference between 100% and the Omission Error</p> Signup and view all the answers

    What is the User's Accuracy a measure of?

    <p>The reliability of the map from the user's point of view</p> Signup and view all the answers

    What is the relationship between the User's Accuracy and the Commission Error?

    <p>The User's Accuracy is the difference between 100% and the Commission Error</p> Signup and view all the answers

    If a class has a Producer's Accuracy of 80%, what is the Omission Error?

    <p>20%</p> Signup and view all the answers

    If a class has a User's Accuracy of 90%, what is the Commission Error?

    <p>10%</p> Signup and view all the answers

    What proportion of the Water reference sites were correctly identified in the classified imagery?

    <p>63.64%</p> Signup and view all the answers

    What do the off-diagonal elements of the error matrix represent?

    <p>Areas that were not classified correctly</p> Signup and view all the answers

    What is the primary benefit of calculating overall accuracy?

    <p>It provides basic information about the proportion of correctly mapped reference sites</p> Signup and view all the answers

    What is the purpose of examining the off-diagonal elements of the error matrix?

    <p>To identify areas where the most errors occurred in the classification</p> Signup and view all the answers

    How many reference sites were correctly classified out of a total of 95 sites?

    <p>74</p> Signup and view all the answers

    What is the primary purpose of the error matrix in remote sensing classification?

    <p>To improve the thematic accuracy of classification</p> Signup and view all the answers

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