Accuracy Assessment

Question 1

What stages can you obtain error from in image processing

Answer 1

Data acquisition(sensor/platform movement), pre-processing(geometric/radiometric correction), data conversion, error assessment(error matrix, sampling design, reporting), final products(spatial/thematic errors)
Decision implementation

Question 2

What are the forms of accuracy comparisons?

Answer 2

Overall map accuracy: look at entire map cell by cell

Site specific accuracy: using training areas and test locations

Question 3

What are the two comparison methods?

Answer 3

Error matrix: omission (unclassified omitted from their actual class), commission(incorrectly added to a class)
Summary statistics: %correct and KIA

Question 4

What is error?

Answer 4

The incorrect assignment of a pixel, will preferentially be associated with a certain class, not spatially isolated

Question 5

Compare accuracy and precision

Answer 5

Accuracy is the agreement between predicted and actual land cover and precision is the degree of detail or specificity in land cover class