Categorized Segment
Raw image
Categorized image
•This is an enlargement of a 1 square mile training segment.
•The clustering/classification is an iterative process, as fields get misclassified, they can be fixed or marked as bad for training and reprocessed.
•There are a number of tools that can be used to evaluate classification accuracy: 1) Visual inspection of all categorized training fields within an Analysis District. 2) Review of individual signatures/categories that do not perform as expected. 3) Evaluate the percent correct and confusion matrix, which shows counts of pixels by ground truth labels versus the classification’s output category number. 4) A linear regression may be run, by cover type of interest, to determine classification accuracy with respect to calculation of crop acreage.
•Once the analyst is satisfied with the classification, the next step is acreage estimation.