Lesson 4 of 4 · Validate the decision and preserve the result
Validate the decision and preserve the result
6 minute lesson · 3 checks along the way
Your goal for this lessonCheck the reliability of a mapped classification and separate a delivered map from a demonstrated public outcome.
In this lesson 3 sections · 3 checks
Read & understand
A classification is a claim that needs checking
Taifa-1’s proposed applications included environmental monitoring and agriculture. A map intended to support those decisions should be checked against independent evidence suited to the task. Training a classification method on a set of locations and then reporting success only on those same locations can give an overly favorable impression.
Imagine a fictional water map checked at 20 independent reference locations. Ten are truly water and ten are truly non-water. The map finds 8 of the 10 water locations and incorrectly flags 2 of the 10 non-water locations. It therefore misses 2 water sites and raises 2 false alarms. These invented observations teach validation; they are not a Taifa-1 assessment.
Check 1 of 3
10 pointsUse the reading above. You can try again without losing points.
Read & understand
Different errors have different consequences
In that example, the map identifies 16 of 20 locations correctly, or 80 percent. It also detects 8 of 10 true water sites, again 80 percent. Equal percentages in this balanced example do not make the two measures interchangeable: one counts all correct classifications, while the other asks specifically how much true water was detected.
For a fictional emergency planning exercise, a missed flooded route and an unnecessary inspection have different costs. The user must decide what evidence and error rates are acceptable for the intended action. A beautiful map and a high overall percentage cannot substitute for examining the errors that matter to that user.
Inspect the errors behind an accuracy score
Original teaching diagram. Fictional independent checks; not a measurement of Taifa camera or application accuracy.
Open full-size diagram in a new tab: Inspect the errors behind an accuracy scoreCheck 2 of 3
10 pointsUse the reading above. You can try again without losing points.
Read & understand
Deliver a reproducible product and evaluate its use
An invented delivery package should include the acquisition time, sensor and source data, processing version, map projection, quality flags, cloud mask and validation report. State the intended use and the areas or conditions not assessed. Keep both the original observations and the derived map, so a later analyst can investigate a disputed boundary.
Finally, distinguish providing a map from showing that it improved a public outcome. A delivered agricultural product does not by itself establish a higher harvest or reduced losses. That requires an appropriate evaluation of how people used the information and what else affected the result. Preserving an honest mission record makes the experience useful even after the spacecraft’s flight has ended.
Check 3 of 3
10 pointsUse the reading above. You can try again without losing points.
Put it together
Your lesson progress
Each check connects to a part of the story. Complete all 3 to earn your 25-point lesson bonus.
Explore further · Optional
Go to the source
Explore the evidence behind this lesson. These optional readings and videos open in a new tab.