Atmospheric remote sensing toolkit

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BRG The University of Queensland
Fundamentals

- Main page
- Pre-processing
- Field data collection
- Mapping approaches
- Change and trends
- Delivery
  - Post classification
  - Error assessment
    - Sampling design
    - Reference data
    - Error matrix
    - Accuracy measures
    - Quantitative products
    - Interpreting accuracy
  - Final map creation

# Contingency/error matrix

Sampling results are presented in a contingency or error matrix with the following standard format:

- Reference data = columns
- Image classes = rows

| Forest | Grass land | Bare ground | Urban | Water | Row Total
Forest | 70 | 5 | 0 | 13 | 0 | 88
Grass land | 3 | 55 | 0 | 0 | 0 | 58
Bare ground | 0 | 0 | 99 | 0 | 0 | 99
Urban | 0 | 0 | 4 | 37 | 0 | 41
Water | 0 | 0 | 0 | 0 | 121 | 121
Col Total | 73 | 60 | 103 | 50 | 121 | 407

Calculations of error statistics are derived from contents of the error or contingency matrix at mapping category and map level.

- Mapping category accuracy
- Map level accuracy