Geog474 - Introduction to Environmental Remote Sensing

Image Statistics
In-Class Exercise 5

Part 1. Compute simple multivariate statistics
Band
1
2
3
4
5 
6
 7
Mean            
Standard deviation              
Variance              
Minimum              
Maximum              
Range              
Questions:
1.  Which band has lowest BV? Highest BV?  Which band exhibits the greatest range in BV?  Explain physical importance of these band differences?

2.  Which band exhibits the smallest variance and standard deviation?

Part 2. Compute covariance and correlation matrices
Covariance matrix
Bands              
               
               
               
               
               
               
               
Correlation Matrix
 
Band              
               
               
               
               
               
               
               
Questions:
3. Which bands are highly correlated?  What does this suggest about the bands that are highly correlated?
4. Which bands have low correlation?  Explain why these bands are uncorrelated?
 
Example Covariance and Correlation Matrix from Landsat TM 6 band image of Delmarva Peninsula
 


Revised October 23, 2002