# CHAPTER 9

Télécharger la présentation

## CHAPTER 9

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
##### Presentation Transcript

1. BAND TRANSFORMATIONS CHAPTER 9 Band Algebra and Vegetation Indices A. Dermanis

2. Band algebra pixeli, bandsa, b Algebraic operation Addition: A. Dermanis

3. Band algebra pixeli, bandsa, b Algebraic operation Addition: Subtraction: A. Dermanis

4. Band algebra pixeli, bandsa, b Algebraic operation Addition: Subtraction: Absolute difference: A. Dermanis

5. Band algebra pixeli, bandsa, b Algebraic operation Addition: Subtraction: Absolute difference: Multiplication: A. Dermanis

6. Band algebra pixeli, bandsa, b Algebraic operation Addition: Subtraction: Absolute difference: Multiplication: Division: A. Dermanis

7. Band algebra pixeli, bandsa, b Algebraic operation Resulting values Addition: Subtraction: Absolute difference: Multiplication: Division: A. Dermanis

8. Band algebra pixeli, bandsa, b Algebraic operation Resulting values Reduction Addition: Subtraction: Absolute difference: Multiplication: Division: A. Dermanis

9. Vegetation indices (pixel i, bands k and m) A. Dermanis

10. Vegetation indices (pixel i, bands k and m) Landsat Mutispectral Scanner vegetation A. Dermanis

11. Vegetation indices (pixel i, bands k and m) Landsat Mutispectral Scanner vegetation Thematic Mapper (ETM+) A. Dermanis

12. Vegetation indices (pixel i, bands k and m) Landsat Mutispectral Scanner vegetation Thematic Mapper (ETM+) SPOT HRV (SPOT 4 HRVIR) A. Dermanis

13. Vegetation indices (pixel i, bands k and m) Landsat Mutispectral Scanner vegetation Thematic Mapper (ETM+) SPOT HRV (SPOT 4 HRVIR) Transformed Vegetation Indices A. Dermanis

14. Original Band TM3 Original Band TM4 Example of Vegetation index: The city and nearby airport become dark, while white areas correspond to green vegetation Normalized difference vegetation index NDVI = (TM4-TM3) / ( TM4+TM3) A. Dermanis

15. Band TM3 Band TM4 Two original TM bands and the derived normalized difference vegetation index (NDVI) for a mountainous area. The mountain peak which is covered with snow appears dark, while the forest area appears close to white. Note the disappearance of the “shadow” effects caused in the original bands by varying terrain orientation NDVI = (TM4-TM3) / ( TM4+TM3) A. Dermanis