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

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Presentation transcript:

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

Algebraic operation Addition: pixel i, bands a, b Band algebra A. Dermanis

Algebraic operation Addition: Subtraction: pixel i, bands a, b Band algebra A. Dermanis

Algebraic operation Addition: Subtraction: Absolute difference: pixel i, bands a, b Band algebra A. Dermanis

Algebraic operation Addition: Subtraction: Absolute difference: Multiplication: pixel i, bands a, b Band algebra A. Dermanis

Algebraic operation Addition: Subtraction: Absolute difference: Multiplication: Division: pixel i, bands a, b Band algebra A. Dermanis

Algebraic operation Addition: Subtraction: Resulting values Absolute difference: Multiplication: Division: pixel i, bands a, b Band algebra A. Dermanis

Algebraic operation Addition: Reduction Subtraction: Resulting values Absolute difference: Multiplication: Division: pixel i, bands a, b Band algebra A. Dermanis

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

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

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

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

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

Original Band TM3Original Band TM4 Normalized difference vegetation index NDVI = (TM4-TM3) / ( TM4+TM3) Example of Vegetation index: The city and nearby airport become dark, while white areas correspond to green vegetation A. Dermanis

Band TM3Band TM4 NDVI = (TM4-TM3) / ( TM4+TM3) 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 A. Dermanis