Spatial Modeler Tutorials

Tasseled Cap Transformation for Landsat 8

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Description:

The Tasseled Cap Transformation is a technique commonly used in land cover mapping or other classification projects. It takes the linear combination of satellite imagery bands and a specialized coefficient matrix to create a n-band image with the first 3 bands containing the majority of the useful information, similar to Principal Component Analysis. The first three bands created are generally held to represent Brightness, Greenness and Wetness. The coefficient matrix, which is unique to each imaging sensor, is based on image statistics and empirical observations. The matrix^[1] used in this model for the Landsat 8 OLI sensor is as follows (note that the first band of Landsat 8 OLI imagery, coastal aerosol, is effectively dropped):

	LS 8 Band 1	LS 8 Band 2	LS 8 Band 3	LS 8 Band 4	LS 8 Band 5	LS 8 Band 6	LS 8 Band 7
Brightness	0.0000	0.3029	0.2786	0.4733	0.5599	0.5080	0.1872
Greenness	0.0000	-0.2941	-0.2430	-0.5424	0.7276	0.0713	-0.1608
Wetness	0.0000	0.1511	0.1973	0.3283	0.3407	-0.7117	-0.4559
TCT4	0.0000	-0.8239	0.0849	0.4396	-0.0580	0.2013	-0.2773
TCT5	0.0000	-0.3294	0.0557	0.1056	0.1855	-0.4349	0.8085
TCT6	0.0000	0.1079	-0.9023	0.4119	0.0575	-0.0259	0.0252

Other Landsat sensors can be transformed to Tasseled Cap from the Raster tab / Resolution group / Spectral pulldown.

Assumptions: The Landsat 8 OLI imagery should have been previously corrected to at-satellite reflectance values. This greatly increases the accuracy of the tasseled-cap transform. Information on this procedure can be found here: http://landsat.usgs.gov/Landsat8_Using_Product.php

Below you can see how the resulting first 3 bands compare individually to the original image, which is displayed RGB to 4/3/2.

First Band of TCT, Brightness, compared to the original image on right:

Second Band of TCT, Greenness, compared to the original image on right::

Third Band of TCT, Wetness, compared to the original image on right::

TasseledCapLandsat8-v15-1-1.gmdx

Reference:

Coefficient matrix derived from:

Muhammad Hasan Ali Baig, Lifu Zhang, Tong Shuai & Qingxi Tong (2014)

Derivation of a tasselled cap transformation based on Landsat 8 at-satellite reflectance,
Remote Sensing Letters, 5:5, 423-431, DOI: 10.1080/2150704X.2014.915434

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Here's another relevant spatial recipe for Landsat 8 imagery from our partner Sterling Geo: "Calculate the Top of the Atmosphere Reflectance on Landsat 8 Images" found at http://www.sterlinggeo.com/spatial-modeler-library-index/ Thanks @JohnnieJ for this tip!

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Just a heads up, I was having trouble with this model, I then worked out that I needed to change the input raster type to a float rather than the default integer. My input was a float as this was the output of from the TOA conversion model (https://community.hexagongeospatial.com/t5/Spatial-Recipes/Landsat-8-Top-of-Atmosphere-Reflectance-C...)

tct input.PNG

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Thanks Lisa,

I'm not sure why the original author hardwired the Raster Input operator to set the raster steam to Integer. If your input data happens to be Reflectance values that are still in the 0 - 1 floating point range, they'll get truncated to 0s or 1s. They may have set it this way because a common practice for Reflectance data is to multiply up by 10,000 or 20,000 and truncate to 16-bit integer to save a bit of disk space. If the input had been left its default "Native" setting it should work with both Float and Integer style Reflectance inputs.

I'll fix the model tomorrow and re-post a new version to the original article.

Thanks for pointing this out!

Cheers

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Hi, sorry I can´t open the link: http://www.sterlinggeo.com/spatial-modeler-library-index/

is there another way?

TIA

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Sure - just use the Download Model link at the top of the article (you will need to be registered and logged in to do so).

Cheers

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Tasseled Cap Transformation for Landsat 8

Custom Matrix Input

Landsat 8

Linear Combination

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Tasseled Cap

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