gvSIG-Desktop 1.9 Alpha. Manual de usuario.

Tasseled Cap transformation aims to detect relevant spectral characteristics of developing vegetation surface, with the main goal to detect specific culture by the use of spectral ranges of multitemporal Landsat Images.

To open the Tasseled Cap tool, you have to use the remote sensing toolbar by selecting “Raster process” from the left button and “Multispectral transformation” from the right button.

The dialog window will appear as follow.

Step by step procedure to perform the transformation

1. From the combo box, chose the image to which the transformation will be applied (1).
2. Select the bands involved in the process in (2) The number of selected bands is strictly related to the transformation type that will be applied. Thus, for MS transformation 4 bands are needed while for TM and ETM, 6 bands. In the case of the band numbers does not fit transformation needs, the user will be informed.
3. In the scroll menu choose the transformation type after having checked the Tasseled Cap checkbox. Transformation types are LandSat MS, LandSatTM and LandSat ETM+.
4. Select output options. Select if you want to save the result as a file or to keep in Memory. In the first case you will be asked to specify the destination folder and the file name before launching the operation. If you choose to keep in memory, you will be able to save it later by the option “Save as” by clicking with the right mouse button over the corresponding layer in the TOC.

Start the process by Apply or Accept.

The result is a float image with as many bands as the selected components and it will automatically load in the view as the process finishes